Watamaniuk Scott N J, Heinen Stephen J
Wright State University, Department of Psychology, Dayton, OH, USA.
J Vis. 2003 Nov 21;3(11):698-709. doi: 10.1167/3.11.5.
Psychophysical studies have demonstrated that humans are less sensitive to image acceleration than to image speed (e.g., Gottsdanker, 1956; Werkhoven, Snippe, & Toet, 1992). Because there is evidence that a common motion-processing stage subserves perception and pursuit (e.g., Watamaniuk & Heinen, 1999), either pursuit should be similarly impaired in discriminating acceleration or it must receive input from a system different from the one that processes visual motion for perception. We assessed the sensitivity of pursuit to acceleration or speed, and compared the results with those obtained in perceptual experiments done with similar stimuli and tasks. Specifically, observers pursued or made psychophysical judgments of targets that moved at randomly selected base speeds and subsequent accelerations. Oculomotor and psychophysical discrimination were compared by analyzing performance for the entire stimulus set sorted by either target acceleration or speed. Thresholds for pursuit and perception were higher for target acceleration than speed, further evidence that a common motion-processing stage limits the performance of both systems.
心理物理学研究表明，人类对图像加速度的敏感度低于对图像速度的敏感度（例如，Gottsdanker，1956年；Werkhoven、Snippe和Toet，1992年）。因为有证据表明，一个共同的运动处理阶段服务于感知和追踪（例如，Watamaniuk和Heinen，1999年），所以要么追踪在辨别加速度方面也会受到类似的损害，要么它必须从一个不同于处理视觉运动以进行感知的系统接收输入。我们评估了追踪对加速度或速度的敏感度，并将结果与使用类似刺激和任务进行的感知实验结果进行了比较。具体而言，观察者追踪或以心理物理学方式判断以随机选择的基本速度和随后的加速度移动的目标。通过分析按目标加速度或速度分类的整个刺激集的表现，比较了动眼辨别和心理物理学辨别。追踪和感知的阈值对于目标加速度高于速度，这进一步证明了一个共同的运动处理阶段限制了两个系统的表现。
