The Self-Prioritization Effect: Self-referential processing in movement highlights modulation at multiple stages.

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human Movement Science

Background:

• The Self-Prioritization Effect (SPE) demonstrates enhanced performance for self-associated stimuli in cognitive tasks.
• Inconsistent findings exist regarding whether SPE modulates early, late, or multiple stages of information processing.
• A key debate centers on whether SPE solely impacts central processing or influences multiple stages.

Purpose of the Study:

• To investigate if the self-advantage in arm movements is due to response bias or approach motivation.
• To determine the specific processing stages influenced by self-relevance in motor responses.
• To differentiate between single-stage (central) and multiple-stage modulation theories of SPE.

Main Methods:

• Experiment 1: Used a ballistic movement-time task with occluded visual feedback to test response bias.
• Experiment 2: Employed a task requiring responses directed away from stimuli to examine approach motivation.
• Both experiments utilized a shape-label matching task involving self- and other-person-associated stimuli.

Main Results:

• The self-advantage in arm-movement responses persisted even without visual feedback (Experiment 1).
• The self-advantage remained when responses were directed away from stimuli, ruling out simple approach motivation (Experiment 2).
• Findings suggest self-relevance modulates movement responses via proprioceptive, kinaesthetic, and tactile feedback.

Conclusions:

• The self-advantage in arm movements is robust and not dependent on visual feedback or simple response direction.
• Self-relevance influences motor responses through multiple processing stages, challenging theories of central-stage-only modulation.
• This research supports a broader role for self-relevance in modulating action and perception across various sensory modalities.