Dr. Dan Bosnyak
McMaster University

Plasticity and the effects of attention on responses evoked from auditory cortex.

Several components of evoked auditory potentials and magnetic fields have been reported to be enhanced by musical training and by laboratory discrimination training.  The P2 component, believed to originate in secondary auditory cortex, is highly plastic, and enhanced both in trained musicians and by a variety of acoustic discrimination tasks. Attention is assumed to have a gating effect on neural plasticity possibly via cholinergic projections from the basal forebrain and from prefrontal cortex that modulate synaptic plasticity by making neurons more sensitive to their afferent inputs.  I will discuss several experiments that measure evoked auditory reponses whose results might further our understanding of the rules that guide auditory remodelling and its expression in auditory evoked potentials and magnetic fields.