Slightly perturbing the arm influences choices between multiple targets.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Motor Control

Background:

• Humans make constant choices about interacting with objects.
• Background motion influences goal-directed hand movements.
• The role of posture changes in decision-making is not fully understood.

Purpose of the Study:

• To investigate if background motion, affecting posture, influences choices between movement options.
• To determine if proprioceptive feedback from postural shifts impacts target selection.

Main Methods:

• Participants performed a target-tapping task within a time limit.
• A moving background induced subtle finger shifts before targets split into two options.
• Choices between the two targets were recorded and analyzed.

Main Results:

• Moving backgrounds caused finger movements consistent with the motion direction.
• Participants preferentially chose targets aligned with the background motion direction.
• A correlation was found between response to motion and choice bias.

Conclusions:

• Sudden changes in posture are considered when selecting between movement options.
• Proprioceptive information from postural adjustments influences motor decisions.
• This suggests an integration of sensory and motor information in choice behavior.