|Cognitive modules, synaesthesia and the constitution of psychological natural kinds|
|Source: Philosophical Psychology; Mar2001, Vol. 14 Issue 1, p65-82, 18p|
|Paper - Abstract|
Fodor claims that cognitive modules can be thought of as constituting a psychological natural kind1 in virtue of their possession of most or all of nine specified properties. The challenge to this considered here comes from synaesthesia. Synaesthesia is a type of cross-modal2 association: input to one sensory modality3 reliably generates an additional sensory output that is usually generated by the input to a distinct sensory modality4. The most common form of synaesthesia manifests Fodor's nine specified properties of modularity, and hence, according to Segal (1997), it should be understood as involving an extra module. Many psychologists believe that synaesthesia involves a breakdown in modularity. After outlining how both theories can explain the manifestation of the nine alleged properties of modularity in synaesthesia, I discuss the two concepts of function which initially motivate the respective theories. I argue that only a teleological concept of function is properly able to adjudicate between the two theories. The upshot is a further application of so-called externalist considerations to mental phenomena.
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