Eye-movement-driven changes in the perception of auditory space
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The perceptual localization of sensory stimuli often depends on body position, and, when action is required, sensory coordinates must be transformed into a motor reference frame. We investigated the role of such a reference frame change on visual and auditory spatial cognition. Participants had to make a saccade to a visual or auditory target and subsequently compare the location of a visual or auditory probe to the remembered location of the target. Neither visual nor auditory localization depended on trial-by-trial variability in saccade endpoint, suggesting that target locations are remapped across saccades in a manner allowing for oculomotor noise. We also compared visual and auditory localization performance before and after the systematic modification of saccade metrics by saccadic adaptation. Adaptation introduced systematic biases into transsaccadic visual and auditory localization behavior. These results show that information about eye movements is taken into account in both visual and auditory spatial cognition. We propose that auditory stimuli are remapped across saccades and that this eye-centered representation contributes to normal auditory localization.
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