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Environmentally defined frames of reference: their time course and sensitivity to spatial cues and attention
S Danziger1, A Kingstone, R Ward
1School of Psychology, University of Wales, Bangor, Gwynedd, United Kingdom. shaidanz@nihul.bgu.ac.il
Summary
This study on the Simon task reveals that spatial coding uses multiple reference frames and is unaffected by attention shifts. Object-based spatial coding persists even when responses are no longer activated.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Human Perception
Background:
- The Simon task is a widely used paradigm to investigate stimulus-response compatibility.
- Understanding spatial stimulus coding is crucial for cognitive and computational models of perception and action.
Purpose of the Study:
- To explore the influence of spatial cues and attention on spatial stimulus coding within a Simon task.
- To determine the reference frames used for spatial coding.
- To investigate the role of attention in spatial coding and the persistence of object-based coding.
Main Methods:
- Participants performed a speeded response Simon task.
- Peripheral spatial cues preceded target arrows indicating response direction.
- Cue validity and target presentation (peripheral vs. central) were systematically varied.
- Response times and accuracy were recorded.
Main Results:
- Target stimuli are coded using multiple reference frames.
- Shifting attention to the target does not alter its spatial coding.
- Object-based spatial coding is maintained even when the object no longer elicits a direct response.
Conclusions:
- Spatial coding is a complex process involving multiple reference frames.
- Attention does not directly modulate the spatial coding of targets.
- Object-based representations play a lasting role in spatial coding, influencing perception beyond immediate response activation.