Brain, Vol. 107, No. 2, 605-617, 1984
© 1984 Oxford University Press
research-article |
DISTURBANCES OF LONG-TERM MEMORY IN APHASIC PATIENTS
A COMPARISON OF ANTERIOR AND POSTERIOR LESIONS
The Department of Neurology, Hennepin County Medical Center Minneapolis, Minnesota, USA
Correspondence to:
Correspondense to: Gail L. Risse, Neurobehaviour-Aphasia Unit AB823, Hennepin Country Medical Center, 701 park Avenue South, Minneapolis, MN 55415.
The performance of 20 aphasic patients on a verbal list-learning task was examined in relation to site of lesion, as documented by CT scan. Patients with lesions of the inferior frontal lobe and/or the basal ganglia were severely impaired in both acquisition and long-term retention of the list, while the performance of patients with posterior temporoparietal involvement was nearly normal. These results contrasted sharply with scores on short-term memory tests by the same patient groups which showed an opposite trend. The findings support a functional and neuroanatomical dissociation of short and long-term memory systems and suggest that neural connections of the inferior frontal lobe and the basal ganglia may be crucial for initiating the retrieval process.
Received February 22, 1983.
Revised October 24, 1983.
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