Reduced short-term memory span in aphasia and susceptibility to interference: contribution of material-specific maintenance deficits.
Reduced short-term memory span in aphasia and susceptibility to interference: contribution of material-specific maintenance deficits.
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DOI：
10.1016/j.neuropsychologia.2009.11.010
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发表时间：
2010-03
期刊：
影响因子：
2.6
通讯作者：
Thompson-Schill SL
中科院分区：
文献类型：
--
作者：
Barde LH;Schwartz MF;Chrysikou EG;Thompson-Schill SL
语义短时记忆（STM）缺陷传统上被定义为无法在延迟时间内保持语义表征（R.）。然而，一些患者的语义STM赤字使许多入侵的项目从以前提出的清单，从而提出了一个有趣的悖论：为什么不能保持语义表征产生增加入侵从以前的清单？在这项研究中，我们调查了20名失语症患者的维持缺陷和干扰的易感性之间的关系，其特点是弱语义或弱语音短时记忆。患者和匹配的对照组参与者进行了修改项目识别任务，旨在引起语义或语音干扰列表项目位于一个，两个或三个试验回来。控制表现出显着的影响，在这两个版本的任务的干扰。干扰患者的STM赤字的类型和严重程度进行预测，即，较短的语义跨度与更大的语义干扰和较短的语音跨度与更大的语音干扰。我们解释这些结果，通过一个新的视角，激活假说，我们讨论了他们的重要性，强调的贡献，STM损伤失语症的维护机制，以及干扰的敏感性帐户。
Semantic short-term memory (STM) deficits have been traditionally defined as an inability to maintain semantic representations over a delay (R.). 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. 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 perspective, the reactivation hypothesis, and we discuss their importance for accounts emphasizing the contribution of maintenance mechanisms for STM impairments in aphasia as well as susceptibility to interference.
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DOI：
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发表时间：
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