早期阿尔法功率下降反映了感知预期。

IF 3.1 3区 医学 Q2 NEUROSCIENCES
Szabolcs Sáringer;Ágnes Fehér;Gyula Sáry;Péter Kaposvári
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引用次数: 0

摘要

刺激的可预测性可以用其过渡概率来描述。在对预期刺激和意外刺激的神经反应进行比较时,发现根据刺激的过渡概率得出的知觉预期会调节大脑感觉区域的早期α振荡。我们研究的目的是找出这种低频振荡在多大程度上反映了刺激的可预测性。我们的目的是通过比较预期刺激和中性刺激,检测过渡概率差异较小的阿尔法功率差异。我们通过无监督视觉统计学习范式,在图像序列中嵌入预期刺激和中性刺激,同时记录脑电图,研究了预期对感知的影响。时频分析表明,预期刺激会在刺激呈现后的 8-12 赫兹和 0-400 毫秒内引起较低的α功率,出现在顶叶中央区。将以往基于预期的阿尔法波段调制研究结果与我们的研究结果进行比较后发现,早期阿尔法振荡与刺激的可预测性呈反比关系。虽然目前的数据不足以确定α功率降低的原因,但这可能是皮层振荡活动中预期抑制的潜在迹象。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Perceptual Expectations Are Reflected by Early Alpha Power Reduction
The predictability of a stimulus can be characterized by its transitional probability. Perceptual expectations derived from the transitional probability of the stimulus were found to modulate the early alpha oscillations in the sensory regions of the brain when neural responses to expected versus unexpected stimuli were compared. The objective of our study was to find out the extent to which this low-frequency oscillation reflects stimulus predictability. We aimed to detect the alpha-power difference with smaller differences in transitional probabilities by comparing expected stimuli with neutral ones. We studied the effect of expectation on perception by applying an unsupervised visual statistical learning paradigm with expected and neutral stimuli embedded in an image sequence while recording EEG. Time–frequency analysis showed that expected stimuli elicit lower alpha power in the window of 8–12 Hz and 0–400 msec after stimulus presentation, appearing in the centroparietal region. Comparing previous findings of expectancy-based alpha-band modulation with our results suggests that early alpha oscillation shows an inverse relationship with stimulus predictability. Although current data are insufficient to determine the origin of the alpha power reduction, this could be a potential sign of expectation suppression in cortical oscillatory activity.
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来源期刊
Journal of Cognitive Neuroscience
Journal of Cognitive Neuroscience 医学-神经科学
CiteScore
5.30
自引率
3.10%
发文量
151
审稿时长
3-8 weeks
期刊介绍: Journal of Cognitive Neuroscience investigates brain–behavior interaction and promotes lively interchange among the mind sciences.
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