Olivocochlear system

![Attentional filter depths from 12 subjects who underwent a vestibular neurectomy, for the same ear (triangles) or different ears (crosses). Combined mean (----) and 95% confidence intervals are shown. An average ~15% decline in attentional filter depth can be seen following olivocochlear bundle (OCB) lesion. Data taken from Scharf et al. (1997).[26]](/uploads/202501/30/Scharfs_OCB_experiments32932.jpg)
The olivocochlear system is a component of the auditory system involved with the descending control of the cochlea. Its nerve fibres, the olivocochlear bundle (OCB), form part of the vestibulocochlear nerve (VIIIth cranial nerve, also known as the auditory-vestibular nerve), and project from the superior olivary complex in the brainstem (pons) to the cochlea.