Action history influences subsequent movement via two distinct processes

Area of Science:

• Motor control
• Cognitive neuroscience
• Human movement science

Background:

• Goal-directed actions often resemble prior movements.
• The precise mechanisms driving this resemblance, whether solely history-dependent or involving predictive planning, remain unclear.

Purpose of the Study:

• To dissociate the influence of recent movement history from predictive motor planning in action execution.
• To investigate how movement preparation time modulates the effects of past actions on subsequent movements.

Main Methods:

• Manipulated movement initiation time after target specification.
• Studied the impact of predictable movement sequences.
• Systematically dissociated recent movement effects from upcoming movement requirements.

Main Results:

• Directional biases from movement history significantly depend on preparation time, indicating predictive planning's role.
• Predictive biases coexist with a separate bias solely dependent on recent movement history.
• Past experience influences movement via stable, use-dependent processes and dynamic, context-dependent predictive processes.

Conclusions:

• Movement execution is shaped by a combination of direct, use-dependent motor memory and predictive, context-dependent planning.
• Predictive motor planning dynamically evolves and is influenced by preparation time and action history.
• Understanding these dual influences offers insights into motor learning and adaptation.