The method of positron emission tomography illustrates the circular logic popular in subtractive neuroimaging and linear reductive cognitive psychology. Both require that strictly feed-forward, modular, cognitive components exist, before the fact, to justify the inference of particular components from images after the fact. Also, both require a "true" componential theory of cognition and laboratory tasks, before the fact, to guarantee reliable choices for subtractive contrasts. None of these possibilities are likely. Consequently, linear reductive analysis has failed to yield general, reliable, (...) componential accounts. (shrink)

The field of cognitive imaging is explodingboth in terms of the amount of our scientificresources dedicated to it and the associatedpublication rate. However, all of this effortis based on a critical question – Do cognitivemodules exist? Both of the reviewers of my book(Uttal, 2001) and I agree that this questionhas not yet been satisfactorily answered and,depending on the ultimate answer, the cognitiveimaging approach as well as some other parts ofthe quest for mechanistic models of mind mightnot be successful. Our views (...) of how our scienceshould respond to this serious problem,however, are quite different. Both ProfessorBechtel and Lloyd argue for an optimisticattack on the problem of the localization ofcognitive processes in the brain based on thehistory of other sciences. I argue that arealistic appreciation of the limits of thisapproach should temper the enthusiasm for whatultimately will go the way of other attempts tounravel the mind-brain problem. (shrink)

This paper defends cognitive neuroscience’s project of developing mechanistic explan- ations of cognitive processes through decomposition and localization against objections raised by William Uttal in The New Phrenology. The key issue between Uttal and researchers pursuing cognitive neuroscience is that Uttal bets against the possibility of decomposing mental operations into component elementary operations which are localized in distinct brain regions. The paper argues that it is through advancing and revising what are likely to be overly simplistic and incorrect decompositions that (...) the goals of cognitive neuroscience are likely to be achieved. (shrink)