Journal
NEUROPSYCHOLOGIA
Volume 50, Issue 7, Pages 1372-1379Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neuropsychologia.2012.02.022
Keywords
Right hemisphere; Verbal analogy; Semantic processing; Associative relations; Categorical relations; Neuropsychological studies
Funding
- National Institutes of Neurological Disorders and Stroke (NINDS) [T32NS007413]
- National Institutes of Health [RO1 DC004817]
- National Science Foundation [SBE0541957]
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Current research on analogy processing assumes that different conceptual relations are treated similarly. However, just as words and concepts are related in distinct ways, different kinds of analogies may employ distinct types of relationships. An important distinction in how words are related is the difference between associative (dog-bone) and categorical (dog-cat) relations. To test the hypothesis that analogical mapping of different types of relations would have different neural instantiations, we tested patients with left and right hemisphere lesions on their ability to understand two types of analogies, ones expressing an associative relationship and others expressing a categorical relationship. Voxel-based lesion-symptom mapping (VLSM) and behavioral analyses revealed that associative analogies relied on a large left-lateralized language network while categorical analogies relied on both left and right hemispheres. The verbal nature of the task could account for the left hemisphere findings. We argue that categorical relations additionally rely on the right hemisphere because they are more difficult, abstract, and fragile, and contain more distant relationships. (C) 2012 Elsevier Ltd. All rights reserved.
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