Department of Ideological and Political Theory Teaching, Maoming Polytechnic, Maoming, Guangdong, 525000, China; School of education, South China Normal University, Guangzhou, Guangdong, 510000, China.
Department of Neurology, Maoming People's Hospital, Maoming, Guangdong, 525000, China.
Physiol Behav. 2024 Oct 15;285:114654. doi: 10.1016/j.physbeh.2024.114654. Epub 2024 Aug 5.
Perception of color as a task-relevant stimulus can affect cognition and behavior in the flanker task; however, it remains unclear whether it has the same impact when it is a task-irrelevant stimulus dimension. To this end, we applied four-letter flanker tasks with or without colored (red/blue) to 23 healthy young adults, while recording the event-related potentials (ERPs) and behavioral performance. The flanker task included four kinds of color types: non-color letter (NC), all color letter (AC), flanker color letter (FC), and target color letter (TC), each flanker task included congruent and incongruent conditions. The behavioral data demonstrated the classic conflict effect across all color types of flanker tasks in both reaction times (RTs) and accuracy, the significant interaction and main effect of color type factors were only observed in accuracy. The ERP results showed significant interaction between conflict factor (congruent, incongruent) and color type (NC, AC, FC, and TC), and the color type factor enhanced the fronto-central P2 (180-200 ms), descended the fronto-centro-parietal N2b (260-320 ms), and increased the fronto-central P3b (360-520 ms). The fronto-central P2 and the fronto-central P3b were larger for TC than NC, AC, and FC in the congruent condition, while the fronto-central P3b was smaller for NC than AC, FC, and TC in the incongruent condition. Furthermore, the fronto-centro-parietal N2b was decreased successively in NC, AC, FC, and TC in both congruent and incongruent conditions. Overall, our findings suggested that the task-irrelevant stimuli dimension of color can capture some attentional resources and is affected by the location of color (target/flanker) and the type of task trial (congruent/incongruent) in the flanker task.
颜色作为一种与任务相关的刺激可以影响到在侧抑制任务中的认知和行为；然而，当它是一种与任务不相关的刺激维度时，它是否有相同的影响还不清楚。为此，我们应用了带有或不带有颜色（红色/蓝色）的四字母侧抑制任务，对 23 名健康的年轻成年人进行了记录，同时记录了事件相关电位（ERP）和行为表现。侧抑制任务包括四种颜色类型：非颜色字母（NC）、全颜色字母（AC）、侧抑制颜色字母（FC）和目标颜色字母（TC），每个侧抑制任务都包括一致和不一致的条件。行为数据表明，在所有颜色类型的侧抑制任务中，都出现了经典的冲突效应，在反应时间（RT）和准确性方面，颜色类型因素的显著交互作用和主要作用都只在准确性方面观察到。ERP 结果显示，冲突因素（一致、不一致）和颜色类型（NC、AC、FC 和 TC）之间存在显著的交互作用，颜色类型因素增强了额中央区的 P2（180-200ms），降低了额中央顶区的 N2b（260-320ms），并增加了额中央区的 P3b（360-520ms）。在一致条件下，TC 的额中央 P2 和额中央 P3b 都大于 NC、AC 和 FC，而在不一致条件下，NC 的额中央 P3b 小于 AC、FC 和 TC。此外，在一致和不一致条件下，额中央顶区的 N2b 依次减少，从 NC、AC、FC 到 TC。总的来说，我们的研究结果表明，颜色作为一种与任务不相关的刺激维度，可以捕获一些注意力资源，并受到颜色位置（目标/侧抑制）和侧抑制任务类型（一致/不一致）的影响。
