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| Research article summary (published 29 Apr 2003): |
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Source versus content memory in patients with a unilateral frontal cortex or a temporal lobe excision.
Full Abstract
It has been suggested previously that patients with a frontal lobe lesion might have a specific impairment in the retrieval of the source of information despite adequate memory for facts. Patients with an anterior temporal excision are known to have impairments in memory for facts and the question arises as to whether they are also impaired in source memory. The present study compared memory for facts and their source in patients with a unilateral frontal cortical or an anterior temporal excision in a situation in which both types of information were encoded explicitly. Patients with a unilateral frontal cortex or a temporal lobe excision watched videos of a game show and were instructed to attend to both the trivia facts and their source (the identity of the speaker or the relative time of presentation). Patients with a frontal cortex excision were not impaired on either fact or source memory. This was true even when a subgroup of patients with an excision involving the dorsolateral frontal cortex was examined. In contrast, patients with a left temporal lobe excision were impaired in both fact and identity source memory and right temporal lobe patients were impaired in identity source memory. All patients performed similarly to normal controls in temporal source memory. The present results are consistent with the view that source information is part of an associative network of information about an episode and that the medial temporal region is critical for both source and content memory. Furthermore, if source information is encoded explicitly, the frontal cortex does not appear to be necessary for its retrieval. Instead, it is proposed that the frontal cortex plays a metacognitive role in memory retrieval.
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Author information
Author/s: Thaiss, Laila (L); Petrides, Michael (M);
Affiliation: Victoria General Hospital, Victoria, British Columbia, Canada. laila.thaiss(-atsign-)mail.mcgill.ca
Journal and publication information
Publication Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't
Journal: Brain : a journal of neurology (Brain), published in England. (Language: eng)
Reference: 2003-May; vol 126 (issue Pt 5) : pp 1112-26
Dates: Created 2003/04/11; Completed 2003/07/18; Revised 2006/11/15;
PMID: 12690051, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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