Pupil response hazard rates predict perceived gaze durations.
Pupil response hazard rates predict perceived gaze durations.
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DOI：
10.1038/s41598-017-04249-9
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发表时间：
2017-06-21
影响因子：
4.6
通讯作者：
Johnston A
中科院分区：
文献类型：
--
作者：
Binetti N;Harrison C;Mareschal I;Johnston A
我们调查的机制，评估知觉注视转移持续时间。时间依赖于内源性生理信号的积累。在这里，我们专注于唤醒，通过瞳孔扩张测量，作为一个候选的定时信号。参与者定时凝视转移标准/探针比较任务中的面部刺激。在标准和探针相同的试验中，根据“较长/较短”判断对学生的反应进行分组。这确保了瞳孔反应反映了内源性唤醒波动，而不是刺激内容的差异。我们发现，瞳孔危险率预测亚秒间隔的分类（更陡的扩张=“更长”的分类）。这表明，内源性唤醒信号的积累通知凝视转移时间判断。我们还发现，参与者完全依赖于第二个刺激来进行分类，在最大不确定性的条件下提供了对时间策略的见解。我们没有观察到分离瞳孔反应时，定时等效的中性空间位移，这表明刺激依赖定时器利用唤醒时间凝视转移。
We investigated the mechanisms for evaluating perceived gaze-shift duration. Timing relies on the accumulation of endogenous physiological signals. Here we focused on arousal, measured through pupil dilation, as a candidate timing signal. Participants timed gaze-shifts performed by face stimuli in a Standard/Probe comparison task. Pupil responses were binned according to “Longer/Shorter” judgements in trials where Standard and Probe were identical. This ensured that pupil responses reflected endogenous arousal fluctuations opposed to differences in stimulus content. We found that pupil hazard rates predicted the classification of sub-second intervals (steeper dilation = “Longer” classifications). This shows that the accumulation of endogenous arousal signals informs gaze-shift timing judgements. We also found that participants relied exclusively on the 2nd stimulus to perform the classification, providing insights into timing strategies under conditions of maximum uncertainty. We observed no dissociation in pupil responses when timing equivalent neutral spatial displacements, indicating that a stimulus-dependent timer exploits arousal to time gaze-shifts.