Same action in different spatial locations induces selective modulation of body metric representation

Area of Science:

• Neuroscience
• Cognitive Psychology
• Motor Control

Background:

• Body representation is thought to be influenced by the functional demands of actions.
• Different body parts typically operate within distinct peripersonal spaces, performing specialized functions.

Purpose of the Study:

• To investigate the direct relationship between body representation and the spatial context of action execution.
• To determine if motor training in varied spatial environments alters body perception.

Main Methods:

• A modified body image task was employed to assess body representation.
• Participants underwent a sorting task training in two distinct spatial contexts: a table and the floor.
• Body representation was measured before and after the training intervention.

Main Results:

• A significant recalibration of perceived upper arm length was observed after motor task training on the floor.
• This modulation extended beyond the actively used limbs to include the torso, indicating a broader effect on upper body representation.

Conclusions:

• Body representation is dynamically modulated by motor training and the specific spatial environment where actions occur.
• These findings suggest that body schema adjusts to enhance action capabilities within a given spatial context.
• The extension of modulation to non-acting body parts highlights the maintenance of a functionally coherent body representation.