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Name: Ann-Mari Pynnonen, (Level 2 neuro-psychology essay: grade A -) Cognitive neuropsychology attempts to reveal the patterns of cognition in the brain by the means of studying patients with abnormal brain functions (Plaut, 1995). Within the field of cognitive neuropsychology the prevalent hypothesis is that brain is composed of relatively independent components, or modules, and that these subsystems perform particular functions, which can due to brain damage be selectively injured (Plaut, 1995). Alternative nonmodular theories emphasize the brain to be operating 'as a whole', like a 'uniform general purpose system' (Bechtel & Graham, 1998:p. 632). Between the debates of modularity and homogeneity, neuropsychologists have got a powerful counter argument: the occurrence of double dissociations, which are traditionally interpreted as offering strong evidence about the modularity of mind, and therefore they are the essence of theorizing in cognitive neuropsychology (Detre, 2000; Plaut, 1995). A double dissociation is manifested when patients suffer brain impairment with the...

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