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Published on: August 28, 2021
Dissociations within arithmetic rules: Different neural bases and solution processes in zero and one multiplications.
Silvia Benavides-Varela1, Antonino Vallesi2, Luca Weis3
1Department of Developmental Psychology and Socialisation, University of Padova, Padova, Italy; Padova Neuroscience Center, University of Padova, Padova, Italy.
Zero and One single-digit multiplications involve distinct cognitive processes, not a single rule. Behavioral and neural data reveal unique solution strategies for these basic arithmetic facts.
Area of Science:
- Cognitive Neuroscience
- Mathematical Cognition
- Human Brain Imaging
Background:
- Single-digit multiplications by Zero and One are often excluded from arithmetic studies, assumed to be solved by simple rule retrieval.
- There is limited empirical evidence to support the hypothesis that Zero and One multiplications constitute a homogeneous group solved by a unified strategy.
Purpose of the Study:
- To compare behavioral and neural responses during the solution of Zero, One, and other single-digit multiplications (Facts) in young adults.
- To investigate whether Zero and One multiplications engage distinct cognitive and neural mechanisms.
Main Methods:
- An event-related functional magnetic resonance imaging (fMRI) study was conducted with 21 healthy participants performing an arithmetic verification task.
- Univariate analyses and Representational Similarity Analysis (RSA) of fMRI-BOLD signals were employed to compare activation patterns.
- Behavioral data (reaction times, error rates) were collected alongside neural data.
Main Results:
- Participants exhibited slower reaction times and higher error rates for Zero compared to One multiplications.
- fMRI data revealed greater activation in the right precuneus for Zero versus One multiplications, potentially indicating increased abstraction and attentional shifts.
- RSA demonstrated distinct activation patterns for standard multiplication facts in known arithmetic areas (inferior/middle frontal gyrus, superior parietal lobule) and identified the right precuneus's capacity to differentiate between Zero and One multiplication processing.
Conclusions:
- Behavioral and neural evidence supports the view that Zero and One multiplications are solved using distinct processes.
- These findings challenge the notion of a single, unified rule-based strategy for these basic arithmetic operations.
- The right precuneus appears to play a role in distinguishing between the cognitive mechanisms underlying Zero and One multiplication.
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