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An fMRI study of stimulus equivalence

Dickins, D. W., Singh, Krish Devi, Roberts, N., Burns, P., Downes, J. J., Jimmieson, P. and Bentall, R. P. 2001. An fMRI study of stimulus equivalence. Neuroreport 12 (2) , pp. 405-411.

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In order to study brain activation during the formation of equivalence relations, 12 subjects underwent fMRI during matching-to-sample (MTS) tests of (1) previously trained arbitrary relationships between iconic stimuli and the untrained, emergent relations of (2) symmetry, (3) transitivity, and (4) symmetry with transitivity, plus a test of verbal fluency (VF). Brain activation was similar in all MTS tasks and in the VF task. In particular, both types of task activated dorsolateral prefrontal cortex (DLPFC) and posterior parietal cortex bilaterally. However VF, but not the MTS tasks, activated Broca's area. In three of the four MTS tasks, behavioural accuracy was significantly correlated with left lateralisation of DLPFC activity. Brain activation patterns during equivalence thus resembled those involved in semantic processing underlying language, without involving regions concerned with the simple sub-vocal articulation of stimulus names.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Neuroscience and Mental Health Research Institute (NMHRI)
Subjects: B Philosophy. Psychology. Religion > BF Psychology
R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Uncontrolled Keywords: Broca\'s area, Dorsolateral prefrontal cortex, Emergent relations, Equivalence relations, fMRI, Matching-to-sample, Symmetry, Transitivity, Verbal fluency
Publisher: Lippincott, Williams & Wilkins
ISSN: 0959-4965
Last Modified: 04 Jun 2017 04:10

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