Bolognini Nadia, Rasi Fabrizio, Làdavas Elisabetta
Dipartimento di Psicologia, Università degli Studi di Bologna, Bologna, Italy.
Neuropsychologia. 2005;43(11):1655-61. doi: 10.1016/j.neuropsychologia.2005.01.015. Epub 2005 Mar 2.
Circumscribed hemispheric lesions in the right hemisphere have been shown to impair auditory spatial functions. Due to a strong crossmodal links that exist between vision and audition, in the present study, we have hypothesized that multisensory integration can play a specific role in recovery from spatial representational deficits. To this aim, a patient with severe auditory localization defect was asked to indicate verbally the spatial position where the sound was presented. The auditory targets were presented at different spatial locations, at 8 degrees, 24 degrees, 40 degrees, 56 degrees to either sides of the central fixation point. The task was performed either in a unimodal condition (i.e., only sounds were presented) or in crossmodal conditions (i.e., a visual stimulus was presented simultaneously to the auditory target). In the crossmodal conditions, the visual cue was presented either at the same spatial position as the sound or at 16 degrees or 32 degrees, nasal or temporal, of spatial disparity from the auditory target. The results showed that a visual stimulus strongly improves the patient's ability to localize the sounds, but only when it was presented in the same spatial position of the auditory target.
右侧半球的局限性半球病变已被证明会损害听觉空间功能。由于视觉和听觉之间存在强大的跨模态联系，在本研究中，我们假设多感官整合在从空间表征缺陷中恢复方面可以发挥特定作用。为此，我们要求一名患有严重听觉定位缺陷的患者口头指出声音呈现的空间位置。听觉目标在中央注视点两侧不同的空间位置呈现，分别为8度、24度、40度、56度。该任务在单模态条件下（即仅呈现声音）或跨模态条件下（即向听觉目标同时呈现视觉刺激）进行。在跨模态条件下，视觉线索要么在与声音相同的空间位置呈现，要么在与听觉目标空间视差为16度或32度的鼻侧或颞侧呈现。结果表明，视觉刺激能显著提高患者定位声音的能力，但前提是它在听觉目标的相同空间位置呈现。
