Shulman G L, Sullivan M A, Gish K, Sakoda W J
Perception. 1986;15(3):259-73. doi: 10.1068/p150259.
Adaptation and reaction-time techniques were used to examine the role of different spatial-frequency channels in the perception of local and global structure. Subjects were shown figures consisting of a large C composed of smaller Cs and asked to identify the orientation of either the global C or its local elements. Prior to performing the task subjects were adapted to different spatial frequencies and the effect on subsequent performance was assessed. Two main results were found. First, the adapting frequency that most affected the global task was often lower than that most affecting the local task, suggesting that high and low frequencies independently code the structure of an image. Second, reaction time to global figures was often faster than to local figures at all levels of detectability, again suggesting a role of low-frequency channels in global processing.
采用适应和反应时技术来检验不同空间频率通道在局部和整体结构感知中的作用。向受试者展示由较小的C组成的大C图形，并要求他们识别整体C或其局部元素的方向。在执行任务之前，让受试者适应不同的空间频率，并评估其对后续表现的影响。发现了两个主要结果。首先，对整体任务影响最大的适应频率通常低于对局部任务影响最大的频率，这表明高频和低频独立编码图像的结构。其次，在所有可检测水平上，对整体图形的反应时间通常比对局部图形的反应时间快，这再次表明低频通道在整体处理中发挥了作用。
