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Ten monkeys were trained on two auditory discrimination problems of different levels of difficulty plus one visual pattern discrimination task. Bilateral conical ablations were made of either the ventral portion of the superior tem· poral gyrus to the depth of the superior temporal sulcus in the midtemporal region, or of the primary auditory projection… (More)
Cats trained to discriminate between the speech sounds [u] and [i] do not retain and are unable to relearn this discrimination after bilateral ablation of the ventral insular-temporal cortex. In control animals, retention of this ability is not affected by bilateral removal of primary auditory receiving cortex.
The first auditory recall functions have been derived for monkeys; the same animals also demonstrate perceptual abilities closely approximating those of man. An efficient, powerful psychophysical technique is used to specify and force predicted levels of difficulty of task performance across time, animals, and problems.