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Conference Paper: Dissociation of verbal and nonverbal memory: A meta-analysis

TitleDissociation of verbal and nonverbal memory: A meta-analysis
Authors
Issue Date2000
PublisherBlackwell Publishing, Inc. The Journal's web site is located at http://www.blackwellpublishing.com/journals/EPI
Citation
Epilepsia, v. 41 suppl. 7, p. 157-158, abstract 2.265 How to Cite?
AbstractRATIONALE: Dissociations of both verbal and nonverbal memory in epileptic patients after temporal lobectomy have remained controversial. While some studies have found that such dissociations exist, others have found otherwise. The purpose of this study is to identify the overall consistency of these research findings and to what extent these findings support the presence of memory dissociations. METHODS: A meta-analysis was performed by reviewing an initial set of 54 articles on memory in temporal lobe epilepsy. Articles were excluded it they were characterized by one of the following: (1) absence of verbal or nonverbal measure, or both, (2) did not report usable statistics for meta-analytic techniques, (3) no explicit mentioning of cerebral dominance, (4) non-complimentarity of verbal and nonverbal measures, and (5) did not employ Weschler Memory Scale (WMS) as a primary memory measure. Five studies that qualified for subsequent analyses had left cerebral dominance (mostly right-handers). Logical memory (LM) and Visual Reproduction (VR) subscales of WMS indicated verbal and nonverbal memory respectively. Differences were calculated on both LM and VR between left- (LTL) and right temporal lobectomized (RTL) patients, as well as between pre- and post-lobectomy. RESULTS: Differences between LTL and RTL were found in both preand post-lobectomy. RTL had better scores than LTL on both immediate and delayed recall of LM and VR, with the exception of immediate recall on VR. In terms of within-subject differences from pre- to post-lobectomy, for both immediate and delayed recall, LTL had decreased LM, with an increase in VR. In contrast, RTL had an increased immediate and delayed recall on LM, but only a decrease in delayed recall on VR post-lobectomy. RTL had an increase in immediate recall on VR, though the effect size was neglible. CONCLUSIONS: The present findings support the presence of a double dissociation, though this pattern was more apparent for delayed than immediate recall on LM and VR. The possible presence of verbal components in nonverbal measures of memory may have rendered less apparent findings for nonverbal memory in this study.
DescriptionThis free journal suppl. entitled: American Epilepsy Society Proceedings
Persistent Identifierhttp://hdl.handle.net/10722/109845
ISSN
2015 Impact Factor: 4.706
2015 SCImago Journal Rankings: 2.579

 

DC FieldValueLanguage
dc.contributor.authorLee, TMCen_HK
dc.contributor.authorYip, JTHen_HK
dc.date.accessioned2010-09-26T01:39:49Z-
dc.date.available2010-09-26T01:39:49Z-
dc.date.issued2000en_HK
dc.identifier.citationEpilepsia, v. 41 suppl. 7, p. 157-158, abstract 2.265en_HK
dc.identifier.issn0013-9580en_HK
dc.identifier.urihttp://hdl.handle.net/10722/109845-
dc.descriptionThis free journal suppl. entitled: American Epilepsy Society Proceedings-
dc.description.abstractRATIONALE: Dissociations of both verbal and nonverbal memory in epileptic patients after temporal lobectomy have remained controversial. While some studies have found that such dissociations exist, others have found otherwise. The purpose of this study is to identify the overall consistency of these research findings and to what extent these findings support the presence of memory dissociations. METHODS: A meta-analysis was performed by reviewing an initial set of 54 articles on memory in temporal lobe epilepsy. Articles were excluded it they were characterized by one of the following: (1) absence of verbal or nonverbal measure, or both, (2) did not report usable statistics for meta-analytic techniques, (3) no explicit mentioning of cerebral dominance, (4) non-complimentarity of verbal and nonverbal measures, and (5) did not employ Weschler Memory Scale (WMS) as a primary memory measure. Five studies that qualified for subsequent analyses had left cerebral dominance (mostly right-handers). Logical memory (LM) and Visual Reproduction (VR) subscales of WMS indicated verbal and nonverbal memory respectively. Differences were calculated on both LM and VR between left- (LTL) and right temporal lobectomized (RTL) patients, as well as between pre- and post-lobectomy. RESULTS: Differences between LTL and RTL were found in both preand post-lobectomy. RTL had better scores than LTL on both immediate and delayed recall of LM and VR, with the exception of immediate recall on VR. In terms of within-subject differences from pre- to post-lobectomy, for both immediate and delayed recall, LTL had decreased LM, with an increase in VR. In contrast, RTL had an increased immediate and delayed recall on LM, but only a decrease in delayed recall on VR post-lobectomy. RTL had an increase in immediate recall on VR, though the effect size was neglible. CONCLUSIONS: The present findings support the presence of a double dissociation, though this pattern was more apparent for delayed than immediate recall on LM and VR. The possible presence of verbal components in nonverbal measures of memory may have rendered less apparent findings for nonverbal memory in this study.-
dc.languageengen_HK
dc.publisherBlackwell Publishing, Inc. The Journal's web site is located at http://www.blackwellpublishing.com/journals/EPIen_HK
dc.relation.ispartofEpilepsiaen_HK
dc.titleDissociation of verbal and nonverbal memory: A meta-analysisen_HK
dc.typeConference_Paperen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0013-9580&volume=41&spage=157&epage=158&date=2000&atitle=Dissociation+of+verbal+and+nonverbal+memory:+A+meta-analysisen_HK
dc.identifier.emailLee, TMC: tmclee@hkusua.hku.hken_HK
dc.identifier.authorityLee, TMC=rp00564en_HK
dc.description.naturelink_to_OA_fulltext-
dc.identifier.doi10.1111/j.1528-1157.2000.tb01727.x-
dc.identifier.hkuros63342en_HK
dc.identifier.volume41en_HK
dc.identifier.issuesuppl. 7-
dc.identifier.spage157, abstract 2.265en_HK
dc.identifier.epage158en_HK
dc.identifier.epage158-

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