Social priming of hemispatial neglect affects spatial coding: Evidence from the Simon task

Area of Science:

• Cognitive Psychology
• Neuroscience
• Experimental Psychology

Background:

• The Simon effect (SE) demonstrates automatic spatial processing, where response times are faster when stimulus location matches response location.
• Previous research shows social priming can influence automatic processing, such as in the Stroop effect.
• The automaticity of spatial processing in the SE is often assumed to be independent of higher-level cognitive states.

Purpose of the Study:

• To investigate if an observer's mental state can affect spatial coding as measured by the Simon effect.
• To explore the influence of specific cognitive impairments, hemispatial neglect (HN) and achromatopsia (ACHM), on the SE.

Main Methods:

• Two experiments were conducted using social priming manipulations designed to mimic impairments.
• Participants underwent manipulations related to spatial processing (hemispatial neglect) and color perception (achromatopsia).
• The Simon effect was measured in each condition to assess changes in spatial coding.

Main Results:

• The Simon effect was significantly reduced in the "neglected" visual field under the hemispatial neglect manipulation.
• No significant reduction in the Simon effect was observed under the achromatopsia manipulation.
• These findings indicate that spatial coding is influenced by cognitive state.

Conclusions:

• Spatial coding, as measured by the SE, is sensitive to spatial representations influenced by the observer's cognitive state.
• The results challenge stimulus-response interference models that rely on the inherent automaticity of spatial processing.
• Cognitive states can modulate automatic spatial processing, indicating a more complex interaction than previously assumed.