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Frontal hemispheric differences in the Bereitschaftspotential associated with writing and drawing
Human Neurobiology
|January 1, 1983
Summary
This study explored brain activity during complex actions like writing and drawing. The readiness potential (BP) showed distinct onset times and frontal lobe activity, differing between verbal and spatial tasks.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Motor Control
Background:
- The readiness potential (BP) is a well-studied electrophysiological signal preceding voluntary movement.
- Understanding BP generation during complex, non-habitual actions is crucial for cognitive neuroscience.
Purpose of the Study:
- To investigate the cerebral potentials, specifically the readiness potential (BP), associated with complex actions.
- To compare BP onset, topography, and hemispheric differences during signature writing, pentagram drawing, and scribbling.
Main Methods:
- Electroencephalography (EEG) was used to record cerebral potentials in 20 subjects.
- Subjects performed three complex motor tasks: signature writing, pentagram drawing, and fast meaningless scribbling.
- Analysis focused on BP onset latency, scalp topography, and hemispheric differences.
Main Results:
- BP onset varied across tasks: 3s for writing, 2.5s for drawing, 1.5s for scribbling.
- The supplementary motor area (SMA) showed the earliest BP onset in all tasks.
- Frontal lobe activity was more pronounced than for simple finger movements, with task-specific hemispheric differences (left for writing, right for drawing).
Conclusions:
- Complex actions elicit distinct BP characteristics compared to simple movements.
- BP generation during complex tasks involves specific frontal cortical networks, with lateralization reflecting task demands (verbal vs. spatial).
- The SMA plays a key role in initiating complex voluntary movements.