Neural Competitive Queuing of Ordinal Structure Underlies Skilled Sequential Action

Area of Science:

• Neuroscience
• Cognitive Science
• Motor Control

Background:

• Fluent movement sequence execution is vital for daily life.
• Neural mechanisms for sequence planning are not fully understood.

Purpose of the Study:

• To investigate the neural basis of movement sequence planning in humans.
• To identify how the brain represents and prepares sequential actions.

Main Methods:

• Participants learned and reproduced finger press sequences.
• Magneto-encephalography (MEG) recorded brain activity during sequence production.
• MEG patterns were classified to analyze neural representations of each action and its timing.

Main Results:

• Demonstrated "competitive queuing" (CQ) of upcoming action representations in humans using non-invasive MEG.
• CQ reflects an ordinal template generalizing across different motor actions based on their sequence position.
• CQ predicted participants' accuracy and was linked to parahippocampal and cerebellar activity.

Conclusions:

• The brain employs CQ for learning and controlling multiple movement sequences.
• Sequence control involves flexible integration of action-specific representations, timing, and abstract positional information.
• Findings extend computational models and non-human primate studies to human non-invasive recordings.