Frequency changes in a continuous tone : Auditory cortical potentials

摘要: Objective: We examined auditory cortical potentials in normal hearing subjects to spectral changes continuous low and high frequency pure tones. Methods: Cortical were recorded increments of from 250 or 4000 Hz The magnitude change was random varied 0% 50% above the base frequency. Results: Potentials consisted N100, P200 a slow negative wave (SN). N100 amplitude, latency dipole with significantly greater for compared frequencies. Dipole amplitudes right than left hemisphere both SN amplitude between 4% not related change. Conclusions: Modulation elicited by is more pronounced Significance: These data provide electrophysiological evidence that central processing cortex differs Some these differences may be temporal- spectral-based coding at periphery. Central representation different temporal windows integration across