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Related Concept Videos

Brain Imaging01:14

Brain Imaging

Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
These technologies include computerized axial tomography (CAT or CT scans), positron-emission tomography (PET scans),  magnetic resonance imaging (MRI),  functional magnetic resonance imaging (fMRI), and Transcranial Magnetic Stimulation (TMS).

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Enhancing visual perception by modulating prestimulus alpha and beta power with tRNS.

Jinwen Wei1,2, Huiru Zou2, Qianyuan Tang3

  • 1School of Intelligence Science and Engineering, Harbin Institute of Technology, Shenzhen, Guangdong, China.

Communications Biology
|August 8, 2025
PubMed
Summary
This summary is machine-generated.

Transcranial random noise stimulation (tRNS) can enhance visual perception by modulating brain oscillations, particularly alpha waves, under low mental fatigue. This neuromodulation technique offers a promising avenue for improving sensory processing.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psychophysics

Background:

  • Visual perception is influenced by prestimulus alpha and beta brainwave activity.
  • The causal link between these oscillations and perception requires further investigation.
  • Neuromodulation techniques offer potential for externally influencing brain activity and perception.

Purpose of the Study:

  • To investigate the causal role of alpha and beta oscillations in visual perception.
  • To determine if transcranial random noise stimulation (tRNS) can modulate these oscillations and visual perception.
  • To examine the influence of mental fatigue on tRNS efficacy and brain oscillation modulation.

Main Methods:

  • A sham-controlled, within-subject design was employed with 29 participants.
  • Electroencephalography (EEG) and functional near-infrared spectroscopy (fNIRS) were used during a visual detection task.
  • Transcranial random noise stimulation (tRNS) was applied to modulate cortical excitability, with mental fatigue as a state-dependent factor.

Main Results:

  • tRNS increased online oxyhemoglobin (HbO) amplitude, particularly under low fatigue.
  • tRNS suppressed offline prestimulus alpha and beta power.
  • tRNS reduced the visual contrast threshold (VCT), indicating enhanced visual perception, with alpha power showing greater sensitivity than beta under low fatigue.

Conclusions:

  • tRNS can effectively enhance visual perception by modulating alpha and beta oscillations.
  • The efficacy of tRNS is dependent on the brain's state, specifically the level of mental fatigue.
  • These findings underscore the importance of brain state in neuromodulation and suggest tRNS as a tool for improving sensory processing.