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Updated: Feb 9, 2026
10:51
Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans
Published on: January 15, 2018
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Dynamics of directional tuning and reference frames in humans: A high-density EEG study.
Hirokazu Tanaka1, Makoto Miyakoshi2, Scott Makeig2
1School of Information Science Japan, Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa, 923-1292, Japan. hirokazu@jaist.ac.jp.
Scientific Reports
|May 31, 2018
Summary
High-density electroencephalography (EEG) reveals how the brain encodes upper-limb reaching movements. Neural activity shows directional tuning and shifts based on posture, extending beyond sensorimotor areas.
Area of Science:
- Neuroscience
- Motor Control
- Brain-Computer Interfaces
Background:
- Advancements in electroencephalography (EEG) enable naturalistic movement recording.
- EEG offers a non-invasive method to study neural mechanisms of motor control.
Purpose of the Study:
- To investigate how EEG dynamics encode finger movement direction and posture dependence during reaching tasks.
- To explore directional selectivity of EEG sources across the brain.
Main Methods:
- High-density EEG recorded during eight-directional, center-out reaching movements.
- Representational Similarity Analysis applied to time-domain EEG signals.
- Analysis of directional tuning and posture-dependent shifts in neural activity.
Main Results:
- A majority of brain sources showed significant directional tuning during movement.
- Directional tuning curves systematically shifted with shoulder angle changes.
- Tuning curve shifts were intermediate between extrinsic and shoulder-based reference frame models.
Conclusions:
- High-density EEG allows non-invasive study of motor control neural dynamics in humans.
- Directional sensitivity in neural processing extends to whole-brain areas, not just sensorimotor regions.
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