Centre for Neuroscience Studies, Queen's University, Kingston, ON, Canada K7L 3N6.
Hear Res. 2010 Apr;262(1-2):19-25. doi: 10.1016/j.heares.2010.01.016. Epub 2010 Feb 6.
Although much is understood about the stimulus properties affecting the latency of saccadic eye movements to visual targets, relatively little is known about the properties affecting saccades to auditory targets. This study examined the effect of three primary acoustic features-frequency, intensity, and spatial location-on auditory saccade characteristics in humans, and compared them to visual saccades. Saccade targets were presented from an azimuthal array of speakers and LEDs spanning +/-36 degrees. There was an 'eccentricity effect' for auditory saccades such that latencies decreased by up to 70 ms with eccentricity. This was observed for all frequencies and intensities tested. There was a smaller effect in the opposite direction effect for visual saccades. Auditory saccades had similar latencies to visual saccades (within 5 ms) for near midline locations, but were up to 90 ms faster at eccentric locations (+/-36 degrees). Overall, saccadic latencies were shortest for wideband noise and narrowband noises with center frequencies falling within the human speech range. Examination of saccade accuracy showed decreasing accuracy with increasing eccentricity, and a negative correlation between accuracy and latency for auditory stimuli.
尽管人们对影响视觉目标扫视潜伏期的刺激特性有了很多了解，但对于影响听觉目标扫视的特性却知之甚少。本研究考察了三种主要的声学特征（频率、强度和空间位置）对人类听觉扫视特征的影响，并将其与视觉扫视进行了比较。扫视目标从一个跨越 +/-36 度的声纳和 LED 的方位角阵列呈现。对于听觉扫视，存在一种“离中效应”，即随着离中距离的增加，潜伏期缩短了多达 70 毫秒。这在所有测试的频率和强度下都观察到了。对于视觉扫视，在相反方向效应中观察到了较小的影响。在近中线位置，听觉扫视的潜伏期与视觉扫视相似（相差不到 5 毫秒），但在偏心位置（+/-36 度）时，速度要快 90 毫秒。总的来说，扫视潜伏期对于宽带噪声和中心频率落在人类语音范围内的窄带噪声最短。扫视准确性的检查显示，随着离中距离的增加准确性降低，并且听觉刺激的准确性和潜伏期之间呈负相关。
