Repetition and the SNARC effect with one- and two-digit numbers
1Department of Psychology, University of Alberta, Canada.
Summary
The Spatial Numerical Association of Response Codes (SNARC) effect, linking number size to response location, disappears with identical repeated stimuli for single digits. However, this repetition effect on SNARC is not observed with two-digit numbers.
Area of Science:
- Cognitive Psychology
- Numerical Cognition
- Human-Computer Interaction
Background:
- The Spatial Numerical Association of Response Codes (SNARC) effect demonstrates a link between numerical magnitude and spatial response codes.
- This effect suggests that number processing involves activating left-right magnitude-laterality codes that interact with response selection.
- Previous research has explored factors influencing the SNARC effect, but the impact of stimulus repetition requires further investigation.
Purpose of the Study:
- To investigate the influence of stimulus repetition on the SNARC effect in parity decision tasks.
- To compare the effects of repetition on the SNARC effect for single-digit versus two-digit numbers.
- To explore the role of magnitude-laterality code activation and potential short-circuiting mechanisms in number processing.
Main Methods:
- Participants performed parity judgments on one-digit numbers (Experiment 1) and two-digit numbers (Experiment 2).
- The study manipulated stimulus repetition, presenting identical or non-identical stimuli on successive trials.
- Response times and accuracy were recorded to assess the SNARC effect under different repetition conditions.
Main Results:
- For single-digit numbers, response times were faster, and the SNARC effect was eliminated when stimuli were identical on successive trials.
- For two-digit numbers, responses were faster when the ones digit was repeated, but the SNARC effect persisted regardless of repetition.
- The findings suggest that stimulus repetition can short-circuit the activation of magnitude-laterality codes for simple number access.
Conclusions:
- The SNARC effect is sensitive to stimulus repetition, particularly when identical stimuli are presented consecutively for single-digit numbers.
- The lack of a repetition effect on the SNARC effect for two-digit numbers indicates more complex processing or different activation patterns.
- These results support the model where number magnitude-laterality codes are activated during number processing, and this activation can be bypassed by direct stimulus matching.
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