Attention and probability effects in the human occipital cortex: An optical imaging study

被引:48
作者
Gratton, G
机构
[1] Department of Psychology, University of Missouri, 210 McAlester Hall, Columbia
关键词
functional brain imaging; occipital cortex; optical imaging; sensory memory; spatial selective attention; stimulus probability; VISUAL SELECTIVE ATTENTION; EVENT-RELATED POTENTIALS; HUMAN BRAIN; PET;
D O I
10.1097/00001756-199705060-00036
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
A new imaging technique (event-related optical signal, EROS) reveals the time course of neural activity in selected cortical areas of normal human subjects. This technique was used to study the event-related activity in striate and extrastriate occipital areas in an experiment in which spatial selective attention and stimulus probability were manipulated. The results show that attention effects are evident in the initial response in extrastriate cortex (latency < 100 ms), but not in striate cortex, confirming previous modeling efforts. They also show that the initial response in striate cortex is modulated by stimulus probability, suggesting the occurrence of pre-attentive memory phenomena in primary visual cortex.
引用
收藏
页码:1749 / 1753
页数:5
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