Quétard Boris, Quinton Jean Charles, Mermillod Martial, Barca Laura, Pezzulo Giovanni, Colomb Michèle, Izaute Marie
Clermont University, Blaise Pascal University, LAPSCO, Clermont-Ferrand, France CNRS, UMR 6024, LAPSCO, Clermont-Ferrand,
University Grenoble Alpes, LJK, Grenoble, France CNRS, UMR 5224, LJK, Grenoble,
J Vis. 2016 Sep 1;16(11):28. doi: 10.1167/16.11.28.
Visual search can be seen as a decision-making process that aims to assess whether a target is present or absent from a scene. In this perspective, eye movements collect evidence related to target detection and verification to guide the decision. We investigated whether, in real-world scenes, target detection and verification are differentially recruited in the decision-making process in the presence of prior information (expectations about target location) and perceptual uncertainty (noise). We used a mouse-tracking methodology with which mouse trajectories unveil components of decision-making and eye-tracking measures reflect target detection and verification. Indoor scenes were presented, including a target in usual or unusual locations or no target, and were degraded with additive noise (or no noise). Participants had to respond to the target's presence or absence. Degrading the scene delayed the decision due to increased verification times and reduced mouse velocity. Targets in unusual locations delayed the decision and deviated mouse trajectories toward the target-absent response. Detection times played a major role in these effects. Thus, target detection and verification processes influence decision-making by integrating the available sources of information differently and lead to an accumulation of evidence toward both the presence of a target and its absence.
视觉搜索可被视为一个决策过程，其目的是评估场景中是否存在目标。从这个角度来看，眼动收集与目标检测和验证相关的证据以指导决策。我们研究了在现实场景中，在存在先验信息（对目标位置的预期）和感知不确定性（噪声）的情况下，目标检测和验证在决策过程中是否被不同程度地调用。我们使用了一种鼠标跟踪方法，通过该方法鼠标轨迹揭示决策的组成部分，而眼动追踪测量反映目标检测和验证。呈现室内场景，包括目标位于通常或不寻常位置或无目标的情况，并通过加性噪声（或无噪声）进行降质处理。参与者必须对目标的存在或不存在做出反应。由于验证时间增加和鼠标速度降低，场景降质会延迟决策。位于不寻常位置的目标会延迟决策，并使鼠标轨迹偏向目标不存在的反应。检测时间在这些影响中起主要作用。因此，目标检测和验证过程通过以不同方式整合可用信息源来影响决策，并导致朝着目标存在和不存在两个方向积累证据。
