| Steady-state responses in MEG demonstrate information integration within but not across the auditory and visual senses. | |
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MedLine Citation:
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PMID: 22305992 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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To form a unified percept of our environment, the human brain integrates information within and across the senses. This MEG study investigated interactions within and between sensory modalities using a frequency analysis of steady-state responses that are elicited time-locked to periodically modulated stimuli. Critically, in the frequency domain, interactions between sensory signals are indexed by crossmodulation terms (i.e. the sums and differences of the fundamental frequencies). The 3×2 factorial design, manipulated (1) modality: auditory, visual or audiovisual (2) steady-state modulation: the auditory and visual signals were modulated only in one sensory feature (e.g. visual gratings modulated in luminance at 6Hz) or in two features (e.g. tones modulated in frequency at 40Hz & amplitude at 0.2Hz). This design enabled us to investigate crossmodulation frequencies that are elicited when two stimulus features are modulated concurrently (i) in one sensory modality or (ii) in auditory and visual modalities. In support of within-modality integration, we reliably identified crossmodulation frequencies when two stimulus features in one sensory modality were modulated at different frequencies. In contrast, no crossmodulation frequencies were identified when information needed to be combined from auditory and visual modalities. The absence of audiovisual crossmodulation frequencies suggests that the previously reported audiovisual interactions in primary sensory areas may mediate low level spatiotemporal coincidence detection that is prominent for stimulus transients but less relevant for sustained SSR responses. In conclusion, our results indicate that information in SSRs is integrated over multiple time scales within but not across sensory modalities at the primary cortical level. |
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Authors:
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Anette S Giani; Erick B Ortiz; Paolo Belardinelli; Mario Kleiner; Hubert Preissl; Uta Noppeney |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-1-28 |
Journal Detail:
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Title: NeuroImage Volume: - ISSN: 1095-9572 ISO Abbreviation: - Publication Date: 2012 Jan |
Date Detail:
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Created Date: 2012-2-6 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9215515 Medline TA: Neuroimage Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2012. Published by Elsevier Inc. |
Affiliation:
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Max Planck Institute for Biological Cybernetics, Tuebingen, Germany. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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