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Published on: November 28, 2025
Alcohol consumption and handwriting: a kinematic analysis
James G Phillips1, Rowan P Ogeil, Friedemann Müller
1School of Psychology, Psychiatry and Psychological Medicine, Monash University, Clayton VIC 3800, Australia. Jim.phillips@med.monash.edu.au
Alcohol intoxication induces cerebellar dysfunction symptoms, observable in handwriting. This study found alcohol-dependent individuals exhibit less ballistic handwriting compared to non-dependent participants.
Area of Science:
- Neuroscience
- Human Physiology
- Toxicology
Background:
- Cerebellar dysfunction impacts motor control, affecting movement extent, acceleration, deceleration, and tremor.
- Handwriting analysis offers a potential method to detect subtle neurological changes.
Purpose of the Study:
- To investigate if cerebellar dysfunction symptoms manifest in the handwriting of individuals intoxicated with alcohol.
- To compare handwriting characteristics between alcohol-dependent and non-alcohol-dependent individuals post-alcohol consumption.
Main Methods:
- Twenty participants (alcohol-dependent and non-alcohol-dependent) wrote cursive letter 'l's on a graphics tablet.
- Kinematic analysis was performed on handwriting samples before and after controlled alcohol consumption (peak BAC 0.048%).
Main Results:
- A correlation was observed between blood alcohol concentration and handwriting stroke length.
- Kinematic analysis revealed increased time spent in acceleration and elevated spectral power around 4Hz during intoxication.
- Alcohol-dependent individuals demonstrated less ballistic handwriting than non-alcohol-dependent participants.
Conclusions:
- Alcohol intoxication elicits observable symptoms of cerebellar dysfunction in handwriting.
- Handwriting kinematic analysis can serve as a sensitive indicator of alcohol-induced neurological effects.
- Differences in handwriting suggest distinct motor control adaptations in alcohol-dependent individuals.
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