Responses of neurons in the inferior colliculus to dynamic interaural phase cues: evidence for a mechanism of binaural adaptation.

摘要: Responses to sound stimuli that humans perceive as moving were obtained for 89 neurons in the inferior colliculus (IC) of urethan-anesthetized guinea pigs. Triangular and sinusoidal interaural phase modulation (IPM), which produced dynamically varying disparities (IPDs), was used present with different depths, directions, centers, rates apparent motion. Many appeared sensitive dynamic IPDs, responses at any given IPD depending strongly on IPDs stimulus had just passed through. However, it temporal pattern response, rather than motion cues IPM, determined sensitivity features such depth, direction, center locus. IPM restricted only responsive area, evoked lower discharge when either moved through area from outside, or up down its flanks. When response first one direction then back other, same responses, away always toward center. closer reversed center, following lower. In no case did we find evidence under all conditions preferred other. We conclude IC depend not history stimulation, per se, but their irrespective specific evoke those responses. These data are consistent involvement an adaptation mechanism resides above level binaural integration. our provide specialized detection involving auditory midbrain mammal.