Railo Henry, Andersson Eki, Kaasinen Valtteri, Laine Teemu, Koivisto Mika
Department of Psychology, University of Turku, FI-20014 Turku, Finland; Centre for Cognitive Neuroscience, University of Turku, FI-20014 Turku, Finland.
Department of Psychology, University of Turku, FI-20014 Turku, Finland.
Brain Stimul. 2014 May-Jun;7(3):415-20. doi: 10.1016/j.brs.2014.01.060. Epub 2014 Mar 4.
Large amount of data concerning the neural mechanisms that mediate unconscious vision come from cortically blind patients who can process stimuli presented in their blind visual field. How well the findings generalize to neurologically healthy humans remains open.
Using transcranial magnetic stimulation (TMS), we studied whether chromatic processing depends on the early visual cortex in healthy participants.
We employed a phenomenon called the redundant target effect (RTE): simple reaction times to two stimuli are faster than to one stimulus, even when one of the stimuli is presented outside consciousness.
The RTE produced by chromatically defined stimuli disappeared when the contralateral stimulus of two bilateral stimuli was suppressed from consciousness.
In contrast to studies on blindsight patients, the results imply that the early visual cortex is necessary for the processing of chromatic information in neurologically healthy humans.
大量关于介导无意识视觉的神经机制的数据来自皮质盲患者，这些患者能够处理呈现在其盲视野中的刺激。这些研究结果在多大程度上适用于神经功能正常的人类仍不明确。
使用经颅磁刺激（TMS），我们研究了在健康参与者中颜色处理是否依赖于早期视觉皮层。
我们采用了一种称为冗余目标效应（RTE）的现象：对两个刺激的简单反应时间比对一个刺激的反应时间更快，即使其中一个刺激是在意识之外呈现的。
当两个双侧刺激中的对侧刺激被意识抑制时，由颜色定义的刺激产生的RTE消失。
与对盲视患者的研究相反，结果表明早期视觉皮层对于神经功能正常的人类处理颜色信息是必要的。
