期刊
JOURNAL OF NEUROSCIENCE
卷 41, 期 46, 页码 9581-9592出版社
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.1114-21.2021
关键词
alpha oscillations; signal detection theory; visual detection
资金
- Netherlands Organization for Scientific Research Vidi Grants [NWO 016. Vidi.185.137, 864.14.011]
- Chinese Scholarship Council [CSC20170800036]
- European Union Horizon 2020 Program European Research Council [678286]
This study found that decreasing prestimulus alpha power in the occipital-parietal areas can improve perceptual sensitivity and increase the amount of decodable information from neural activity patterns, indicating that alpha band dynamics modulate sensory signals of interest more strongly than noise.
Alpha activity (8-14 Hz) is the dominant rhythm in the awake brain and is thought to play an important role in setting the internal state of the brain. Previous work has associated states of decreased alpha power with enhanced neural excitability. However, evidence is mixed on whether and how such excitability enhancement modulates sensory signals of interest versus noise differently, and what, if any, are the consequences for subsequent perception. Here, human subjects (male and female) performed a visual detection task in which we manipulated their decision criteria in a blockwise manner. Although our manipulation led to substantial criterion shifts, these shifts were not reflected in prestimulus alpha band changes. Rather, lower prestimulus alpha power in occipital-parietal areas improved perceptual sensitivity and enhanced information content decodable from neural activity patterns. Additionally, oscillatory alpha phase immediately before stimulus presentation modulated accuracy. Together, our results suggest that alpha band dynamics modulate sensory signals of interest more strongly than noise.
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