Functional Aspects of Emotions in Fish

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Functional Aspects of Emotions in Fish Behavioural Processes 100 (2013) 153–159 Contents lists available at ScienceDirect Behavioural Processes jou rnal homepage: www.elsevier.com/locate/behavproc Functional aspects of emotions in fish ∗ Silje Kittilsen Norwegian School of Veterinary Science, Norway a r t i c l e i n f o a b s t r a c t Article history: There is an ongoing scientific discussion on whether fish have emotions, and if so how they experience Received 19 March 2013 them? The discussion has incorporated important areas such as brain anatomy and function, physiological Received in revised form and behavioural responses, and the cognitive abilities that fish possess. Little attention has however, been 10 September 2013 directed towards what functional aspects emotions ought to have in fish. If fish have emotions – why? Accepted 11 September 2013 The elucidation of this question and an assessment of the scientific evidences of emotions in fish in an evolutionary and functional framework would represent a valuable contribution in the discussion on Keywords: whether fish are emotional creatures. Here parts of the vast amount of literature from both biology and Emotions Behaviour psychology relating to the scientific field of emotions, animal emotion, and the functional aspects that Cognition emotions fulfil in the lives of humans and animals are reviewed. Subsequently, by viewing fish behaviour, Psychology physiology and cognitive abilities in the light of this functional framework it is possible to infer what Fish functions emotions may serve in fish. This approach may contribute to the vital running discussion on Evolution the subject of emotions in fish. In fact, if it can be substantiated that emotions are likely to serve a function in fish similar to that of other higher vertebrate species, the notion that fish do have emotions will be strengthened. © 2013 Elsevier B.V. All rights reserved. Contents 1. Historical development – human thinking of animal emotion . 154 1.1. The science of emotion . 154 1.2. Traditions within the science of emotion . 154 1.3. Classification of emotions . 155 2. Functional aspects of emotions . 155 3. Measure animal emotion . 156 4. Emotional premises in fish? . 156 4.1. Fish brain anatomy and physiological responses . 157 4.2. Behavioural responses and cognitive abilities in fish . 157 4.2.1. Fear and pain . 157 4.2.2. Positive emotions . 157 4.3. Consciousness and cognitive complexity in fish . 157 4.4. Communication and social bonding in fish? . 158 5. Do fish have emotions? . 158 Acknowledgement . 158 References . 159 ∗ Correspondence to: Institute of Basal Sciences and Aquatic Medicine, Norwegian School of Veterinary Science, PO 8146 Dep., 0033 Oslo, Norway. Tel.: +47 41515973; fax: +47 22964535. E-mail address: silje [email protected] 0376-6357/$ – see front matter © 2013 Elsevier B.V. All rights reserved. http://dx.doi.org/10.1016/j.beproc.2013.09.002 154 S. Kittilsen / Behavioural Processes 100 (2013) 153–159 1. Historical development – human thinking of animal emotion ‘Pleasures and pains’ or emotions have played a key role in human thinking about animal behaviour throughout the history. Aristotle (384 BC–322 BC) wrote in his book ‘History of Animals’ that ‘all animals pursue pleasure in keeping with their nature’. The French 17th century philosopher René Descartes has often been blamed for the view that animals are without feelings, but did in fact write about fear, hope and joy as motivating the behaviour of animals (Fraser and Duncan, 1998). Jeremy Bentham, the well known English philosopher and lawyer was one of our first propo- nents of animal rights. He emphasized that the ability to experience ‘pleasures and pains’ should be the only criterion essential to hold or deserve an inherent moral status. Bentham is much quoted in animal rights and animal welfare for stating. ‘The question is not can they reason? Nor can they talk? But can they suffer?’ Bentham’s pleasures included those derived from satisfying hunger and thirst, from sexual experiences, from health and from gratifying curiosity. His pains covered feelings arising from disappointment, hunger, thirst, disease or experiencing excessive heat and cold (Bentham, 1823). Thirty years later Herbert Spencer (1855) put these ideas into a more biological context by proposing that feelings are adapta- tions. He believed that feelings combined with memory and reason allowed an animal to substitute flexible, adaptive reactions for merely reflexive ones. Nevertheless, the perhaps most influential publication on animal emotion came in 1872 with Charles Darwin’s. ‘The expression of emotions in man and animals’, which will be addressed shortly. 1.1. The science of emotion The science of emotions has been termed both contradictory and confusing. Many models and theories exist, partly because researchers have focused on different components of the emotional reaction such as expressions, behaviour or physiology. A major problem in the field of emotion has been the wide variety of defini- Fig. 1. Drawings depicting emotional expressions in man and dog published in tions that have been proposed. In an attempt to resolve the resulting Charles Darwin’s book ‘The expression of emotions in man and animals’ (1872). confusion, 92 definitions were in 1981 compiled from a variety of sources in the literature of emotion. These definitions were clas- sified into 11 different categories, on the basis of the emotional phenomena or theoretical issues emphasized in the various defini- contributed with important developments in the understanding tions (Kleinginna and Kleinginna, 1981). This certainly illustrates of emotions. From an evolutionary perspective Charles Darwin’s the complexity of the concept of emotions. publication ‘The expression of emotions in man and animals’ can In the present article two examples of how an emotion can be be seen as a cornerstone of modern emotion research. The gen- defined are included. These are two quite recent definitions that eral impact of this publication was that behaviours were seen as do operate on different levels but still indicate something essen- functional properties of species that played a significant role in tial about emotions. The American psychologist and professor of adaptation. Furthermore, emotions were no longer seen as dysfunc- medicine Robert Pluchik, stated that an emotion is not simply a feel- tional, in the sense as something to reject or control, but instead ing state. An emotion is a complex chain of events that begins with as something being functional and ultimately essential for sur- a stimulus and includes feelings, psychological changes, impulses vival (Scherer et al., 2001). Darwin also put much emphasis on the to action and specific, goal-directed behaviour (Plutchik, 2001). A social and communicative function of emotions as illustrated by the somewhat simpler but elegant definition was proposed by neuro- several drawings depicting animals and human faces experiencing scientist Jaak Panksepp who defines emotions as ‘processes which different emotions (Fig. 1). Subsequently, in the wake of Darwin’s are likely to have evolved from basic mechanisms that gave ani- theory of evolution, it became common to view emotions and other mals the ability to avoid harm or punishments and to seek valuable mental states of animals including humans as adaptive products of resources or reward’ (Panksepp, 1998). It is worth noting that both natural selection. definitions emphasize goal-directed behaviour and thus the ulti- In the late 19th century a psycho-physiological perspective on mate and adaptive nature of emotions, while the first also includes emotions was at the centre of attention. Emotions were looked proximate aspects. upon as part of a chain with multiple events that prepared the organism for potential action and provided the individual with 1.2. Traditions within the science of emotion information regarding the meaning of the current state of the envi- ronment (Scherer et al., 2001). A question that received quite a deal Different scientific traditions such as the evolutionary, of attention is what happens first, the emotion or the physiological the psycho-physiological and the cognitive perspective have arousal? S. Kittilsen / Behavioural Processes 100 (2013) 153–159 155 Encountered a frightening stimulus, psychologist William arousal James, believed that peripheral physiological activation in the body high fearfu l took place first and then was accompanied by the emotion fear; ‘We excited feel afraid because we tremble’ (James, 1890). This view of emotion is known as the James–Lange theory. The Cannon–Bard theory on the other hand argues that the emotion arises first in the central nervous system and that the emotion is responsible for initiating the physiological responses. In fact the question was more nuanced, - + the core difference between Cannon and James boiled down to valence whether the experience of emotion does or does not require the perception of physiological bodily changes. In fact, this debate has not ended yet (Scherer et al., 2001). Contrary to some popular notions, emotions do not generally sad content ‘get in the way’ of rational thinking, emotions are in fact essential to low rationality. In the1960s several influential researchers introduced the cognitive aspect into the science of emotion. Schachter and Fig. 2. Emotions portrayed on two dimensions, one representing the degree of Singer (1962) included cognition in their ‘two-factor theory of emo- arousal, the other the valence of the emotion. Modified from Russell (1980). tion’. According to this theory cognition were used to interpret the meaning of a physiological activation and also the emotion that Others have classified emotions as separated and specific states aroused (Schachter and Singer, 1962). Cognition has later been with behavioural and physiological correlates (e.g. Ekman, 1992; defined as ‘the mechanism by which animals acquire, process, Plutchik, 2001). This view supports a small number of basic or store and act on information from the environment’ (Shettleworth, 2001). primary emotions such as for example fear, happiness, sadness, disgust and anger.
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