Do readiness potentials happen all the time?

Area of Science:

• Neuroscience
• Cognitive Science
• Electrophysiology

Background:

• The Readiness Potential (RP) is a known EEG signal preceding voluntary actions.
• Recent theories propose RP may arise from stochastic neural fluctuations, suggesting RP-like events could occur without actions.

Purpose of the Study:

• To investigate if Readiness Potential (RP)-like events are present in EEG data when no voluntary action is produced.
• To test the hypothesis that RP reflects accumulated stochastic neural activity rather than a specific action precursor.

Main Methods:

• Searched background EEG data for events matching the temporal and spatial characteristics of the true RP using template matching.
• Analyzed similarity metrics of RP-like events in epochs with and without subsequent voluntary actions.
• Applied template-search algorithms to simulated EEG data with 1/f noise.

Main Results:

• Numerous RP-like events were detected in EEG epochs, irrespective of whether a voluntary action followed.
• These detected events showed poor spatial or temporal similarity to the true RP, indicating false positives.
• Simulated data demonstrated that RP-like events can be generated by ubiquitous 1/f noise in EEG.

Conclusions:

• The study found no evidence of genuine RP-like events outside the immediate pre-action period.
• The findings do not support a purely stochastic model for RP generation.
• The Readiness Potential likely serves as a specific precursor to self-initiated voluntary actions.