Agent identity drives adaptive encoding of biological motion into working memory

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human Motion Analysis

Background:

• Working memory (WM) is crucial for social interaction, requiring encoding of human biological motions (BMs).
• BMs carry unique agent identities, but their influence on WM processing is unknown.
• Understanding WM's capacity for motion and identity is key to social cognition.

Purpose of the Study:

• To investigate if agent identity affects the WM processing of BMs.
• To determine if WM encodes BMs as individual elements or as complete events, including identity-linked details.
• To test hypotheses on whether WM stores only actions or actions plus irrelevant attributes like clothing color.

Main Methods:

• Participants memorized BMs performed by single or multiple agents, while ignoring clothing colors.
• A distraction paradigm probed WM content by assessing the impact of irrelevant color changes on action recall.
• Experiments manipulated agent identity, memory load, and probe identity to analyze WM encoding strategies.

Main Results:

• WM encoding of BMs is adaptive and influenced by agent identity.
• When BMs had distinct identities, WM adopted an event-based encoding mode, storing irrelevant colors.
• When BMs shared the same identity or were inverted, WM used an element-based mode, ignoring colors.

Conclusions:

• Agent identity significantly impacts WM processing of biological motions.
• WM dynamically adjusts its encoding strategy based on the perceived distinctiveness of individuals performing actions.
• This suggests WM integrates identity information into motion representations for effective social cognition.