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Updated: Feb 9, 2026

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Alpha suppression during non-painful tactile stimulation.

Çağdaş Güdücü1, Güliz Akın Öztürk2, Zehra Ülgen2

  • 1Dokuz Eylül University, Faculty of Medicine, Department of Biophysics, 35340 Balcova, Izmir, Turkey; Dokuz Eylül University, Health Sciences Institute, Department of Sleep and Conscious States, 35340 Balcova, Izmir, Turkey.

Brain Research
|February 7, 2026
PubMed
Summary

Alpha-band power, a marker for brain processing, changes with tactile stimulation intervals. Longer intervals (8s) showed highest alpha activity, suggesting altered sensory processing and brain states.

Keywords:
Alpha-band powerElectroencephalographyInter stimulus intervalNon-painful tactile stimulation

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Area of Science:

  • Neuroscience
  • Sensory Processing
  • Electrophysiology

Background:

  • Alpha-band power is a key indicator of cortical states related to sensory processing, including suppression and temporal organization.
  • Understanding how brain activity adapts to varying sensory input timing is crucial for deciphering neural mechanisms.

Purpose of the Study:

  • To investigate the modulation of alpha-band power in electrophysiological brain responses by different interstimulus intervals (ISIs) during repetitive tactile stimulation.
  • To determine how varying ISIs (2s, 4s, 8s) influence alpha activity in specific brain regions (frontal, central, parietal).

Main Methods:

  • Non-painful tactile stimuli were applied to the index finger using a pneumatic stimulator with ISIs of 2, 4, and 8 seconds.
  • Electroencephalogram (EEG) was recorded from 24 volunteers across separate sessions for each ISI, presented in a pseudorandomized order.

Main Results:

  • Alpha activity was lowest at the 4s ISI and highest at the 8s ISI, consistently observed in central and parietal regions.
  • The frontal region showed pronounced alpha activity during the 4s ISI, while the central region exhibited the highest alpha activity during the 8s ISI.
  • A distinct pattern of alpha activity was observed across frontal, central, and parietal areas depending on the ISI.

Conclusions:

  • Interstimulus intervals significantly impact inhibitory control and sensory processing within the brain.
  • The frontal cortex demonstrates efficient attention and cognitive control at intermediate intervals (4s ISI).
  • The central brain region shows increased involvement in processing tactile inputs at longer intervals (8s ISI).