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Bandpass Sampling

Bandpass Sampling

In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....

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Updated: Jan 17, 2026

Simultaneous Transcranial Alternating Current Stimulation and Functional Magnetic Resonance Imaging

Simultaneous Transcranial Alternating Current Stimulation and Functional Magnetic Resonance Imaging

Published on: June 5, 2017

双焦阿尔法带tACS调节视觉感知中的时间采样.

Alessia Santoni¹, Giuseppe Di Dona¹, Riccardo Gironi²

¹School of Psychology, Vita-Salute San Raffaele University, Milano, Italy; Department of Psychology and Cognitive Science, University of Trento, Rovereto, Italy.

|September 21, 2025

概括

阿尔法振荡调节视觉时间采样. 具体来说,以+2 Hz刺激α频率提高了视觉任务的性能,而-2 Hz则损害了它,揭示了半球差异.

关键词:

无周期性活动.个别的α频率是个别的α频率.非侵入性大脑刺激时间感知时间感知.时间隔离的时间隔离.视觉视觉视觉视觉视觉是一个

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科学领域:

神经科学是一个神经科学.
视觉感知视觉感知视觉感知
大脑的振荡是大脑的振荡.

背景情况:

阿尔法振荡 (7-13 Hz) 与视觉时间处理有关,但证据往往是相关的.
理论上,更快的α频率与更细的时间分辨率相关.
以前关于alpha在时间采样中的作用的发现是不一致的.

研究的目的:

调查视觉时间采样中α振荡的因果作用.
探索跨交替电流刺激 (tACS) 对时间处理的影响.
为了检查半球差异在阿尔法介导的视觉时间采样.

主要方法:

在视觉区域 (V5/MT) 上使用高清tACS,以单个alpha频率 (IAF),IAF+2 Hz或IAF-2 Hz.
参与者执行了两闪的融合任务,以评估时间分离的准确性.
电脑电图 (EEG) 在刺激之前,期间和之后记录了大脑活动.

主要成果:

基线IAF与时间分离精度相关 (更高的IAF=更好的精度).
IAF+2 Hz刺激改善了时间分离,而IAF-2 Hz降低了性能.
影响是对右半球特定的,表明半球专业化.
IAF+2 Hz刺激调节了无周期指数,表明皮层刺激能力的变化.

结论:

阿尔法振荡因果影响视觉时间采样过程.
tACS可以有效调节时间感知,具有特定频率的影响.
结果突出了半球差异和阿尔法介导视觉处理中的潜在短期可塑性机制.