Petropavlovskaia E A, Shestopalova L B, Vaĭtulevich S F
Zh Vyssh Nerv Deiat Im I P Pavlova. 2011 May-Jun;61(3):293-305.
The ability to localize endpoints of sound image trajectories was studied in comparison with stationary sound image positions. Sound images moved either gradually or abruptly to the left or right from the head midline. Different types of sound image movement were simulated by manipulating the interaural time delay. Subjects were asked to estimate the position of the virtual sound source, using the graphic tablet. It was revealed that the perceived endpoints of the moving sound image trajectories, like stationary stimulus positions, depended on the interaural time delay. The perceived endpoints of the moving sound images simulated by stimuli with the final interaural time delay lower than 200 micros were displaced further from the head midline as compared to stationary stimuli of the same interaural time delays. This forward displacement of the perceived position of the moving target can be considered as "representational momentum" and can be explained by mental extrapolation of the dynamic information, which is necessary for successive sensorimotor coordination. For interaural time delays above 400 micros, final positions of gradually and abruptly moving sound sources were closer to the head midline than corresponding stationary sound image position. When comparing the results of both duration conditions, it was shown that in case of longer stimuli the endpoints of gradually moving sound images were lateralized further from the head midline for interaural time delays above 400 micros.
与静止的声像位置相比，研究了定位声像轨迹端点的能力。声像从头部中线逐渐或突然向左或向右移动。通过操纵双耳时间延迟来模拟不同类型的声像移动。要求受试者使用图形输入板估计虚拟声源的位置。结果表明，移动声像轨迹的感知端点与静止刺激位置一样，取决于双耳时间延迟。与具有相同双耳时间延迟的静止刺激相比，最终双耳时间延迟低于200微秒的刺激所模拟的移动声像的感知端点离头部中线更远。移动目标感知位置的这种向前位移可被视为“表征动量”，并且可以通过动态信息的心理外推来解释，这对于连续的感觉运动协调是必要的。对于高于400微秒的双耳时间延迟，逐渐和突然移动的声源的最终位置比相应的静止声像位置更靠近头部中线。在比较两种时长条件的结果时发现，对于高于400微秒的双耳时间延迟，在较长刺激的情况下，逐渐移动的声像的端点离头部中线的侧向化更远。
