|
cae8193
|
Evolution has no moral direction. An evolutionary understanding of human nature can explain the differing intuitions we have when we are faced with an individual rather than with a mass of people, or with people close to us rather than with those far away, but it does not justify those feelings.
|
|
evolution
morality
evolutionary-psychology
|
Peter Singer |
|
d77aed4
|
[O]ur percept is an elaborate computer model in the brain, constructed on the basis of information coming from [the environment], but transformed in the head into a form in which that information can be used. Wavelength differences in the light out there become coded as 'colour' differences in the computer model in the head. Shape and other attributes are encoded in the same kind of way, encoded into a form that is convenient to handle. The sensation of seeing is, for us, very different from the sensation of hearing, but this cannot be directly due to the physical differences between light and sound. Both light and sound are, after all, translated by the respective sense organs into the same kind of nerve impulses. It is impossible to tell, from the physical attributes of a nerve impulse, whether it is conveying information about light, about sound or about smell. The reason the sensation of seeing is so different from the sensation of hearing and the sensation of smelling is that the brain finds it convenient to use different kinds of internal model of the visual world, the world of sound and the world of smell. It is because we internally use our visual information and our sound information in different ways and for different purposes that the sensations of seeing and hearing are so different. It is not directly because of the physical differences between light and sound.
|
|
intelligence
qualia
evolutionary-psychology
consciousness
|
Richard Dawkins |
|
8822dd0
|
[T]he form that an animal's subjective experience takes will be a property of the internal computer model. That model will be designed, in evolution, for its suitability for useful internal representation, irrespective of the physical stimuli that come to it from outside. Bats and we need the same kind of internal model for representing the position of objects in three-dimensional space. The fact that bats construct their internal model with the aid of echoes, while we construct ours with the aid of light, is irrelevant.
|
|
intelligence
qualia
evolutionary-psychology
consciousness
|
Richard Dawkins |
|
3ac696e
|
The fading relevance of the nature-nurture argument has recently been revived by the rise of evolutionary psychology. A more sophisticated understanding of Darwinian evolution (survival of the fittest) has led to theories about the possible evolutionary value of some psychiatric disorders. A simplistic view would predict that all mental illnesses with a genetic component should lower survival and ought to die out. 'Inclusive fitness', however, assesses the evolutionary value of a characteristic not simply on whether it helps that individual to survive but whether it makes it more likely that their offspring will survive. Richard Dawkins's 1976 book The Selfish Gene gives convincing explanations of the evolutionary advantages of group support and altruism when individuals sacrifice themselves for others. A range of speculative hypotheses have since been proposed for the evolutionary advantage of various behaviour differences and mental illnesses. Many of these draw on ethological games-theory (i.e. the benefits of any behaviour can only be understood in the context of the behaviour of other members of the group). So depression might be seen as a safe response to 'defeat' in a hierarchical group because it makes the individual withdraw from conflict while they recover. Mania, conversely, with its expansiveness and increased sexual activity, is proposed as a response to success in a hierarchical tussle promoting the propagation of that individual's genes. Changes in behaviour that look like depression and hypomania can be clearly seen in primates as they move up and down the pecking order that dominates their lives. The habitual isolation and limited need for social contact of individuals with schizophrenia has been rather imaginatively proposed as adaptive to remote habitats with low food supplies (and also a protection against the risk of infectious diseases and epidemics). Evolutionary psychology will undoubtedly increasingly influence psychiatric thinking - many of our disorders fit poorly into a classical 'medical model'. Already it has helped establish a less either-or approach to the discussion. It is, however, a highly controversial area - not so much around mental disorders but in relation to social behaviour and particularly to gender specific behaviour. Here it is often interpreted as excusing a very male-orientated, exploitative worldview. Luckily that is someone else's battle.
|
|
mind
depression
evolutionary-psychology
the-selfish-gene
mania
mental-illness
psychiatry
|
Tom Burns |