Reduced short-term memory span in aphasia and susceptibility to interference: contribution of material-specific maintenance deficits.

Neuropsychologia
Laura H F BardeSharon L Thompson-Schill

Abstract

Semantic short-term memory (STM) deficits have been traditionally defined as an inability to maintain semantic representations over a delay (Martin et al., 1994b). Yet some patients with semantic STM deficits make numerous intrusions of items from previously presented lists, thus presenting an interesting paradox: why should an inability to maintain semantic representations produce an increase in intrusions from earlier lists? In this study, we investigated the relationship between maintenance deficits and susceptibility to interference in a group of 20 aphasic patients characterized with weak semantic or weak phonological STM. Patients and matched control participants performed a modified item-recognition task designed to elicit semantic or phonological interference from list items located one, two, or three trials back (Hamilton & Martin, 2007). Controls demonstrated significant effects of interference in both versions of the task. Interference in patients was predicted by the type and severity of their STM deficit; that is, shorter semantic spans were associated with greater semantic interference and shorter phonological spans were associated with greater phonological interference. We interpret these results through a new pe...Continue Reading

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Citations

Aug 26, 2011·Cognitive Neuropsychology·Rebecca M Scott, Carolyn E Wilshire
Mar 26, 2013·The Quarterly Journal of Experimental Psychology : QJEP·Eva Belke, Anna Stielow
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Mar 15, 2014·Neuropsychological Rehabilitation·Lara HarrisGlyn Humphreys
May 22, 2019·Journal of Speech, Language, and Hearing Research : JSLHR·Grace ManJiyeon Lee

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