ATTENTION TO PATTERN ORIENTATION - NEGATIVE CORTICAL POTENTIALS, REACTION-TIME, AND THE SELECTION PROCESS
ATTENTION TO PATTERN ORIENTATION - NEGATIVE CORTICAL POTENTIALS, REACTION-TIME, AND THE SELECTION PROCESS
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DOI：
10.1016/0013-4694(80)90389-2
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发表时间：
1980-01-01
期刊：
影响因子：
--
通讯作者：
GUIDO, W
中科院分区：
文献类型：
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作者：
HARTER, MR;GUIDO, W
受试者(6人)被要求以1/720-1180毫秒的速度对随机呈现的3个刺激中的1个做出RT[反应时间]反应。刺激是漫反射光闪光和具有水平或垂直方向的9‘’黑白条的栅格光闪光。通过让受试者在相关刺激后375毫秒内做出RT反应来控制注意力。对相关和无关刺激的诱发电位在大脑皮层的枕叶(Oz)、中央(Cz)和额叶(Fz)区域被单次记录。与无关的闪光相比，相关闪光后的枕叶电位在刺激后150-250ms之间相对更负(Oz：N235电位)。负电位的早期部分(150-200ms)反映了漫射闪光和图案化闪光之间的选择，而不是闪光中图案方向之间的选择。负电位的后半部分(200-250毫秒)反映了闪光中图案方向之间的选择。相关和不相关刺激后的枕叶电位不仅反映了对相关和无关信息的不同处理，而且还反映了不同处理的单位或特异性的渐进性变化。sb.负电位的早期和晚期部分反映了基于相关刺激的一般和随后的特定特征的不同处理。相关刺激后额叶皮质电位在刺激后150-250ms之间为轻度正值(FZ：P235电位)。这些早期注意力效应的独特头皮分布表明。**图表**。反映了纹外视皮层内潜在的过程。在相关刺激(P370)后的370ms左右，所有电极都有明显的晚期正电位峰值，尽管它有中央-枕部的最大值。由于这种电位跟随RT反应，它似乎反映了与对相关刺激的选择性反应直接相关的过程不同的过程。
Human subjects (6) were instructed to give a RT [reaction time] response to 1 of 3 stimuli randomly presented at a rate of 1/720-1180 ms. The stimuli were diffuse light flashes and grating light flashes with 9'' black and white bars oriented either horizontally or vertically. Attention was controlled by having the subject give a RT response within 375 ms following the relevant stimulus. Evoked potentials to the relevant and irrelevant stimuli were recorded monopolarly over the occipital (Oz), central (Cz), and frontal (Fz) areas of the cortex. Occipital potentials following relevant, as compared to irrelevant, flashes, were relatively more negative between 150 and 250 ms poststimulus (Oz:N235 potential). The early portion of the negative potential (150-200 ms) reflected selection between diffuse and patterned flashes, but not between the orientations of the pattern in the flashes. The later portion of the negative potential (200-250 ms) reflected selection between the orientations of the pattern in the flashes. Occipital potentials following relevant and irrelevant stimuli reflect not only differential processing of relevant and irrelevant information but also reflect a progressive change in the unit or specificity of the differential processing.sbd.early and late portions of the negative potential reflecting differential processing on the basis of, first, the general and, then, the specific characteristics of the relevant stimulus. Frontal cortical potentials following relevant stimuli were slightly positive between 150-250 ms poststimulus (Fz:P235 potential). The unique scalp distribution of these early attention effects suggests that .**GRAPHIC**. reflects an intramodality underlying process localized in extrastriate visual cortex. A late positive potential peaking at about 370 ms following relevant stimuli (P370) was evident at all electrodes, although it had a central-occipital maximum. Since this potential followed the RT responses, it appeared to reflect processes other than those directly involved in the selective response to relevant stimuli.