Eye movements are not mandatorily preceded by the N2pc component
Eye movements are not mandatorily preceded by the N2pc component
复制标题
N2pc 成分并不强制出现在眼球运动之前
DOI：
10.1111/psyp.13821
复制
发表时间：
2021
期刊：
影响因子：
3.7
通讯作者：
Gaspelin, Nicholas
中科院分区：
文献类型：
--
作者：
Talcott, Travis N.;Gaspelin, Nicholas
研究人员通常将视觉中的注意选择分为两种机制：显性注意和隐性注意。一个普遍的假设是，在视觉搜索过程中，隐蔽注意力的转移会自动发生在明显的眼球运动之前。虽然N2pc成分被认为是隐蔽注意定向的一个指标，但目前对其与明显眼球运动的关系知之甚少。这是因为之前大多数关于N2pc成分的研究都禁止明显的眼球运动。目前的研究通过同时测量隐性注意力（通过N2pc）和显性眼球运动（通过眼球追踪）来评估这种关系。参与者在显示器上搜索一个横向目标刺激，并在搜索过程中允许产生明显的眼球运动。然后我们评估了N2pc成分是否先于明显的眼球运动。结果表明，扫视之前有N2pc成分，但只有当参与者被要求在开始眼动之前仔细检查目标刺激时才会出现。当参与者被允许在视觉搜索中进行自然的眼球运动时，没有证据表明眼球运动前有N2pc成分。这些发现表明，在视觉搜索过程中，N2pc成分并不总是先于明显的眼球运动。本文讨论了隐性注意和显性注意之间关系的含义。
Researchers typically distinguish between two mechanisms of attentional selection in vision: overt and covert attention. A commonplace assumption is that overt eye movements are automatically preceded by shifts of covert attention during visual search. Although the N2pc component is a putative index of covert attentional orienting, little is currently known about its relationship with overt eye movements. This is because most previous studies of the N2pc component prohibit overt eye movements. The current study assessed this relationship by concurrently measuring covert attention (via the N2pc) and overt eye movements (via eye tracking). Participants searched displays for a lateralized target stimulus and were allowed to generate overt eye movements during the search. We then assessed whether overt eye movements were preceded by the N2pc component. The results indicated that saccades were preceded by an N2pc component, but only when participants were required to carefully inspect the target stimulus before initiating the eye movement. When participants were allowed to make naturalistic eye movements in service of visual search, there was no evidence of an N2pc component before eye movements. These findings suggest that the N2pc component does not always precede overt eye movements during visual search. Implications for understanding the relationship between covert and overt attention are discussed.