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采用稳态视觉诱发电位探讨了注意在空间上的分布.稳态视觉诱发电位是由闪烁刺激引起的大脑视觉皮层的电位变化,具有与闪烁刺激相同的基波.本研究中,我们呈现2个闪烁刺激(方块),一个是目标刺激,另一个是干扰刺激;前者呈现在屏幕的中央位置(该位置上呈现字母序列),后者呈现在其左侧或者右侧,要求被试探测字母序列中的目标字母.实验中操作2个闪烁刺激之间的距离.结果表明,干扰刺激产生的稳态视觉诱发电位的振幅在最靠近注意焦点时得到增强,在较远时得到了抑制.但是,当干扰刺激处于更远的位置时,其振幅又有所恢复.同时,由目标闪烁刺激所产生的稳态视觉诱发电位的振幅在3种距离的情景下保持不变.因此,本研究认为在传统的注意“聚光灯”周围存在着抑制的区域.另外,稳态视觉诱发电位的实验范式为研究注意的抑制机制提供了新的途径.
Steady-state visual evoked potentials were used to investigate the spatial distribution of attention. Steady-state visual evoked potentials are changes in the electrical potential of the cerebral visual cortex caused by scintillation stimulation with the same fundamental as the scintillation stimulus.In this study, we present 2 Blinking stimuli (squares), one is the target stimulus and the other is disturbing stimuli; the former appears in the center of the screen (in this position a sequence of letters appears), the latter appearing on its left or right side, requiring the subject to detect the sequence of letters In the experiment, the distance between two flickering stimuli was manipulated.The results showed that the amplitude of the steady-state visual evoked potential generated by the disturbing stimulus was enhanced at the closest focus and suppressed at a longer distance.However, The amplitudes of the steady-state evoked potentials generated by the target flickering stimulus were also unchanged at the three kinds of distances when the disturbing stimulus was located farther away.Therefore, Conventional Attention There is a zone of inhibition around the “spotlight.” In addition, experimental paradigms of steady-state visual evoked potentials provide new avenues for studying the notorious suppression mechanisms.