Tuesday, June 14, 2016

Primary Emotions

Contrary to what had been stipulated by the first behaviorism, animal organisms cannot learn just anything with the sufficient stimulating effort, for the flexibility of response is conditioned to the design of the physiological architecture. This design has an evolutionary origin, which is equivalent to say that its structure is adapted to life under certain repetitive conditions, thus, it makes sense that these reiterated processes are performed by the very same organs, and within these, by the same cellular groups. The thesis of Neural Darwinism is based on these intuitive suppositions which the physiological investigation confirms. The dynamics of the biophysical conditions, the interactions between geology and biota produce a scenario whose unstable equilibrium has forced adaptation, but only within a relatively narrow margin of possible responses, as it is shown by the devastating balance of the five massive extinctions that life on the planet has traversed. It is interesting to observe that the responses of life to each of these destructions has been very limited, in fact, it has been fundamentally the same, for life’s strategy consists on adapting its basic functions to the environment in order to be able to repeat them time and again, be this the environment of the Jurassic or that of our times. Such basic functions are, therefore, the same, and have to do with acquiring energy, with life maintenance and the ensuring of reproduction, for which different strategies will be followed that, by having been successfully repeated, will generate more complex physiological routines. Primary emotional neural systems have this simple origin, despite all the complexity of concurrence of processes that have made possible the development of life up to this point. If we expect to understand emotions, we cannot lose sight of this principle of simplicity, which is none other than the principle of organic homeostasis. Emotional neural systems can be classified in two general groups, depending on whether their functions are closer to acquiring nourishment and maintaining life or to reproduction. The first group includes the systems of self-stimulation or seeking, of aggression or rage and that of fear, and are emotions that we could call of individual range, although, rage and fear have collective repercussions. Those of the second group have a collective range, and are the sexual emotion, the maternal, the social and the ludic.
            The subcortical neural system of the vital or appetitive motivation, or of the organic self-stimulation, which could also be called emotion of seeking, is the brain function that drives the organism to investigate and control the environment for the development of its metabolic activities.[1] The system is designed to respond to new situations of the organism’s experience, focalizing the sensory-motor systems of the animal in tasks of approach, search and, in general, of exploratory actions related to new phenomena (especially if they are related to rewards), as well as to predictively respond in the future to cases of vital threat, based on the clues and information obtained from its activity. In this sense, it is a system of treatment and valuation for survival environments,[2] thus not limiting the actions of the animal to the immediate action, but on the contrary, depending on the species, it can include different activities of acquisition and gathering of subsistence means, expressed in purely automatic actions, whether those of ants or rodents who store nourishment for winter, or in pondered human economic savings plans.[3]
            The system responds unconditionally to a loss of homeostasis as well as to environmental stimuli of diverse relevance for survival, and mediates in the learning of appetitive behaviors,[4] that is, it functions as a regulator of activity, at the same time that it provides the organism’s activity with unity and coherence by participating in the formation of memories. It has been experimentally confirmed that animals become anxious, and show expectations in relation to different signs and stimuli that had been previously associated with the activation and deactivation of the system.[5] The emotion of seeking is appeased once the objective has been attained, but if it is not possible to satisfy the goal, animals will seek alternative consummations, which can partially alleviate the symptoms of an excessive appetitive activation.[6]
            If instead of understanding this system in cerebral topological terms we do it in neurochemical terms, the emotion of seeking can be characterized by a dopamine system linked to neuronal motor stimulations, a system which, as Panksepp points out, is possibly the exaptation or evolutionary functional reconversion of other more ancient neurochemical systems, based on epinephrine and norepinephrine, also responsible for the general stimulation of neurons.[7] It has been confirmed that dopamine plays a fundamental role in learning for the insect’s brain,[8] something that allows us to submerge the roots of the emotion of seeking into the oldest stages of the animal brain. When the self-stimulation system is excessively active, it can be the cause of diverse forms of cognitive errors, in which causal mechanisms may be traced where there are merely correlations.[9] In human beings, the over-activity of the dopamine system at a mesolimbic level seems to be linked to behavioral processes diagnosed as schizophrenic.[10] It is interesting to observe the link between the cognitive errors that occur due an excess of self-stimulation and magical causation. As pointed out earlier, magical causation operated under the double principle of similarity and solidarity. The latter causally linked the objects of a scenario by the mere fact of being in that scenario, analogously to what happens with the causal conceptualization of the schizophrenic. This is particularly relevant if we take into account the presence of drugs in the environments of magical causation, for the psychosis induced by stimulating drugs is analogous to schizophrenia, up to the point that we could say that it is a drug induced schizophrenia, and that, in fact, there are hallucinogenic substances, like mescaline, which have a molecular structure very similar to that of dopamine, producing a similar type of schizophrenia.[11] On the other hand, experimental evidence has been found which relates the schizophrenic processes with the neuropsychological firings that occur in the activation processes of the seeking system and REM[12] dream states, something which would link the functioning of this system with the animistic theses of Tylor, corroborating them.
            I leave for the next chapter the examination of emotions in relation to the narratives of traditional mythology, for my intention here is to give a general vision on the functionality of the emotional systems in animal behavior. However, it is interesting to highlight the connection that the emotion of seeking has with schizophrenia and the different forms of drug induced psychoses (characteristic of diverse forms of the transcendental experience), for it offers an fascinating perspective about the process of myth formation, and in particular, on the process of inspiration for their composition and on the concept of liminal mimesis already dealt with. From a neurochemical standpoint, the experience of the shaman, or that of the prophet, whether induced by drugs or by an internal imbalance in the production of neurotransmitters, is identical to the experience of a psychotic person. In fact, as James noticed, the pathological features of the religious leaders have contributed frequently to endow them with especial authority and influence over their followers.[13] An excessive stimulation of the seeking emotional system, which prompts us to activate ourselves in order to maintain the vital homeostasis, has driven us likewise –after the hallucinatory experiences of some individuals-, to establish structures of order in relation to the environment that do not have an intersubjective component, but are merely the liminal experience of a single person, or at most of a group of similar pathological persons. We encounter here a type of psychological illusion of a wider scope than the one detected by Kant in relation to pure reason. The dialectic illusion in Kantian rational psychology occurred when we confounded an idea of reason –that of a pure intelligence- with a thinking being in general,[14] by deducing from an hypostatized property of our thinking experience, a being which fulfills such property,[15] whereas the illusion produced by an excess of stimulus of the dopamine system connects by magical causation and erroneous intuitions the elements of an scenario (or several) of experience and its objects. Our biological constitution drives us to create structures of order that do not necessarily correspond with phenomena, but even once we have detected the non-correspondence, we continue to maintain them and to ground our vital objectives and our social structures on such entelechies, negating experience as a mere illusory veil that covers a deeper relation, the one provided by magical causation under the influence of dopamine. The difference with Kantian transcendental illusion is that this mythic illusion would be epistemologically avoidable, and we would not need to maintain structures based on the experiences of a group of schizophrenics. However, the efficacy of animistic and supernatural hypotheses, which have served us perfectly as regulative principles of the group and explanatory principles of the world during the better part of our development as homo sapiens, make the possible cognitive errors less relevant, because from a biological point of view, life’s goal is simply to continue living. The problems have arisen when we have tried to maintain at the same time the archaic myths and the myths of science which make possible the economic relationships of modern life.
Out of the emotional neural systems that mammals share with reptiles: seeking, rage, fear and sex, it is precisely that of seeking the one which has the most general range for the animal organism, because unlike the plant, it cannot obtain what it needs for its survival without a minimum general control of spatial movement. The search in which it is translated the behavior of a self-stimulation system, is not as much a more or less rudimentary cognitive form as the neural function upon which the general animal cognition has its ground. This neural system is activated in a threefold manner: to regulate homeostasis loses, by external stimuli, or by signs that are associated with incentives.[16] The latter implies a form of learning and adaptation, whereas the others can be seen as previous stages of this last one. In the three cases, the system activates the organism so it relates to the external world according to some physiological end, it specifies a direction for action as well as a modus operandi. In this neural system, we can observe the evolutionary process itself, from the more mechanical actions programmed in the organism, which are activated due to an homeostatic imbalance, to those conditioned by an external stimulus, or those conditioned by experience. The itinerary goes from the automatic program to anticipation, a gradation of intelligence[17] which traverses the entire emotional system.
A second emotional neural system is the one that corresponds to the phenomenon of aggression by the frustration of a physiological function or an expectation. Not every animal shows aggressive behaviors, as in the case of mollusks, for example, and not every type of aggression corresponds with activations of the same neural system. The predator is not angry with its prey, nor do the competitions for reproductive advantages -which in many cases are limited to ritual displays so that ultimately the female may decide-, have the same quality of violence than the one which arises due to a frustration in nourishment or to the defense that an animal makes of its life. Panksepp distinguishes three forms of aggression: predatory, reproductive and the one that arises due to frustration.[18] The first one is linked to the neural circuits of motivation or seeking, the second to the sexual circuits, and the third, which is due to frustration, and corresponds with what we commonly call anger or rage, is linked to a neural circuit of its own, different from the other two at the level of the stimulus, although with the possibility of being linked to them depending on the complexity of the relationships of experience.[19]
            The evolutionary advantages of an affective system that incites aggression when expectations are frustrated, or when the options of an adequate development of the metabolic functions -whether for hunger or pain in general- are directly frustrated, are obvious. In fact, the existence of types of aggression linked to other emotional systems corroborates the fundamental importance of aggression in living organisms, at the same time that it poses the question about the ability of these seven emotional systems to explain satisfactorily human and animal behavior. Could we deal better with the emotion of rage from a system that were to include the three systems that cover the different types of aggression: that of motivation, the sexual and that of aggressive frustration? A complete treatment of rage –as it also happened with the dopamine system-, requires the inclusion of the cortical forms of emotion that the human being has developed in its evolution, as well as the interactions of all the emotional neural systems in their mutual conditioning functions. However, the advantages of a previous separate treatment of each of the systems, with their own neurochemical circuits, are evident, for we count with primitive emotional functions which give us the syntax and the semantics of human and animal affections. Thus, for instance, the correct emotional sequence is not the one that leads from hunger to rage, but that which goes from the vital motivation of searching for nourishment through the frontal and temporal cortical expectation that evaluates the possibility of obtaining it, to the subsequent frustration of such an expectation, which produces rage. If rage is an emotion that entails a non-pleasurable effect for the animal, which can be deduced from the ease with which lab animals learn to disconnect by themselves the cerebral electric stimulations that produce rage in them,[20] and if the activation of this emotion implies a loss of homeostasis with a high energetic consumption for the organism, rage must be due to a general defense mechanism not limited to a specific scenario and thus producing contradictory effects; for instance, when the frustration is the consequence of an alimentary expectation, rage behavior, by consuming more energy works against the very same homeostasis that pretends to reestablish. The neural system of aggression by frustration seems to be, foremost, a general complementary defense system of flight, and similarly produces homeostatic imbalances that allow quick responses to threats to the integrity of the organism in limit situations. On the other hand, the usefulness of the joint functioning of the system of aggression with the system of seeking for learning purposes, given the non-pleasurable[21] character of rage, seems to be a sound assumption.
In these considerations on the emotion of rage or anger, we are not including a whole series of processes in which it is already at work a reasoned aggression mediated by conceptual constructions of different kinds. In fact, what has been said so far, applies both to humans and animals. In the experimental cases in which an animal has been stimulated in the system of rage, its responses have always been a direct attack against any potential danger that the animal could identify.[22] Thus, in its primitive form, this emotion is the activation of an instinctive and destructive system of self-defense whose domain is not limited to a direct vital threat, but it includes any threat that may restrict the vital capacity of the organism. Analogously to the system of self-stimulation, it specifies a direction for action and a modus operandi, and for this reason it implies a type of non-declarative, non-verbalizable, knowledge[23] -but knowledge nonetheless- at the organism’s disposal. However, unlike the system of self-stimulation, the knowledge of the organism is not grounded over this function, but instead, this second system functions as a tool which strengthens the former.
For its part, fear -like the rest of basic emotions- admits a difficult definition from our cortical or reasoning language, and we have to refer to a cerebral topology and to a specific set of neurochemical substances in order to define it. Most animals, from insects to humans, experience fear and even though not all may produce a primary consciousness associated with experience, they know how to behave like an organism with fear (or with rage), although no one has taught them how to do so, that is to say, they will exhibit certain protocols of behavior whose result is to avoid the situation in which they find themselves. Experimentation shows that in the mammal brain exists a specific neural system in which the signals of what we call anxiety and fear are processed, which can be activated through internal or external stimuli, to which it responds unconditionally, genetically or after specific experiences, presenting a collection of symptoms related to the autonomic nervous system which includes intestinal problems, diarrhea, urinary incontinence, tachycardia, dryness of mouth or an increase in respiratory rate.[24] The responses and specific stimuli that produce fear are genetically conditioned by species, according to the different evolutionary scenarios of each of them.[25] Therefore, the system of fear is programmed to respond to pain, or to different environmental stimuli which alert of danger, but it also functions as a selector of new inputs of learning (at a subcortical level) which serve to predict threats.[26] In this sense, in the same way as rage, it functions as a cognitive enhancer of the self-stimulation system, as well as a tool for social cohesion, insofar as it facilitates the formation of dominance hierarchies by reducing confrontations between rival groups.           
The second group of emotions, of a collective functional range, has reproduction as the main objective, even though the physiological conditions of reproduction propitiate different forms of cooperative relation which result in social organization, for which different emotional systems are developed. In mammals, the neural system that corresponds to the sexual emotion is different for males and females. Each one is the development of a former evolutionary system found in fish and reptiles, from whose neurochemical component, vasotocin, are derived –by the change of an amino acid- mammalian vasopressin and oxytocin.[27] Even though oxytocin and vasopressin brain circuits are the main substances that determine sexual emotions, these are only two neurochemical components of a longer list which is beginning to be elaborated in affective neuroscience, to which it would have to be added the luteinizing hormone (LH) and acetylcholine as well.[28] It is interesting to observe that in males the production of arginine-vasopressin is linked to testosterone production, and that there is a direct relationship between the production of the former and aggression.[29] This form of aggression is different from the one accompanying the production of substance P in the case of rage, and its evolutionary origin seems to obey to the competition between males for the transmission of their genes. The coordination and potentiation of the conjoined action of both systems would occur obviously only in the case in which frustration for sexual reasons may take place, which in animals seems to be limited to ritual encounters, but in humans, with the intervention of the different cognitive processes, would generate a combined and more complex type of rage, in fact something more similar to a secondary form of emotion like the one we call jealousy. The link between sexual emotion and violence does not only occur in the human terms postulated by Freud, of repression and civilization, but it is characteristic of the reproductive competition in mammals, a competition in which questions of social organization are also resolved: to ensure the continuity of the genes is a violent and competitive activity, as it is to ensure the continuity of the group’s structure. The different types of aggression are, therefore, social tools no less than individual tools, combined and directed by social emotions, whose objective is the continuity of the group. The fundamental animal bonds are those of kinship, originated by sex, and in mammals, as a consequence of the long duration of breastfeeding, they will condition the social homeostasis to longer cycles which require a more complex collective structure.
On the other hand, closely linked to the sexual emotion, we find the emotion of mother care. This emotion is genetically conditioned in the brain of every female mammal, in the sense that it has its own neural circuit in which the actions of offspring care are processed, whereas the equivalent paternal care does not enjoy a neural system of its own, but it is a learned behavior. On the other hand it must be taken into account that the brain’s gender is not simply masculine or feminine, for there is a gradation between these two poles according to the greater masculinization that the brain may have received in the uterus.[30] In this sense, we can speak of brains with a higher quantity of arginine-vasopressin circuits and of brains with a higher quantity of oxytocin circuits, being the latter better predisposed for the emotion of mother care. This emotion is present in reptiles but is much shorter and superficial, linked to egg laying, and in this case to vasotocin hormone.[31] Neuro-chemically it consists on the joint action of oxytocin, prolactin, and endorphins, thus being fundamentally a circuit of pleasure. It is interesting to notice that the emotion of mother care in the feminine brain occupies the same preoptic area as in males does the regulation of sex, that is, there is an emotional divergence upon a common neural place, implying the deficiency of a merely topological approach to the comprehension of the emotional circuits, and the need for a complementation with the functional understanding.
There is a neural circuit in which it is regulated the fundamental emotion of the social bond between mammals. Until some decades ago, behaviorist psychologists were proposing social models in which the link between members of a group proceeded from a reinforcement in experience due to the benefits in nourishment and shelter obtained through the collective medium, even though, now we know that there is a neural system localizable in the cingulate cortex, the periaqueductal area, the dorsomedial thalamus, the ventral septal area, the preoptic area and the nucleus of the stria terminalis, which is responsible for the stress and pain that animals feel when they are separated from the group.[32] This socio-organic circuit is curiously situated in the same brain areas where the sexual neural circuits and the maternal emotion are also found, and is very near as well to brain areas that are directly linked to pain processing.[33] The first coincidence shows the close neural relationship that exists between the basic emotions of sex, maternal care, and sociability, responsible –due to the characteristics of mammalian reproduction- for the forms that the collective association will take. The second coincidence points towards an evolutionary origin of this system based on other more basic systems of pain.[34]
The social emotion in its negative aspect (or of separation in relation to the group) is responsible of a type of stress that is especially intense in younger animals, a stress that disappears when the animal returns to the group or when it is injected with some sort of opioid compound.[35] At a neuro-chemical level, the positive aspect of this emotion, the experience of social bonds, is a process mediated by endorphins and oxytocin, like it occurred in the maternal emotion, playing this last neurotransmitter an active role in the formation of collective memories.[36] The phenomenon is especially relevant in relation to myths, for in them it is placed the explicit memory of a community as identity narrative. It is curious to notice that the collective memories of a group, their identity narratives are physiologically favored both in its formation and maintenance.
The last one of the emotional systems that Panksepp expounds is that of the ludic emotion. The variety of actions that we identify with the concept is one of the reasons why we still lack a good understanding of its structure, for the multiple concurrent activation of abilities that play entails hinders its isolation as a system.[37] Thus, for instance, if damage is inflicted upon the caudate nuclei and the putamen of a rodent’s brain, the animal will not only lose all desire to play, but also its appetite as well, its curiosity, and its general willingness to move,[38] that is, it will affect also the dopamine circuit of seeking. However, it is known that the parafascicular nuclei (which also participate in pain perception) and the posterior thalamic nuclei, promote ludic behavior in animals, whereas neither the neocortex nor the cingulate cortex intervene in play desire.[39] The desire for play and amusement are reduced by all kinds of corporal unbalances, hunger, sleepiness or illness, as well as by oxytocin, opioid antagonists, or the excess of these, in fact, opioid excess reduces the activity of all the emotional systems.[40] A symptom of the activation of the circuit of play is laughter (although this symptom can correspond to different n-ary emotions), a respiratory movement in humans, not learned and of sub-cortical origin, that communicates the ludic emotion, and which seems to be present as well in other mammals, like chimpanzees or dogs.[41] The emotion of play in mammals is especially important during infancy, where it starts being a kind of relationship with the mother to later become a relationship with other members of the group.[42] Play, in its most basic animal form, seems to be a way of socialization able to create intense bonds with the group, that are broader than the sexual or the maternal from which it seems to have been generated. The emotion of play communicates sociability, and is incompatible with fear and rage, generating at an individual level a parenthesis in the emotional emergencies of the first group (seeking, rage, fear), which by liberating stress operates directly upon homeostatic balance. Play can be linked to the emotion of seeking, of hunting in particular, and its cognitive dimension at a pre-cortical level seems indubitable to the extent that it trains the different organic systems for survival. In humans, the cognitive dimension of play is evident, in fact, there is a clear parallelism between calculi (logic or mathematics) and games (especially those that do not consist on a great display of physical activity), with respect to its self-contained character and the explicitation of some rules, outside of which the game ends, thus entering in the domain of other neural systems. We will revisit this emotion in more detail.
In this brief exposition of the fundamental characteristics of the primary emotions, I have separated four of them, the social, the sexual, the maternal, and the ludic, with the goal of emphasizing the link that they have in relation to collective behavior. However, the other three also show a clear social functionality. In the case of humans as it is in the case of great apes, there is no single emotion without a collective content, for our entire life is always developed within a specific social environment. The seven basic emotional systems make sense psychologically when they are interpreted as an interactive neurological set that binds behavior and the homeostasis of the organism to the social and biophysical environment. It is possible that a future understanding of the neurological processes will add another neural system to these seven here exposed, or it is even possible that the circuit of play, or some other, may not be independent from the rest. We are not dealing with axiomatic systems in which the independence of the postulates may be proved by means of mechanical processes of reasoning, moreover, the emotional processes and the behavioral responses that are derived from them can cross their field of action, as in the cases of the maternal and social emotions, or the sexual and the maternal, or the social in relation to all the others. In any case, the model of the basic emotions, or any possible substitute, will have theoretical interest insofar as it may serve to organize and interpret the psychological investigation, and above all, insofar as the emotions thus organized may be sufficient to account for the emotional life of mammals and of man. For the human case, the model of basic emotions will be sufficient if it is capable of explaining how the complex or n-ary[43] emotions are produced, even though the superior limit of the model is determined by the extension that implies the introduction of symbolization and language. The most relevant issue of this combined model of Neural Darwinism and the basic emotional systems is that it establishes a paradigm for the understanding of mammal behavior which is perfectly integrated with the cognitive models for the development of human language. The link occurs when we treat the seven neural systems like a unique emotional system, which operates as a controller of the organism’s homeostasis in relation to its environment. The joint system shows more complex properties than the neural systems in isolation, for the different neurotransmitter substances that constitute them show with respect to each other diverse relations of enablement, antagonism, and neutrality. If we add the temporal differences of the effects that they have, we will have a general framework of conditions of possibility in which we can begin to understand the n-ary emotions, formed by combination of the basic ones and by the intervention of other neocortical cognitive processes. Obviously, not all of them are combinable, nor have the same durations: the emotion of play is not compatible with that of fear, and rage does not require an activation as long as the maternal emotion. For its part, the circuit of rage produces a homeostatic imbalance that cannot be maintained by an organism safely above a relative short time span. This system has a specific functionality outside of which it is not only useless, but counterproductive. How then can we explain human emotions like hatred or revenge, in which a pattern of aggression is maintained during a much longer time span than in the case of a mere rage attack? From the concurrence of the more complex brain processes of the neocortical systems, i.e. with the inclusion of reasoning processes for emotional decision making that introduce a temporal buffer, between stimuli and responses, which does not exist in primary emotions. This temporal buffer can simply obey to the differences in tempo amongst emotions: it is postponed or anticipated based on the goals imposed by emotional programs, being in many cases expanded to trans-mundane vital scenarios, as in the case of religious emotions. The names we use for the n-ary emotions are ambiguous, and similarly as what it occurs with the names of colors, we would need to add a referent (objectual in the case of colors, and an scenario in the case of emotions) in order to make the concept of the emotion precise.[44] N-ary emotions, such as hatred, can involve different neural systems in different scenarios. There can be hatred propitiated by a rivalry in the competition for resources, or hatred unleashed by a sexual rivalry. In the first case, we would be speaking of an emotion which includes rage and seeking, besides possible emotional anticipations and delays, which are already n-ary emotions, whereas in the second case, the emotion of rage merges with that of sex, besides doing it with the corresponding anticipations and delays.
If emotions have evolutionarily determined the ever more complex behaviors that we call intelligence, they have had to harmonize the organism’s homeostatic interests in situations that include short and long terms. The emotional systems of maternity and the socio-organic unity are clearly long term biological protocols, they give a general framework for the group to which the rest have to accommodate, insofar as the life of the group is more important than that of its individual members. The experience is always of clusters of simultaneous emotions and sequences of these clusters, processes in which emotions are limited and conditioned amongst themselves, by means of the compatibilities of their action domains and the cognitive advantages that the anticipations and the delays implicate. The reprocessing of the emotional inputs from the cortical system includes tasks of selection from the working memory, remaining outside the system the inferences of competing inputs,[45] processes in which the emotional activation is modulated from the protocols of the other emotions, as well as from cognitive deliberations. Input blockings allow the deferring of responses, in the same way as the anticipations of those responses allow their processing by means of substitutive memory representations of the input. In this manner, the valuation system of the organism can become more effective for survival, at the same time that it increases the memory capacity, which allows better inductions and a wider catalogue of responses against the vital scenarios.    


[1] See the graphics on the emotional systems in Appendix C.
[2] Cf. Ikemoto, Satoshi; Panksepp, Jaak. The role of nucleus accumbens dopamine in motivated behavior: a unifying interpretation with special reference to reward-seeking. Elsevier. Brain Research Reviews 31. 1999. p.p.6-41. p.33. Web.
[3] In fact, according to the explanation of Keynes of the price of money, a main factor for the functioning of urban communities, the price of money depends as much on the marginal effectiveness of the capital as on the psychological tendency to saving. (See John M. Keynes. The General Theory of Employment, Interest and Money. Harcourt Brace Company. San Diego, New York and London. 1964. p.165.)
[4] Cf. Panksepp. Op. Cit. p.p.53-54.
[5] Ibid.
[6] See Panksepp. Op. Cit. Chapter 6: Seeking systems and anticipatory states of the nervous system. p.p.144-163.
[7] Cf. Panksepp. Ibid. p.109-110. He offers an evolutionary table of the catecholamine systems of neural activation that ranges from epinephrine, responsible for metabolic activation, and norepinephrine, responsible for sensory activation, to dopamine, responsible for motor activation.
[8] See The Role of Dopamine in Drosophila Larval Classical Olfactory Conditioning. Mareike Schelko, Dennis Pauls, Kyung-Han An, Reinhard F. Stocker, Andreas Thum. Plos-One. July 12, 2009. Web.
[9] Cf. Panksepp. Op. Cit. p.145.
[10] See Dopamine in schizophrenia: A Review and Reconceptualization. Davis, Kenneth L.; Kahn, René S.; Ko, Grant; Davidson, Michael, The American Journal of Psychiatry. Vol.148 (11), Nov 1991. p.p.1474-1486. Web. Also Guillin, Oliver; Laurelle, Marc: Neurobiology of Dopamine in Schizophrenia. Cellscience Review. Vol.2. No.2. 2005. Web.
[11] See Solomon H. Snyder. Drogas y Cerebro (Drugs and Brain). Prensa Científica. Barcelona 1992. p.p.146-159, and 208-217.
[12] Cf. Panksepp. Op. Cit. p.163.
[13] Cf. William James. The Variety of Religious Experience. Collier Books. New York. 1961. p.25. James uses as an example the personality of George Fox, founder of the Quaker religion, whose psychosis is evident in his writings.
[14] Cf. Kant, Critique of Pure Reason. B.426.
[15] From a property we deduce an extension for it, and then we specify it into a particular entity:
Ǝ Pure-Intelligence → Ǝx Pure-Intelligence X → A is Pure-Intelligence.
[16] Cf. Panksepp. Op. Cit. p.146.
[17] The finality that operates in the dopamine-catecholamine system is the same finality developed symbolically, that operates in any cognitive process, and therefore, in scientific theories, for we can characterize a physical scientific theory by its ability to explain and predict a phenomenon. To predict is a form of anticipation: in every anticipation there is a more or less rudimentary form of intelligence.
[18] To the latter he calls it affective aggression. Cf. Panksepp. Op. Cit. p.188-199.
[19] Ibid.
[20] Ibid. p.194.
[21] I will use here the notion of pleasure that neuroscience employs: any stimulus that informs the brain of the potential that such a stimulus has to return the body to its homeostatic balance. See Panksepp. Ibid. p.182.
[22] See Panksepp. Ibid. p.194.
[23] By non-declarative cognitive procedure I understand that which is linked to non-declarative or implicit memories. Non-declarative memories are information to which we do not have a conscious direct access. These memories can be of four kinds: procedural memories, memories of the perceptual system of representation, memories of classical conditioning, and the memories of non-associative learning. Procedural memory is the information about the motor and cognitive mappings, and it is processed in the basal ganglia and the cerebellum. The memory of the perceptual system of representation is the information which anticipates to the processes of perception (by means of previous mappings) and it is processed in the perceptual and associative cortex. The memory of classical conditioning is the information about the conditioned responses between two mappings, and it is processed in the motor cortex. Lastly, the memory of non-associative learning is the information about the processes of habituation and sensitization, and it is processed in the reflex pathways. See the model presented by Gazzaniga, Michael S., Ivry, Richard B., Mangun George R.; Cognitive Neuroscience. The Biology of the Mind. Ed. Cit. p.p.312-361.
[24] Cf. Panksepp. p.p.207-220.
[25] Cf. Arne Öhman, Anders Flykt and Daniel Lundqvist. Unconscious Emotion. In Cognitive Neuroscience of Emotion. Ed. Cit. p.322.
[26] Cf. Panksepp. Op. Cit. p.215.
[27] Ibid. p.230.
[28] Ibid.
[29] Ibid.
[30] Ibid. p.p.246-247. In mammals, masculinity emerges from femininity. The initially feminine brain is masculinized in the uterus due to the secretion of testosterone and its conversion into estrogens. The feminine brain protects itself from the maternal estrogens which, otherwise, would masculinize the brain. See Panksepp. Op. Cit. p.225. 
[31] Cf. Panksepp. Ibid. p.250.
[32] Ibid. p.p.262-270.
[33] Ibid. p.p.267.
[34] Ibid.
[35] Ibid. p.p.226-274.
[36] Ibid. p.p.272-273.
[37] Ibid. p.p.291.
[38] Ibid.
[39] Ibid.
[40] Ibid. p.p.293-294.
[41] Panksepp also includes rodents. Ibid. p.p.287-288.
[42] Ibid. p.281.
[43] I will call n-ary, or of n degree, to the emotions that are a mixture or a derivation of the basic emotions.
[44] Like it occurs for example with the colors, blue, green, red, grey and brown. In fact, the electromagnetic waves form a continuum which our perception reduces to a high number of discrete instances.
[45] Cf. Kevin N. Ochsner, Silvia A. Bunge, James J. Gross, John D.E. Gabrieli. Rethinking Feelings: An fMRI Study on the Cognitive Regulation of Emotion. In Social Neuroscience. Ed. Cit. p.p.253-267.

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