Dissociations between motor-related EEG measures in a cued movement sequence task

Area of Science:

• Cognitive Neuroscience
• Motor Control
• Electrophysiology

Background:

• Cognitive preparation involves knowing what to do and effectively executing it.
• Previous research on task switching showed dissociations in brain activity related to preparation.
• Movement sequence preparation may exhibit similar dissociations.

Purpose of the Study:

• To investigate if different electroencephalogram (EEG) measures show dissociations in preparing movement sequences.
• To explore how precueing parts of a movement sequence affects brain activity.
• To compare preparation aspects with findings from task switching studies.

Main Methods:

• Participants performed a cued movement sequence task with varying levels of precue information.
• EEG was recorded, analyzing lateralized readiness potential (LRP), beta-band event-related desynchronization, and phase locking.
• Cues indicated the full sequence, the first element, the second element, or no element.

Main Results:

• Knowing the first movement cue was enough to lateralize phase locking patterns.
• Lateralized readiness potential (LRP) and lateralized amplitude effects were observed only when the full sequence was known.
• This suggests full preparation of the first response occurs only with complete sequence knowledge.

Conclusions:

• Different aspects of cognitive control in movement preparation are reflected in distinct EEG measures.
• Phase locking relates to response foreknowledge, while evoked potentials reflect the transformation of foreknowledge into action.
• Findings support the importance of considering diverse brain activity measures for understanding cognitive control.