期刊
COGNITIVE AFFECTIVE & BEHAVIORAL NEUROSCIENCE
卷 14, 期 2, 页码 792-804出版社
SPRINGER
DOI: 10.3758/s13415-013-0219-x
关键词
Working memory; PTSD; ERP; Dual task; Executive function; Sternberg memory task
资金
- U.S. Army Medical Research and Materiel Command [W81XWH-08-2-0086]
- VA Merit Review grant from the Clinical Science Research and Development Service
Patients with posttraumatic stress disorder (PTSD) can show declines in working memory. A dual-task design was used to determine whether these impairments are linked to executive control limitations. Participants performed a Sternberg memory task with either one or four letters. In the dual-task condition, the maintenance period was filled with an arrow flanker task. PTSD patients were less accurate on the working memory task than were controls, especially in the dual-task condition. In the single-task condition, both groups showed similar patterns of brain potentials from 300 to 500 ms when discriminating old and new probes. However, when taxed with an additional task, the event-related potentials (ERPs) of the PTSD group no longer differentiated old and new probes. In contrast, interference resolution processes in both the single- and dual-task conditions of the flanker task were intact. The lack of differentiation in the ERPs reflects impaired working memory performance under more difficult, dual-task conditions. Exacerbated difficulty in performing a working memory task with concurrent task demands suggests a specific limitation in executive control resources in PTSD.
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