alexa Bimodal interactions in the superior colliculus of the behaving cat.
Biomedical Sciences

Biomedical Sciences

Journal of Bioengineering & Biomedical Science

Author(s): Populin LC, Yin TC, Populin LC, Yin TC, Populin LC, Yin TC, Populin LC, Yin TC

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Abstract Bimodal enhancement, a form of nonlinear summation of physiological responses from two sensory modalities, has been demonstrated in the intermediate layers of the superior colliculus (SCi) and is thought to be a manifestation of a neural mechanism underlying behavioral facilitation to such stimuli. Most physiological studies, however, have been performed in anesthetized animals. We tested for bimodal enhancement in the SCi of behaving cats trained to orient to acoustic, visual, and bimodal stimuli. Surprisingly, we never observed the large enhanced responses reported in anesthetized animals, even when we varied the time between presentation of the visual and acoustic stimuli and/or decreased the level of the stimuli. Using three different behavioral paradigms, we found no support for enhanced interactions between auditory and visual modalities. Prominent depressive effects were seen, however, particularly when the cats were required to fixate a visual target during presentation of an acoustic stimulus. This article was published in J Neurosci and referenced in Journal of Bioengineering & Biomedical Science

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