In this chapter, 1 have provided several examples of how measurements can be combined via models to yield results that are more informative and reliable than the original measurements themselves. This technique must always be accompanied by rigorous model evaluation, lest the interpretation of the parameters be misled by incorrect assumptions about their relation to one another. These same techniques apply to measurements obtained from physiological properties of the brain; doing so will allow the burgeoning field of cognitive neuroscience to accommodate more readily to the theories of cognitive psychology. Finally, model-based interpretations provide a particularly useful way of seeking dissociations that are the fundamental building blocks of cognitive systems. A dissociation may only become evident when the correct model is imposed on the data. These dissociations should not be taken to imply dissociations at the level of the brain, nor should different brain systems necessarily influence cognitive theorizing.

Chapter 2 5

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