by exploited » Thu Oct 17, 2013 9:27 am
Evolutionary psychologists have postulated that the mind is composed of cognitive modules specialized to perform specific tasks. Evolutionary psychologists have theorized that these specialized modules enabled our ancestors to react quickly and effectively to environmental challenges. As a result, domain-specific modules would have been selected for whereas broad general-purpose cognitive mechanisms that worked more slowly would have been eliminated in the course of evolution.[14][15]
A number of cognitive scientists have criticized the modularity hypothesis, citing growing neurological evidence of brain plasticity and changes in neural networks in response to environmental stimuli and personal experiences.[14][15] Steven Quartz and Terry Sejnowski, for example, have argued that the view of the brain as a collection of specialized circuits, each chosen by natural selection and built according to a "genetic blueprint", is contradicted by evidence that cortical development is flexible and that areas of the brain can take on different functions.[16] Neurobiological research does not support the assumption by evolutionary psychologists that higher-level systems in the neocortex responsible for complex functions are massively modular.[17][18] Peters (2013) cites neurological research showing that higher-order neocortical areas can become functionally specialized by way of synaptic plasticity and the experience-dependent changes that take place at the synapse during learning and memory. As a result of experience and learning processes the developed brain can look modular although it is not necessarily innately modular as suggested by evolutionary psychologists.[17]
Another criticism is that there is little empirical support in favor of the domain-specific theory beyond performance on the Wason selection task.[19][20] Leading evolutionary psychologists Leda Cosmides and John Tooby have found that performance on the selection task is content-dependent: People find it easier to detect violations of "if-then” rules when the rules can be interpreted as cheating on a social contract. From this Cosmides and Tooby and other evolutionary psychologists concluded that the mind consisted of domain-specific, context-sensitive modules (including a cheater-detection module).[20] Critics have suggested that Cosmides and Tooby use untested evolutionary assumptions to eliminate rival reasoning theories and that their conclusions contain inferential errors.[20][21] Davies et al., for example, have argued that Cosmides and Tooby did not succeed in eliminating the general-purpose theory because the adapted Wason selection task they used tested only one specific aspect of deductive reasoning and failed to examine other general-purpose reasoning mechanisms (e.g., reasoning based on syllogistic logic, predicate logic, modal logic, and inductive logic etc.).[20] Furthermore, Cosmides and Tooby use rules that incorrectly represent genuine social exchange situations. Specifically, they posit that someone who received a benefit and does not pay the cost is cheating. However, in real-life social exchange situations people can benefit and not pay without cheating (as in the case of receiving gifts or benefiting from charity).[20]