A comparison of the effects of partial and total lateral frontal lesions on test performance by monkeys

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3 monkeys with sulcus principals lesions (P group), 3 with lateral frontal lesions sparing sulcus principalis (NP group), 3 with total lateral frontal lesions (T group) and 3 unoperated Ss (U group) were compared on retention of simultaneous visual discrimination and acquisition of (a) delayed alternation, (b) auditory discrimination, (c) 2 successive visual discriminations, and (d) discrimination reversal. The groups did not differ on the visual tasks. On alternation both the P and T groups were severely impaired, the T group being poorer. On auditory discrimination only the T group was markedly impaired. Alternation results lend themselves to a focus-field description. Both focus-field and mass action descriptions are consistent with the auditory discrimination findings. (15 ref.) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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