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Front Neural Circuits. 2012 Sep 5;6:61. doi: 10.3389/fncir.2012.00061. eCollection 2012.

Distribution of visual and saccade related information in the monkey inferior colliculus.

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Department of Psychology, Cornell University Ithaca, NY, USA.


The inferior colliculus (IC) is an essential stop early in the ascending auditory pathway. Though normally thought of as a predominantly auditory structure, recent work has uncovered a variety of non-auditory influences on firing rate in the IC. Here, we map the location within the IC of neurons that respond to the onset of a fixation-guiding visual stimulus. Visual/visuomotor associated activity was found throughout the IC (overall, 84 of 199 sites tested or 42%), but with a far reduced prevalence and strength along recording penetrations passing through the tonotopically organized region of the IC, putatively the central nucleus (11 of 42 sites tested, or 26%). These results suggest that visual information has only a weak effect on early auditory processing in core regions, but more strongly targets the modulatory shell regions of the IC.


auditory; cross-modal; multisensory; vision

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