Perception of Auditory, Visual, and Egocentric Spatial Alignment Adapts Differently to Changes in Eye Position
Identifieur interne : 004127 ( Main/Exploration ); précédent : 004126; suivant : 004128Perception of Auditory, Visual, and Egocentric Spatial Alignment Adapts Differently to Changes in Eye Position
Auteurs : Qi N. Cui ; Babak Razavi [États-Unis] ; William E. O'Neill ; Gary D. PaigeSource :
- Journal of Neurophysiology [ 0022-3077 ] ; 2009.
Abstract
Vision and audition represent the outside world in spatial synergy that is crucial for guiding natural activities. Input conveying eye-in-head position is needed to maintain spatial congruence because the eyes move in the head while the ears remain head-fixed. Recently, we reported that the human perception of auditory space shifts with changes in eye position. In this study, we examined whether this phenomenon is
Url:
DOI: 10.1152/jn.00500.2009
PubMed: 19846626
PubMed Central: 2822679
Affiliations:
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<front><div type="abstract" xml:lang="en"><p>Vision and audition represent the outside world in spatial synergy that is crucial for guiding natural activities. Input conveying eye-in-head position is needed to maintain spatial congruence because the eyes move in the head while the ears remain head-fixed. Recently, we reported that the human perception of auditory space shifts with changes in eye position. In this study, we examined whether this phenomenon is <italic>1</italic>
) dependent on a visual fixation reference, <italic>2</italic>
) selective for frequency bands (high-pass and low-pass noise) related to specific auditory spatial channels, <italic>3</italic>
) matched by a shift in the perceived straight-ahead (PSA), and <italic>4</italic>
) accompanied by a spatial shift for visual and/or bimodal (visual and auditory) targets. Subjects were tested in a dark echo-attenuated chamber with their heads fixed facing a cylindrical screen, behind which a mobile speaker/LED presented targets across the frontal field. Subjects fixated alternating reference spots (0, ±20°) horizontally or vertically while either localizing targets or indicating PSA using a laser pointer. Results showed that the spatial shift induced by ocular eccentricity is <italic>1</italic>
) preserved for auditory targets without a visual fixation reference, <italic>2</italic>
) generalized for all frequency bands, and thus all auditory spatial channels, <italic>3</italic>
) paralleled by a shift in PSA, and <italic>4</italic>
) restricted to auditory space. Findings are consistent with a set-point control strategy by which eye position governs multimodal spatial alignment. The phenomenon is robust for auditory space and egocentric perception, and highlights the importance of controlling for eye position in the examination of spatial perception and behavior.</p>
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