Role of neocortex in binsural hearing in the cat. I. Contralateral masking.

Brain Research
J L Cranford

Abstract

Cats with earphones were trained with a shock avoidance procedure to detect the occurrence of 1 kHz tone pulses at one ear while continuous noise pulses were simultaneously presented to the opposite ear. For normal cats the presence of the noise produced a mean increase of 5.4 dB in the thresholds for detection of tones at the opposite ears. After large unilateral auditory cortex ablations the same cats exhibited an asymmetry between the ears in the size of the contralateral masking effect. There was a mean increase of 10.9 dB in the detection thresholds for tones at the ear contralateral to the damaged hemisphere when noise was presented to the ear opposite the intact hemisphere. Noise of the same physical intensity when presented to the ear contralateral to the damaged cortex produced no significant changes from the preoperative masking levels. Subsequent ablation of the auditory cortex of the opposite hemisphere resulted in a cancellation of the unilateral lesion effect; the cats exhibited interaurally symmetrical masking levels of the same magnitude as those observed prior to the first operation. Additional control tests indicate that the unilateral lesion effect is a central nervous system phenomenon and is specific to les...Continue Reading

References

May 1, 1975·Journal of Comparative and Physiological Psychology·J L Cranford
Aug 1, 1954·Journal of Comparative and Physiological Psychology·M R ROSENZWEIG
Feb 1, 1958·Neurology·L P SANCHEZ-LONGO, F M FORSTER
Dec 1, 1958·Proceedings of the Society for Experimental Biology and Medicine·J E DESMEDT, K MECHELSE
Sep 1, 1961·Canadian Journal of Psychology·D KIMURA

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Citations

Nov 18, 1977·Brain Research·J L Cranford, M Igarashi
Dec 7, 2007·Audiology & Neuro-otology·Franziska BiedermannRudolf Rubsamen
Feb 15, 1977·The Journal of Comparative Neurology·D W Vaughan
Apr 1, 1993·Journal of Speech and Hearing Research·J L CranfordK L Reissig

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