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Separating spatial representations from polarity encoding in the processing of number and sequence stimuli in a
Qiangqiang Wang1, Jiayi Lou1, Mengxia Li1
1School of Teacher Education, Huzhou University, China.
Acta Psychologica
|April 26, 2024
Summary
The spatial numerical association of response codes (SNARC) effect, observed in number and sequence processing, is driven by spatial representation, not polarity encoding. This finding supports the spatial representation theory for magnitude stimuli.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Human-Computer Interaction
Background:
- The spatial numerical association of response codes (SNARC) effect, a well-documented phenomenon in magnitude and sequence processing, has been studied for decades.
- Existing theories propose either spatial representation or polarity encoding as the underlying mechanism for the SNARC effect.
- Ambiguity persists regarding which theory best explains the SNARC effect across different types of stimuli.
Purpose of the Study:
- To investigate whether the SNARC effect in processing numerical and sequential stimuli is primarily due to spatial representation or polarity encoding.
- To differentiate between spatial representation theory and polarity encoding theory using a series of controlled experiments.
- To clarify the cognitive mechanisms underlying the SNARC effect.
Main Methods:
- Five experiments were conducted using a four-way classification task with centrally presented stimuli.
- Stimuli included Arabic numbers, sequential stimuli, ordinal sequences, and Chinese characters lacking inherent spatial information.
- Participants responded to stimuli using a consistent or inconsistent key mapping (A, S, K, L or L, K, S, A).
Main Results:
- The SNARC effect was consistently observed in the processing of Arabic numbers and sequential stimuli, regardless of the mapping complexity (Experiments 1-4).
- Crucially, the SNARC effect was absent when stimuli were Chinese characters, which lack implicit spatial information (Experiment 5).
- These findings indicate a strong reliance on spatial properties for the SNARC effect.
Conclusions:
- The SNARC effect in magnitude processing, encompassing numbers and sequences, is fundamentally rooted in the spatial representation of these stimuli.
- The results provide robust support for spatial representation theory over polarity encoding theory.
- This research clarifies the cognitive basis of the SNARC effect, emphasizing the role of spatial cognition.
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