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Copyrighted material – 9781137348005 Brief Contents Part I Historical and Methodological Issues 1 1 Historical Introduction: Evolution and Theories of Mind and Behaviour, Darwin and After 3 2 Foundations of Darwinian Psychology 17 Part II Two Pillars of the Darwinian Paradigm: Natural and Sexual Selection 33 3 Natural Selection, Inclusive Fitness and the Selfish Gene 35 4 Sex and Sexual Selection 50 Part III Human Evolution and its Consequences 69 5 The Evolution of the Hominins 71 6 This Quintessence of Dust: The Hominin Package 87 Part IV Adaptations and Developmental Plasticity 109 7 Adaptations and Evolved Design 111 8 Life History Theory 138 Part V Cognition and Emotion 163 9 Cognition and Modularity 165 10 Emotions 190 Part VI Cooperation and Conflict 203 11 Altruism and Cooperation 205 12 Conflict and Crime 229 Part VII Mating and Mate Choice 253 13 Human Sexual Behaviour: Anthropological Perspectives 255 14 Human Mate Choice: The Evolutionary Logic of Sexual Desire 268 15 Facial Attractiveness 293 16 The Paradox of Homosexuality 312 17 Incest Avoidance and the Westermarck Effect 323 Part VIII Health and Disease 339 18 Darwinian Medicine: Evolutionary Perspectives on Health and Disease 341 v Copyrighted material – 9781137348005 Copyrighted material – 9781137348005 vi BRIeF CONteNtS 19 Three Case Studies in Evolution and Health: Diet, Cancer and Mental Disorders 371 Part IX Wider Contexts 397 20 The Evolution of Culture: Genes and Memes 399 21 Ethics 418 Glossary 435 References 447 Index 484 Copyrighted material – 9781137348005 Copyrighted material – 9781137348005 Historical Introduction: Evolution and Theories CHAPTER of Mind and Behaviour, Darwin and After 1 In the distant future I see open fields for far more important researches. The origin of species 4 Psychology will be based on a new foundation, that of the necessary The study of animal behaviour: acquirement of each mental power and capacity by gradation. Light will be ethology and comparative thrown on the origin of man and his history. psychology in the 20th century 5 (Darwin, 1859b, p. 458) The rise of sociobiology and evolutionary psychology 10 Summary 14 Further reading 15 Charles Darwin published his two greatest books on inadequately informed by selectionist thought. Had evolutionary theory, On the Origin of Species by Means Freud better understood Darwin, for example, the of Natural Selection, and The Descent of Man and Selec- world would have been spared such fantastic dead-end tion in Relation to Sex, in 1859 and 1871 respectively, notions as Oedipal desires and death instincts. (Daly, and he was convinced that a revolution in psychol- 1997, p. 2) ogy would shortly follow. But for the first three- quarters of the 20th century, while biology became The project of Darwinising humanity, however, more securely based on deepening evolutionary is not just an activity taking place inside the disci- foundations, psychology failed lamentably to exploit pline of psychology: it is to be found in, and draws the potential of Darwinian thought. There were some upon, a whole range of academic fields such as ani- exceptions – William James being the most notable – mal behaviour, behavioural ecology, physical and but many psychologists either ignored Darwinism or, cultural anthropology, genetics and medicine. This more damagingly, misunderstood the message that it book takes a broad-based and catholic approach to held. Psychology was poorer as a result. this enterprise and draws upon these diverse fields Borrowing the terminology of Thomas Kuhn as required. (1962), we might say that for most of its history psy- Darwinism began in 1859 when Darwin chology has lacked a unifying paradigm – a set of (Figure 1.1), in his fiftieth year, finally published procedures, assumptions, methodologies and back- his masterwork On the Origin of Species by Means ground theories that all its practitioners can agree of Natural Selection. The book, originally intended upon. There are those who would argue that evolu- as an abstract of a much larger volume, contained tionary psychology has the potential to supply this concepts and insights that had occurred to Darwin missing paradigm, and this book is partly an attempt at least 15 years earlier, yet he had wavered and to explore the strength of this claim. This belief is delayed before publishing. The larger volume neatly summarised by the late Margo Daly: never appeared, and Darwin was forced to rush out his Origin following a remarkable series of The reason why psychologists have wandered down events that began in June of the previous year. It is so many garden paths is not that their subject is 1858, therefore, that serves as a convenient start- resistant to the scientific method, but that it has been ing point. 3 Copyrighted material – 9781137348005 Copyrighted material – 9781137348005 4 EVOlUtiON AND HUMAN BEhAViOUR 1.1 The origin of species After the Linnean meeting, Darwin set to work on what he thought would be an abstract of the great On 18 June 1858, Darwin received a letter from a volume he was working on. The abstract grew to a young naturalist called Alfred Russel Wallace, then full-length book, and his publisher, Murray, even- working on the island of Ternate in the Malay Archi- tually persuaded Darwin to drop the term ‘abstract’ pelago. When Darwin read its contents, he felt his from the title. After various corrections, the title was world fall apart. In the letter was a scientific paper in pruned to ‘On the Origin of Species by Means of the form of a long essay entitled ‘On the tendency of Natural Selection’, and Murray planned a print run varieties to depart indefinitely from the original type’. of 1,250 copies. Wallace, innocent of the irony, wondered whether Darwin, amid fits of vomiting, finished correct- Darwin thought the paper important and ‘hoped the ing the proofs on 1 October 1859. He then retired idea would be as new to him as it was to me, and that for treatment to the Ilkley Hydropathic Hotel in it would supply the missing factor to explain the ori- Yorkshire. In November, Darwin sent advance copies gin of species’ (Wallace, 1905, p. 361). The ideas were to his friends and colleagues, confessing to Wallace far from new to Darwin: they had been an obsession his fears that ‘God knows what the public will think’ of his for half a lifetime. Wallace had independently (Darwin, 1859a). Many of Darwin’s anxieties were arrived at the same conclusions that Darwin had unfounded. When the book went on sale to the trade reached at least 14 years earlier, and the demonstra- on 22 November, it was already sold out. It was an tion of which Darwin saw as his life’s work. Darwin instant sensation, and a second edition was planned knew that the essay must be published and, in a mis- for January 1860. Thereafter, man’s place in nature erable state, exacerbated by his own illness and fever was changed, and changed utterly. in the family, wrote for advice to his geologist friend and scientific colleague Sir Charles Lyell, comment- ing that he ‘never saw a more striking coincidence’ and lamented that ‘all my originality, whatever it may amount to, will be smashed’ (Darwin, 1858). Fortunately for Darwin, powerful friends arranged a compromise that would recognise the importance of Wallace’s ideas and simultaneously acknowledge Darwin’s previous work on the same subject. A joint paper, by Wallace and Darwin, was to be read out before the next gathering of the Linnean Society on 1 July 1858. The reading was greeted by a muted response. The president walked out, later complaining that the whole year had not ‘been marked by any of those striking discoveries which at once revolutionise, so to speak [our] department of science’ (Desmond and Moore, 1991, p. 470). At his home, Down House, Darwin remained in an abject state, coping with a mys- terious physical illness that plagued him for the rest of his life and nursing a nagging fear that it might seem as if he had stolen the credit from Wallace. He was also grieving: his young son Charles Waring had died a few days earlier. As the Linnean meeting proceeded, Darwin stayed away and attended the funeral with his wife Emma. By the end of the day, the theory of evolu- FiGURE 1.1 Charles Darwin (1809–82) from a tion by natural selection had received its first public photograph taken by Maull and Fox around 1854. announcement, and Darwin had buried his child. SOURCE: Public domain Wikimedia Commons. Copyrighted material – 9781137348005 Copyrighted material – 9781137348005 1 EVOlUtiON AND ThEORiEs Of MiND AND BEhAViOUR, DARwiN AND AftER 5 1.1.1 New foundations the analogy between animals and humans in both directions. Animals could be understood using con- In On the Origin, Darwin was decidedly coy about the cepts drawn from the mental life of humans, and this application of his ideas to humans, but the implica- understanding could then be reapplied to understand tions were clear enough and, in the years following, the human condition. Lorenz frequently expressed both Darwin and Thomas Huxley began the process his debt to Heinroth’s approach. of dissecting and exposing the evolutionary ancestry By conducting experiments at his home on the and descent of man. It was towards the end of On the outskirts of Vienna, Lorenz observed numerous fea- Origin, however, that Darwin made a bold forecast tures of animal behaviour that have become associ- that psychology would be placed on a new founda- ated with his name. In one classic study, he noted tion and that light would be thrown on the origin of how a newly hatched goose chick will ‘imprint’ itself man and his history (Darwin, 1859b, p.