Department of Psychology, Tulane University, United States; Program in Neuroscience, Tulane University, United States.
Department of Psychology, Tulane University, United States.
Cognition. 2020 Jan;194:104058. doi: 10.1016/j.cognition.2019.104058. Epub 2019 Sep 5.
Auditory spatial attention faces the conflicting demands of focusing on the current task while also rapidly shifting location to unexpected stimuli. We examined the interplay of sustained focus and intermittent shifts in an auditory spatial attention task. Most trials required a choice response from a standard location in virtual space (L-R: -90°, 0°, +90°), but occasionally the location shifted between 45°-180°. Reaction time curves for angular shifts had a quadratic shape, with slowing for small shifts but faster reaction times for larger shifts. The reaction time curves were maintained at faster stimulus rates and usually scaled to fit the range of stimulus locations. However, focus on the right had an attenuated curve, and did not scale to the range of locations. The findings suggest two mechanisms: a top-down bias centered on standard locations that decreases with distance, and a bottom-up bias that under these conditions increases with distance from the standard location.
听觉空间注意力面临着既要专注于当前任务，又要迅速将注意力转移到意外刺激的矛盾要求。我们研究了听觉空间注意力任务中持续关注和间歇性转移之间的相互作用。大多数试验要求从虚拟空间的标准位置（L-R：-90°、0°、+90°）做出选择反应，但偶尔位置会在 45°-180°之间转移。角度转移的反应时曲线呈二次曲线形状，小转移时反应时间变慢，但大转移时反应时间更快。反应时曲线在较快的刺激率下保持不变，通常与刺激位置的范围相适应。然而，对右侧的关注具有衰减的曲线，并且不能与位置的范围相适应。研究结果表明存在两种机制：一种以标准位置为中心的自上而下的偏差，该偏差随距离的增加而减小，另一种自下而上的偏差，在这种情况下，该偏差随与标准位置的距离的增加而增加。
