Multisensory Integration Shortens Physiological Response Latencies

Benjamin A. Rowland · Stephan Quessy · Terrence R. Stanford · Barry E. Stein

191 citations0/0 files storedJournal of Neuroscience

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Multisensory perception and integration Visual perception and processing mechanisms Neural dynamics and brain function

Abstract

Individual superior colliculus (SC) neurons integrate information from multiple sensory sources to enhance their physiological response. The response of an SC neuron to a cross-modal stimulus combination can not only exceed the best component unisensory response but can also exceed their arithmetic sum (i.e., superadditivity). The present experiments were designed to investigate the temporal profile of multisensory integration in this model system. We found that cross-modal stimuli frequently shortened physiological response latencies (mean shift, 6.2 ms) and that response enhancement was greatest in the initial phase of the response (the phenomenon of initial response enhancement). The vast majority of the responses studied evidenced superadditive computations, most often at the beginning of the multisensory response.

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References

1994The merging of the senses 1983Interactions Among Converging Sensory Inputs in the Superior Colliculus 1987Determinants of multisensory integration in superior colliculus neurons. I. Temporal factors 1989Behavioral Indices of Multisensory Integration: Orientation to Visual Cues is Affected by Auditory Stimuli 2004Bimodal and trimodal multisensory enhancement: Effects of stimulus onset and intensity on reaction time 1995Spatial and temporal factors determine auditory-visual interactions in human saccadic eye movements 2005Evaluating the Operations Underlying Multisensory Integration in the Cat Superior Colliculus 1994Visual-auditory interactions in sensorimotor processing: Saccades versus manual responses.

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