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J Neurophysiol (October 21, 2009). doi:10.1152/jn.00500.2009
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Submitted on June 9, 2009
Revised on October 13, 2009
Accepted on October 13, 2009

Perception of auditory, visual, and egocentric spatial alignment adapts differently to changes in eye position

Qi N Cui1*, Babak Razavi1, William E O'Neill, and Gary D Paige2

1 University of Rochester Medical Center
2 Univ. of Rochester

* To whom correspondence should be addressed. E-mail: qi_cui{at}urmc.rochester.edu.

Vision and audition represent the outside world in spatial synergy that is crucial for guiding natural activities. Input conveying eye-in-head position is required to maintain spatial congruence since 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: 1) dependent upon a visual fixation reference, 2) selective for frequency-bands (high-pass and low-pass noise) related to specific auditory spatial channels, 3) matched by a shift in the perceived straight-ahead (PSA), and 4) accompanied by a spatial shift for visual and/or bi-modal (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 demonstrate that the spatial shift induced by ocular eccentricity is: 1) preserved for auditory targets without a visual fixation reference, 2) generalized for all frequency-bands, and thus all auditory spatial channels, 3) paralleled by a shift in PSA, and 4) restricted to auditory space. Findings are consistent with a set-point control strategy by which eye position governs multi-model 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.







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