Evidence of visual processing negativity with attention to orientation and color in central space

被引:45
作者
Karayanidis, F
Michie, PT
机构
[1] MACQUARIE UNIV,SCH BEHAV SCI,SYDNEY,NSW 2109,AUSTRALIA
[2] UNIV WESTERN AUSTRALIA,DEPT PSYCHIAT,PERTH,WA 6009,AUSTRALIA
[3] UNIV WESTERN AUSTRALIA,DEPT PSYCHOL,PERTH,WA 6009,AUSTRALIA
来源
ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY | 1997年 / 103卷 / 02期
基金
澳大利亚研究理事会;
关键词
processing negativity; visual attention; feature conjunction;
D O I
10.1016/S0013-4694(97)96077-6
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
The aim of this study was to determine whether the visual frontal processing negativity reported in our earlier paper (Karayanidis, F. and Michie, P.T. Electroenceph. clin. Neurophysiol., 1996, 99: 38-56) is related to selection of spatial location, or occurs regardless of the stimulus features used to define the target. Subjects were instructed to respond to infrequent target stimuli of a particular combination of orientation, color and size. All stimuli were presented at central fixation. Posteriorly, orientation selection enhanced P125 amplitude over the right hemisphere but neither orientation nor color selection had an effect on N190. Posterior selection negativities emerged for orientation, color and their conjunction. At anterior sites, widespread effects of orientation and color processing were evident. The effect of location selection on the anterior N1 seen in our previous study was not evident with orientation selection. Instead, selection of orientation, color and their conjunction resulted in P145-250 frontally. Two later anterior negativities emerged. The early negativity (vPNe) was affected independently by orientation and color selection while the late negativity (vPNI) was affected only by selection of feature conjunction. Thus, the present results show that, like its auditory counterpart, the visual processing negativity occurs with a variety of stimulus classification features and is not exclusively related to spatial selection. (C) 1997 Elsevier Science Ireland Ltd.
引用
收藏
页码:282 / 297
页数:16
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