Within- and between-channel gap detection in the human auditory cortex.
We examined the neural correlates associated with a short gap between two identical pure tones (within-channel) and between two different tones (between-channel) in an odd-ball paradigm. Gap durations were selected such that a gap between identical tones was as discriminable as a gap between two different tones. Spatio-temporal dipole source modeling of electrophysiological data revealed a significant difference between standard and deviant gap stimuli, with mismatch negativity responses that were comparable in amplitude and latency for within- and between-channel conditions. Therefore, the ability to automatically register discontinuity (i.e., gap) within and between channels is comparable despite significant differences in gap size. The dipole source modeling suggests that both within- and between-gap signals are represented in or near the primary auditory cortex.
Department of Psychology, University of Toronto at Mississauga, 3359 Mississauga Rd, Mississauga, ON, L5L 1C6. aheinric@utm.utoronto.ca
Antje
A
Heinrich
Claude
C
Alain
Bruce A
BA
Schneider
D000161:Acoustic Stimulation / Q000379:methods; D000328:Adult; D000704:Analysis of Variance; D001303:Auditory Cortex / Q000502:physiology*; D001309:Auditory Threshold / Q000502:physiology*; D001931:Brain Mapping; D004307:Dose-Response Relationship, Radiation; D005072:Evoked Potentials, Auditory / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D010897:Pitch Discrimination / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology