Behavioral Auditory Function After Transection of Crossed Olivo-Cochlear Bundle in the Cat V. Pure-Tone Intensity Discrimination

Abstract

This report describes the cat's ability to discriminate pure-tone intensity differences after transaction of the crossed olivo-cochlear bundle at the floor of the fourth ventricle. Cats were trained by behavioral (avoidance) conditioning to detect intensity difference above 75 dB re 0.0002 dyne/cm² of 10000 Hz tones, using the repetitive method. Postoperative comparison of data from 5 experimental animals and 5 sham-operated control animals showed minimal differences which reflects merely functional biological variance. Neurohistological examination confirmed the accuracy of the lesion placement.