Humans are constantly enacting motor responses based on perceptual judgments or decisions. Recent work suggests that accumulating evidence for a decision and planning the action to enact the decision are coupled. Further, decision commitment may occur when the action reaches its motor threshold. Across several experiments, this coupled perception-action account of perceptuomotor decision making was tested by determining if increasing response activation corresponding to one decision influenced the evidence needed to make that decision. Participants were presented with stimuli that contained varying ratios of yellow-to-blue squares and made a speeded left/right-hand response to report whether the stimulus had more yellow or blue squares, respectively. Response activation was modulated by presenting stimuli laterally on the screen-spatially compatible or incompatible with the color reports. When stimuli appeared leftward (spatially compatible with a left response/"yellow" report), the threshold for a "yellow" perceptuomotor decision was reduced-consistent with the hypothesis that increasing "yellow" response activation would lead to a "yellow" reporting bias. Further, when stimuli appeared rightward (spatially compatible with a right response/"blue" report), the threshold for a "blue" perceptuomotor decision was reduced. An additional experiment revealed that directional saccades occurring during the task were unlikely to account for biases. Overall, spatially induced response activation influenced the decision outcomes, providing support for a tightly coupled perception-action system underlying perceptuomotor decisions. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

中文翻译：

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反应激活的调节会导致知觉运动决策的偏差。

人类不断地根据感知判断或决定做出运动反应。最近的研究表明，积累决策证据和规划实施决策的行动是相结合的。此外，当动作达到其运动阈值时，可能会发生决策承诺。通过几个实验，通过确定与一个决定相对应的反应激活的增加是否影响做出该决定所需的证据来测试这种感知运动决策的耦合感知-行动解释。向参与者提供包含不同比例的黄蓝方块的刺激，并做出快速的左/右手反应，以分别报告刺激是否有更多的黄色或蓝色方块。通过在屏幕上横向呈现刺激来调节反应激活——与颜色报告在空间上兼容或不兼容。当刺激向左出现时（在空间上与左侧反应/“黄色”报告兼容），“黄色”感知运动决策的阈值降低，这与增加“黄色”反应激活会导致“黄色”报告偏差的假设一致。此外，当刺激出现在右侧（在空间上与正确反应/“蓝色”报告兼容）时，“蓝色”感知运动决策的阈值降低。另一项实验表明，任务期间发生的定向扫视不太可能解释偏差。总体而言，空间诱发的反应激活影响了决策结果，为感知运动决策背后的紧密耦合的感知-行动系统提供支持。（PsycInfo 数据库记录 (c) 2023 APA，保留所有权利）。