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| Research article summary (published 18 May 2009): |
Natural, metaphoric, and linguistic auditory direction signals have distinct influences on visual motion processing.
Full Abstract
To interact with our dynamic environment, the brain merges motion information from auditory and visual senses. However, not only "natural" auditory MOTION, but also "metaphoric" de/ascending PITCH and SPEECH (e.g., "left/right"), influence the visual motion percept. Here, we systematically investigate whether these three classes of direction signals influence visual motion perception through shared or distinct neural mechanisms. In a visual-selective attention paradigm, subjects discriminated the direction of visual motion at several levels of reliability, with an irrelevant auditory stimulus being congruent, absent, or incongruent. Although the natural, metaphoric, and linguistic auditory signals were equally long and adjusted to induce a comparable directional bias on the motion percept, they influenced visual motion processing at different levels of the cortical hierarchy. A significant audiovisual interaction was revealed for MOTION in left human motion complex (hMT+/V5+) and for SPEECH in right intraparietal sulcus. In fact, the audiovisual interaction gradually decreased in left hMT+/V5+ for MOTION > PITCH > SPEECH and in right intraparietal sulcus for SPEECH > PITCH > MOTION. In conclusion, natural motion signals are integrated in audiovisual motion areas, whereas the influence of culturally learnt signals emerges primarily in higher-level convergence regions.
Author information
Author/s: Sadaghiani, Sepideh (S); Maier, Joost X (JX); Noppeney, Uta (U);
Affiliation: Max Planck Institute for Biological Cybernetics, 72076 Tübingen, Germany.
Journal and publication information
Publication Type: Journal Article; Research Support, Non-U.S. Gov't
Journal: The Journal of neuroscience : the official journal of the Society for Neuroscience (J Neurosci), published in United States. (Language: eng)
Reference: 2009-May; vol 29 (issue 20) : pp 6490-9
Dates: Created 2009/05/21; Completed 2009/06/08;
PMID: 19458220, status: MEDLINE (last retrieval date: 6/8/2009, IMS Date: 08 Jun 2009 00:00:00)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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