PMID: 11514250Aug 22, 2001

Transcranial magnetic stimulation of left prefrontal cortex impairs working memory

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
B R Mull, M Seyal

Abstract

Several lines of evidence suggest that the prefrontal cortex is involved in working memory. Our goal was to determine whether transient functional disruption of the dorsolateral prefrontal cortex (DLPFC) would impair performance in a sequential-letter working memory task. Subjects were shown sequences of letters and asked to state whether the letter just displayed was the same as the one presented 3-back. Single-pulse transcranial magnetic stimulation (TMS) was applied over the DLPFC between letter presentations. TMS applied over the left DLPFC resulted in increased errors relative to no TMS controls. TMS over the right DLPFC did not alter working memory performance. Our results indicate that the left prefrontal cortex has a crucial role in at least one type of working memory.

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Related Concepts

Hemispheric Specialization
Electric Stimulation Technique
Memory
Prefrontal Cortex
Transcranial Magnetic Stimulation, Single Pulse

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