Averaging facial expression over time.
Averaging facial expression over time.
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DOI：
10.1167/9.11.1
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发表时间：
2009-10-02
影响因子：
1.8
通讯作者：
Whitney D
中科院分区：
文献类型：
--
作者：
Haberman J;Harp T;Whitney D
视觉系统将相似的特征、对象和运动分组(例如，格式塔分组)。最近的工作表明，知觉分组背后的计算可能是一种汇总统计表示。对于诸如大小、运动和位置之类的低级别特征，甚至对于包括脸部在内的高级刺激，都会出现汇总表征；例如，观察者可以准确地感知一组脸部的平均表情。本实验的目的是表征这种面部整合机制的时间进程。在一系列的三个实验中，我们测量了观察者识别不同面孔的时间序列的平均表情的能力。面孔以4、12或20张为一组，时间频率从1.6到21.3赫兹。结果表明，观察者对不同面孔的时间序列的平均表情的感知与他们对重复呈现的单一面孔的感知一样准确。面部平均与时间频率或设定大小无关，但与暴露面部的总持续时间有关，时间常数约为800ms。这些实验提供了证据，证明视觉系统对随时间呈现的复杂对象的整体特征很敏感。
The visual system groups similar features, objects, and motion (e.g., Gestalt grouping). Recent work suggests that the computation underlying perceptual grouping may be one of summary statistical representation. Summary representation occurs for low-level features, such as size, motion, and position, and even for high level stimuli, including faces; for example, observers accurately perceive the average expression in a group of faces. The purpose of the present experiments was to characterize the time-course of this facial integration mechanism. In a series of three experiments, we measured observers’ abilities to recognize the average expression of a temporal sequence of distinct faces. Faces were presented in sets of 4, 12, or 20, at temporal frequencies ranging from 1.6 to 21.3 Hz. The results revealed that observers perceived the average expression in a temporal sequence of different faces as precisely as they perceived a single face presented repeatedly. The facial averaging was independent of temporal frequency or set size, but depended on the total duration of exposed faces, with a time constant of ~800 ms. These experiments provide evidence that the visual system is sensitive to the ensemble characteristics of complex objects presented over time.
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DOI：
10.1177/1534582305276839
发表时间：
2005-03-01
期刊：
Behavioral and cognitive neuroscience reviews
影响因子：
--
作者：
Blake, Randolph;Lee, Sang-Hun
通讯作者：
Lee, Sang-Hun
影响因子：
2.3
作者：
Leppänen, JM;Hietanen, JK
通讯作者：
Hietanen, JK
影响因子：
1.8
作者：
Chong, SC;Treisman, A
通讯作者：
Treisman, A
影响因子：
1.8
作者：
Chong, SC;Treisman, A
通讯作者：
Treisman, A
DOI：
10.1037/a0013899
发表时间：
2009-06
影响因子：
2.1
作者：
Haberman, Jason;Whitney, David
通讯作者：
Whitney, David