Differences in working memory coding of biological motion attributed to oneself and others

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neuroimaging

Background:

• Understanding self/other distinctions is crucial in neuroscience and philosophy.
• Previous studies on self-reference and movement are limited by familiarity confounds.

Purpose of the Study:

• To identify neural substrates distinguishing self- versus other-associated full-body movements.
• To investigate brain regions involved in representing movement ownership using arbitrary associations.

Main Methods:

• Functional magnetic resonance imaging (fMRI) with a delayed match-to-sample working memory task.
• Point-light walker stimuli to represent full-body movements.
• Searchlight multivariate decoding analysis to identify information coding.

Main Results:

• Movement-specific patterns were found in perceptual processing networks, excluding early sensory areas.
• Self- versus other-movement association was coded in left middle frontal gyrus (MFG), left inferior frontal gyrus (IFG), and supplementary motor area.
• Increased activity in ventral medial prefrontal cortex correlated with retaining self-associated movements.

Conclusions:

• The brain utilizes specific regions like MFG, IFG, and TPJ for self/other distinctions in movement representation.
• Arbitrary associations effectively dissociate self-reference from movement familiarity.
• Ventral medial prefrontal cortex plays a role in self-associated movement retention.