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1 The Cognitive Neurophysiology Laboratory, Program in Cognitive Neuroscience and Schizophrenia, Nathan S. Kline Institute for Psychiatric Research, Orangeburg, New York, United States; Program in Cognitive Neuroscience, Department of Psychology, The City College of the City University of New York, New York, New York, United States
2 The Cognitive Neurophysiology Laboratory, Program in Cognitive Neuroscience and Schizophrenia, Nathan S. Kline Institute for Psychiatric Research, Orangeburg, New York, United States
3 Department of Neurological Surgery, Weill Cornell Medical College, New York Presbyterian Hospital, New York, New York, United States
4 Dartmouth Functional Brain Imaging Center, Center for Cognitive Neuroscience, Dartmouth College, Hanover, New Hampshire, United States
5 Department of Radiology, Weill Cornell Medical College, New York Presbyterian Hospital, New York, New York, United States
* To whom correspondence should be addressed. E-mail: molholm{at}nki.rfmh.org.
Intracranial recordings from three human subjects provide the first direct electrophysiological evidence for audio-visual multisensory processing in the human Superior Parietal Lobule (SPL). Auditory and visual sensory inputs project to the same highly localized region of the parietal cortex with auditory inputs arriving considerably earlier (30 ms) than visual inputs (75 ms). Multisensory integration processes in this region were assessed by comparing the response to simultaneous audio-visual stimulation with the algebraic sum of responses to the constituent auditory and visual unisensory stimulus conditions. Significant integration effects were seen with almost identical morphology across the three subjects, beginning between 120-160 ms. These results are discussed in the context of the role of the SPL in supramodal spatial attention and sensory-motor transformations.
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