Journal
COGNITIVE BRAIN RESEARCH
Volume 10, Issue 1-2, Pages 77-83Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0926-6410(00)00024-0
Keywords
multisensory integration; crossmodal integration; event-related potential; high-density mapping; somatosensory cortex; auditory cortex; ERP; AEP; SEP; human; binding
Funding
- NIMH NIH HHS [R01 MH065350-01A2, MH49334, R01 MH065350, MH1143, MH01439] Funding Source: Medline
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We investigated the time-course and scalp topography of multisensory interactions between simultaneous auditory and somatosensory stimulation in humans. Event-related potentials (ERPs) were recorded from 64 scalp electrodes while subjects were presented with auditory-alone stimulation (1000-Hz tones), somatosensory-alone stimulation (median nerve electrical pulses), and simultaneous auditory-somatosensory (AS) combined stimulation. Interaction effects were assessed by comparing the responses to combined stimulation with the algebraic sum of responses to the constituent auditory and somatosensory stimuli when they were presented alone. Spatiotemporal analysis of ERPs and scalp current density (SCD) topographies revealed AS interaction over the central/postcentral scalp which onset at approximately 50 ms post-stimulus presentation. Both the topography and timing of these interactions are consistent with multisensory integration early in the cortical processing hierarchy, in brain regions traditionally held to be unisensory. (C) 2000 Elsevier Science B.V. All rights reserved.
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