Modulation of Emotional Category Induced by Temporal Factors in Emotion Recognition.
Modulation of Emotional Category Induced by Temporal Factors in Emotion Recognition.
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DOI：
10.1371/journal.pone.0131636
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Okanoya K
中科院分区：
文献类型：
--
作者：
Maeshima H;Yamashita Y;Fujimura T;Okada M;Okanoya K
范畴知觉（CP）是人类认知中信息加工的最显著特征之一，它是将连续的感觉现象感知为不同的、独立的知觉的知觉经验。CP被认为是自上而下的加工（包括背景知识和语言标记）和自下而上的加工（如感官信号的物理特征）相结合的结果。然而，管理集成的潜在机制仍然不清楚。为了解决这一问题，我们重点研究了面部表情CP的时间特征。在本研究中，我们以面部表情识别任务为例，研究了时间因素对CP过程的贡献。被试完成了一个识别任务和一个区分任务，这是评估面部表情CP的既定任务，具有可变的时间参数，即刺激呈现的持续时间和延迟时间（刺激与反应之间的时间间隔）。结果表明，情绪模糊刺激的分类与延迟时间的延长有关，而与刺激时间的延长无关。相比之下，面部表情的类别边界随着刺激持续时间的延长而向“快乐”方向移动，而不是延迟长度的延长。刺激持续时间和延迟影响之间的分离表明有两个过程对面部情绪的CP起作用；一个过程可能反映与延迟期长度相关的内部加工，包括刺激的言语标记，另一个过程可能反映与刺激持续时间相关的刺激输入的时间总和。这些发现表明，更多地关注CP的时间因素可能有助于进一步研究CP的机制。
Categorical perception (CP), the perceptual experience whereby continuous sensory phenomena are perceived as distinct and separate percepts, is one of the most characteristic features of information processing in human cognition. CP is considered as the result of the integration of the top-down processing including background knowledge and verbal labeling and the bottom-up processing such as physical characteristics of the sensory signal. However, the underlying mechanisms governing the integration remain unclear. To address this issue, we focused on the temporal characteristics of CP of facial expression. In the current study, we investigated the contributions of temporal factors in CP processes, using facial expression recognition tasks as an example of CP. Participants completed an identification task and a discrimination task, well-established tasks for evaluating CP of facial expressions, with variable temporal parameters, that is, duration of stimulus presentation and delay time (interval between stimulus and response). The results demonstrated that the emotionally ambiguous stimuli are categorized more distinctively with the extension of delay length, not of stimulus duration. In contrast, the category boundary for facial expressions shifted toward “happy” with extention in stimulus duration, not in delay length. This dissociation between the impact of stimulus duration and delay suggests that there are two processes contributing to CP of facial emotion; one process may reflect the internal processing associated with the length of the delay period including verbal labeling of the stimuli, and the other process may reflect the temporal summation of stimulus inputs, associated with stimulus duration. These findings suggest that paying more attention to temporal factors in CP could be useful for further study of the mechanisms underlying CP.