To evolve means to change with time. In Psychology, the theory of evolution has been used to explain how the human mind and behaviour have changed over millions of years so that they are adapted to the demands of our individual environments.
The notion of adaptiveness is based on Darwin’s theory of natural selection. This is the idea that any genetically determined behaviour that enhances an individual’s chance of survival and reproduction will be naturally selected (the genes will be passed onto the next generation). An example of this is altruistic behaviour where parents risk their lives to save their offspring. The theory of natural selection would say that altruism is an inherited, adaptive trait because saving an offspring enhances the survival of that individual’s gene pool.
One of the key concepts of the evolutionary approach is the environment of evolutionary adaptiveness (EEA). This is the environment to which any species is adapted and the selective pressures that existed at that time. Evolutionary psychologists do not assume that all forms of behaviour are adaptive – only the ones that ensure survival. Example:
EEA can explain why humans have such large brains relative to their body size. This theory would propose that the human brain has evolved in response to the complex social organisation of our species.
Comments
No comments have yet been made