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Updated: Feb 24, 2026
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Intracortical Inhibition Within the Primary Motor Cortex Can Be Modulated by Changing the Focus of Attention
Published on: September 11, 2017
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Endogenous spatial attention directed to intracutaneous electrical stimuli on the forearms involves an external
Jorian H G Blom1, Rob H J Van der Lubbe2
1Cognitive Psychology and Ergonomics, University of Twente, The Netherlands.
Summary
Spatial attention to electrical stimuli primarily uses an external reference frame, even when hands are crossed. This suggests attention is guided by external body position rather than internal limb representation.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Somatosensory Processing
Background:
- Understanding spatial attention is crucial for cognitive neuroscience.
- The reference frame for spatial attention (internal somatotopic vs. external body-based) remains debated.
- Investigating attention to somatosensory stimuli provides insights into sensory processing and spatial representation.
Purpose of the Study:
- To determine whether spatial attention to intracutaneous electrical stimuli is organized in an internal or external reference frame.
- To examine the influence of hand position (normal vs. crossed) on attentional processing.
- To elucidate the neural mechanisms underlying spatial attention in different reference frames.
Main Methods:
- Electroencephalogram (EEG) recording during a spatial cueing task.
- Participants attended to intracutaneous electrical stimuli on either the left or right forearm.
- Manipulation of hand position (normal vs. crossed) to create reference frame conflict.
Main Results:
- EEG analyses revealed no reversal of neural activity over central sites when hands were crossed.
- Directional attention-related positivity and increased ipsilateral alpha power were observed in both hand positions.
- Cue validity effects on the P3a component were absent in the crossed-hands condition, indicating altered stimulus processing.
Conclusions:
- Endogenous spatial attention to intracutaneous electrical stimuli predominantly operates within an external reference frame.
- Hand crossing does not necessarily reverse the reference frame for spatial attention to somatosensory stimuli.
- The findings contribute to understanding how the brain integrates sensory information and spatial representations.
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