Time Pressure Modulates Electrophysiological Correlates of Early Visual Processing
Time Pressure Modulates Electrophysiological Correlates of Early Visual Processing
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DOI：
10.1371/journal.pone.0001675
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发表时间：
2008-02-27
期刊：
影响因子：
3.7
通讯作者：
Herrmann, Christoph S.
中科院分区：
文献类型：
--
作者：
Fruend, Ingo;Busch, Niko A.;Herrmann, Christoph S.
背景：对感官事件的反应有时需要快速的反应，而在其他时候，它们需要高度的准确性——通常导致反应较慢。了解不同反应速度要求下的视觉加工是否采用不同的神经机制是很重要的。方法/主要发现：我们要求参与者将不同细节水平的视觉模式分类为真实世界的物体或无意义的物体。在一种情况下，参与者被要求立即做出反应，而在另一种情况下，他们在延迟1秒后做出反应。正如预期的那样，参与者在延迟反应试验中表现得更准确。这种效应在具有高水平细节的刺激中很明显。这些行为效应伴随着刺激相关的脑电图伽马振荡的调节，这是早期视觉处理的电生理相关。在需要快速反应的试验中，早期的刺激锁定振荡区分了真实世界和无意义的物体，而不考虑细节水平。对于具有较高细节水平的刺激，在较晚的时间窗口中的振荡功率区分真实世界和非感官物体，而不考虑响应速度要求。结论/意义：因此，假设不同的反应速度要求触发不同的加工动态似乎是合理的。
Background: Reactions to sensory events sometimes require quick responses whereas at other times they require a high degree of accuracy-usually resulting in slower responses. It is important to understand whether visual processing under different response speed requirements employs different neural mechanisms.Methodology/Principal Findings: We asked participants to classify visual patterns with different levels of detail as real-world or non-sense objects. In one condition, participants were to respond immediately, whereas in the other they responded after a delay of 1 second. As expected, participants performed more accurately in delayed response trials. This effect was pronounced for stimuli with a high level of detail. These behavioral effects were accompanied by modulations of stimulus related EEG gamma oscillations which are an electrophysiological correlate of early visual processing. In trials requiring speeded responses, early stimulus-locked oscillations discriminated real-world and non-sense objects irrespective of the level of detail. For stimuli with a higher level of detail, oscillatory power in a later time window discriminated real-world and non-sense objects irrespective of response speed requirements.Conclusions/Significance: Thus, it seems plausible to assume that different response speed requirements trigger different dynamics of processing.