Disentangling Neural Sources of Problem Size and Interference Effects in Multiplication

Area of Science:

• Cognitive Neuroscience
• Human Psychology

Background:

• Multiplication fact retrieval is primarily memory-based.
• Problem size and interference are key factors affecting retrieval.
• The interplay between problem size and interference requires further investigation.

Purpose of the Study:

• To investigate the unique influences of problem size and interference on performance and neural responses during multiplication fact retrieval in adults.
• To differentiate the contributions of problem size and interference in mental multiplication.

Main Methods:

• Utilized a whole-brain functional magnetic resonance imaging (fMRI) paradigm.
• Isolated multiplication fact retrieval from response selection.
• Analyzed behavioral data (reaction time) and neural responses.

Main Results:

• Both problem size and interference uniquely contributed to reaction time variance, with problem size having a stronger effect in adults.
• fMRI revealed overlapping brain networks modulated by both factors, with problem size being a more dominant modulator.
• Unique contributions of interference were observed in the right angular gyrus and subcortical procedural regions.

Conclusions:

• Problem size is a more dominant factor than interference in driving behavioral and neural responses for adult multiplication fact retrieval.
• Both factors have unique contributions, highlighting the need to consider their overlapping and distinct roles in mental multiplication.
• Findings contrast with previous research in children, suggesting developmental differences in multiplication retrieval strategies.