Abstract
Seventy-nine patients with different cerebral lesions were trained on a visually- guided stylus maze. The main findings were: (1) bilateral hippocampal lesions produced the most severe impairment, with one patient showing no progress in 215 trials; (2) right temporal lobectomy produced a significant deficit, particularly when the underlying hippocampus was radically excised, whereas patients with left temporal-lobe lesions of equal extent, or with small parietal-lobe lesions of either hemisphere, obtained normal scores; (3) larger lesions of frontal or right posterior cortex severely impaired maze learning, suggesting that size as well as locus of cortical lesion may be a factor in maze-performance; (4) only frontal-lobe lesions affected the ability to follow test instructions.
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