Feeling the force: returning haptic signals influence effort inference during motor coordination.

Area of Science:

• Neuroscience
• Motor Control
• Human-Computer Interaction

Background:

• The brain automatically optimizes effort during motor coordination tasks.
• Previous models assumed effort is solely inferred from motor commands.
• Understanding effort inference is key to explaining motor coordination.

Purpose of the Study:

• To investigate how the brain infers effort expenditure during motor tasks.
• To challenge the existing belief that motor commands are the sole source of effort information.
• To identify the role of sensory feedback in effort inference.

Main Methods:

• Conducted experiments involving a force sharing task.
• Utilized computational simulations to analyze experimental data.
• Investigated the contribution of both motor commands and haptic signals.

Main Results:

• Demonstrated that haptic signals are crucial for inferring effort, alongside motor commands.
• Showed that the brain does not solely rely on motor commands for effort estimation.
• Identified a previously unknown sensory-motor association in effort inference.

Conclusions:

• Haptic feedback plays a significant role in the brain's effort expenditure optimization.
• This finding necessitates a revision of existing motor coordination models.
• Results offer insights into how sensory changes (e.g., ergonomics, disease) impact motor control.