ratessilikon.blogg.se

In all subjects, we observed preferential fMRI responses to contralateral azimuth positions. In this study, we investigated the validity of such a model in human AC with functional magnetic resonance imaging (fMRI) and a phase-encoding paradigm employing binaural stimuli recorded individually for each participant. To accommodate these findings, it has been proposed that sound location is encoded by the integrated activity of neuronal populations with opposite hemifield tuning ("opponent channel model"). Additionally, spatial selectivity decreases with increasing sound intensity. Recent electrophysiological research suggests that neurons in mammalian auditory cortex are characterized by broad spatial tuning and a preference for the contralateral hemifield, that is, a nonuniform sampling of sound azimuth. Opponent Coding of Sound Location ( Azimuth) in Planum Temporale is Robust to Sound-Level Variations.Ĭoding of sound location in auditory cortex (AC) is only partially understood. Our data thus support opponent channel coding as a neural mechanism for representing acoustic azimuth in human AC. This resulted in accurate decoding of sound azimuth location, which was unaffected by changes in sound level. We derived an opponent channel model of the fMRI responses by subtracting the activity of contralaterally tuned regions in bilateral planum temporale. Additionally, in most AC locations, spatial tuning was broad and not level invariant. To accommodate these findings, it has been proposed that sound location is encoded by the integrated activity of neuronal populations with opposite hemifield tuning (“opponent channel model”).

Opponent Coding of Sound Location ( Azimuth) in Planum Temporale is Robust to Sound-Level Variationsĭerey, Kiki Valente, Giancarlo de Gelder, Beatrice Formisano, EliaĬoding of sound location in auditory cortex (AC) is only partially understood.