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Semantic Retrieval, Mnemonic Control, and Prefrontal Cortex

Massachusetts Institute of Technology

Anthony D. Wagner

Massachusetts Institute of Technology Martinos Center for Biomedical Imaging, MGH/MIT/HMS

Accessing stored knowledge is a fundamental function of the cognitive and neural architectures of memory. Here, the authors review evidence from cognitive-behavioral paradigms, neuropsychological studies ofpatients with focal neural insult, and functional brain imaging concerning the mechanisms underlying retrieval ofsemantic knowledge and their association with prefrontal cortex. First, the authors examine behavioral and neuropsychological evidence distinguishing between controlled and automatic semantic retrieval. Then the authors review the subregions of prefrontal cortex that functional neuroimaging has associated with semantic retrieval across a range ofmemory demanding tasks. Finally, two hypotheses concerning the nature ofprocessing in these brain regions–the controlled semantic retrieval and selection hypotheses–are critically examined, and a possible synthesis is proposed.

Key Words: semantic memory • controlled retrieval • cognitive control • executive function • frontal cortex • PFC

Behavioral and Cognitive Neuroscience Reviews, Vol. 1, No. 3, 206-218 (2002)
DOI: 10.1177/1534582302001003002


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