Contextual task difficulty modulates stimulus discrimination: electrophysiological evidence for interaction between sensory and executive processes.
Contextual task difficulty modulates stimulus discrimination: electrophysiological evidence for interaction between sensory and executive processes.
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DOI：
10.1111/j.1469-8986.2012.01455.x
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发表时间：
2012-10
期刊：
影响因子：
3.7
通讯作者：
Parasuraman R
中科院分区：
文献类型：
--
作者：
Fedota JR;McDonald CG;Roberts DM;Parasuraman R
事件相关电位（ERP）的枕颞N1分量先前已被证明是刺激辨别过程的索引。然而，N1并没有一直被证明对刺激辨别的困难敏感。在这里，我们通过调节连续呈现的目标和非目标之间的相似性来操纵刺激辨别的难度。同样的目标刺激被用于简单和困难的辨别情境中，这些物理上相同的目标刺激在困难的任务情境中引起了更大的N1和更小的P3b。此外，当靶标被错误分类时，N1振幅减弱，P3b未被激发。这些发现提供了证据，表明N1成分反映了一个由执行控制调节的感觉辨别过程，并且当刺激辨别困难时，该成分可以索引辨别错误。
The occipital-temporal N1 component of the event-related potential (ERP) has previously been shown to index a stimulus discrimination process. However, the N1 has not consistently been shown to be sensitive to the difficulty of stimulus discrimination. Here we manipulated the difficulty of stimulus discrimination by modulating the similarity between serially presented targets and non-targets. The same target stimulus was employed in both easy and difficult discrimination contexts, and these physically identical target stimuli elicited a larger N1 and smaller P3b in the difficult task context. Moreover, when targets were incorrectly categorized, N1 amplitude was diminished and a P3b was not elicited. These findings provide evidence that the N1 component reflects a sensory discrimination process that is modulated by executive control, and that this component can index discrimination errors when stimulus discrimination is difficult.
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影响因子：
2.5
作者：
Boudreau, C. Elizabeth;Williford, Tori H.;Maunsell, John H. R.
通讯作者：
Maunsell, John H. R.
DOI：
10.3758/bf03212070
发表时间：
2000-01-01
期刊：
PERCEPTION & PSYCHOPHYSICS
影响因子：
--
作者：
Handy, TC;Mangun, GR
通讯作者：
Mangun, GR
DOI：
10.1037/0096-1523.20.4.887
发表时间：
1994-08-01
影响因子：
2.1
作者：
LUCK, SJ;HILLYARD, SA;HAWKINS, HL
通讯作者：
HAWKINS, HL
影响因子：
3.7
作者：
JOHNSON, R
通讯作者：
JOHNSON, R
影响因子：
56.9
作者：
de Fockert, JW;Rees, G;Lavie, N
通讯作者：
Lavie, N