Rainville Stéphane, Clarke Aaron
Center for Visual Neuroscience, Department of Psychology, North Dakota State University, Fargo, ND 58105, USA.
J Vis. 2008 Nov 21;8(15):9.1-15. doi: 10.1167/8.15.9.
S. E. Guttman, L. A. Gilroy, and R. Blake (2005) investigated whether observers could perform temporal grouping in multi-element displays where each local element was stochastically modulated over time along one of several potential dimensions--or "messenger types"--such as contrast, position, orientation, or spatial scale. Guttman et al.'s data revealed that grouping discards messenger type and therefore support a single-pathway model that groups elements with similar temporal waveforms. In the current study, we carried out three experiments in which temporal-grouping information resided either in the carrier, the envelope, or the combined carrier and envelope of each messenger's timecourse. Results revealed that grouping is highly specific for messenger type if carrier envelopes lack grouping information but largely messenger nonspecific if carrier envelopes contain grouping information. These imply that temporal grouping is mediated by several messenger-specific carrier pathways as well as by a messenger-nonspecific envelope pathways. Findings also challenge simple temporal-filtering accounts of perceptual grouping (E. H. Adelson & H. Farid, 1999).
S. E. 古特曼、L. A. 吉尔罗伊和R. 布莱克（2005年）研究了观察者是否能够在多元素显示中进行时间分组，其中每个局部元素会随着时间沿着几个潜在维度之一——或“信使类型”——随机调制，例如对比度、位置、方向或空间尺度。古特曼等人的数据表明，分组会忽略信使类型，因此支持一种单通路模型，该模型对具有相似时间波形的元素进行分组。在当前研究中，我们进行了三项实验，其中时间分组信息分别存在于每个信使时间进程的载波、包络或载波与包络的组合中。结果表明，如果载波包络缺乏分组信息，分组对信使类型具有高度特异性，但如果载波包络包含分组信息，则分组在很大程度上对信使不具有特异性。这些结果表明，时间分组是由几种信使特异性载波通路以及信使非特异性包络通路介导的。研究结果还对感知分组的简单时间滤波解释（E. H. 阿德尔森和H. 法里德，1999年）提出了挑战。
