Many of the symptoms reported by Klüver and Bucy1 in monkeys after bilateral temporal lobectomy concern changes of visually guided behavior. One aspect of these visual anomalies is the failure to retain preoperatively learned visual discriminations.2,3 This detrimental effect is localized in the middle and inferior temporal gyri.3,4 Attempts to analyze the nature of this defect show that the memory traces of these habits, the animal's general working attitude, and its visual attentiveness are not disturbed.5-7 Furthermore, there is indication that such temporal neocortical ablations have little effect on an overlearned visual discrimination, i. e., when many additional trials of the discrimination are given to the animal after the usual criterion of learning is reached.15 Recently, clinical studies have reported that in human patients destruction of medial temporal region abolished only recent, but not old, memories.8,9 Experimental studies on such a comparable effect as
CHOW KL, SURVIS J. Retention of Overlearned Visual Habit After Temporal Cortical Ablation in Monkey. AMA Arch NeurPsych. 1958;79(6):640–646. doi:10.1001/archneurpsyc.1958.02340060036004
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