A neuronal correlate of the precedence effect is associated with spatial selectivity in the barn owl's auditory midbrain

Journal of Neurophysiology
Matthew W SpitzerTerry T Takahashi

Abstract

Sound localization in echoic conditions depends on a precedence effect (PE), in which the first arriving sound dominates the perceived location of later reflections. Previous studies have demonstrated neurophysiological correlates of the PE in several species, but the underlying mechanisms remain unknown. The present study documents responses of space-specific neurons in the barn owl's inferior colliculus (IC) to stimuli simulating direct sounds and reflections that overlap in time at the listener's ears. Responses to 100-ms noises with lead-lag delays from 1 to 100 ms were recorded from neurons in the space-mapped subdivisions of IC in anesthetized owls (N2O/isofluorane). Responses to a target located at a unit's best location were usually suppressed by a masker located outside the excitatory portion of the spatial receptive field. The least spatially selective units exhibited temporally symmetric effects, in that the amount of suppression was the same whether the masker led or lagged. Such effects mirror the alteration of localization cues caused by acoustic superposition of leading and lagging sounds. In more spatially selective units, the suppression was often temporally asymmetric, being more pronounced when the masker led...Continue Reading

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Citations

May 21, 2008·Biological cybernetics·T T TakahashiE A Whitchurch
Nov 24, 2012·Journal of Neurophysiology·Caitlin S BaxterTerry T Takahashi
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May 20, 2006·Journal of Neurophysiology·Matthew W Spitzer, Terry T Takahashi
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Jul 3, 2015·Journal of Neurophysiology·Yan GaiTom C T Yin
Oct 22, 2017·The Journal of Comparative Neurology·Katharina LischkaStefan Weigel

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