連続した視覚探索は随伴陰性変動の振幅を減少させる

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  • Continuous visual search decreases the amplitude of contingent negative variation
  • レンゾク シタ シカク タンサク ワ ズイハン インセイ ヘンドウ ノ シンプク オ ゲンショウ サセル

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<p>  We investigated the effects of continuous visual search (CVS) on visual attentional function by using the amplitude of contingent negative variation (CNV) as the index. Ten subjects of our experiment performed the Posner cueing task (PCT) before and after CVS. We used the Advanced Trail Making Test Random Task for the CVS. In this task, we made each subject click circled numbers from 11 to 40 in numerical order. Once a circled number was clicked, it disappeared, and another circle with the clicked number plus 30 showed up on the screen. In this task, all of the circles were rearranged at random, and 30 circles were on the screen at any time. Each subject performed the task 40 times. In the PCT, an up- or down-pointing arrow was shown at the center of the display as the warning stimulus (S1). A square target as the imperative stimulus (S2) subsequently appeared above or below the central cue. When the directions of S1 and S2 corresponded, each subject was required to respond by pressing the joystick button with his right thumb. Each subject performed the task 80 times. PCT performances were compared before and after CVS along with early and late CNV amplitude recorded from Cz. The results showed that PCT reaction time was delayed after CVS, the late CNV amplitude decreased. These results suggest that attentional functions are impaired, with reduced activity in brain networks associated with top-down attentional control, which is induced by continuous visual search.</p>

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