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Operation-Specific Lexical Consistency Effect in Fronto-Insular-Parietal Network During Word Problem Solving.

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Lexical consistency in math word problems affects brain activity, especially for less successful solvers. Inconsistent word problems engage different neural networks for addition versus subtraction.

Keywords:
fMRIinsulalexical consistencymathematical problem solvingnumerical processingposterior parietal cortexprefrontal cortexword problem

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Educational Psychology

Background:

  • Mathematical word problems are common and impact academic achievement.
  • Neural mechanisms underlying word problem solving are not well understood.
  • Lexical consistency in problem descriptions may influence cognitive load and neural responses.

Purpose of the Study:

  • Investigate how lexical consistency modulates brain responses during mathematical word problem solution.
  • Examine the interaction between lexical consistency and arithmetic operations (addition/subtraction).
  • Identify differences in neural engagement between successful and less successful problem solvers.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
  • Participants solved word problems with manipulated lexical consistency (consistent/inconsistent) and operation (addition/subtraction).
  • Key brain regions analyzed included the fronto-insular-parietal network.

Main Results:

  • A significant interaction between consistency and operation was observed in fronto-insular-parietal regions.
  • Inconsistent problems showed stronger activation than consistent problems for addition.
  • The consistency effect was reversed for subtraction, and these effects were more pronounced in less successful solvers.

Conclusions:

  • Lexical consistency effects on arithmetic neural networks are modulated by distinct arithmetic operations.
  • Findings highlight the role of linguistic cues in mathematical reasoning and problem-solving.
  • This research can inform educational strategies for improving math instruction and remediating learning deficits.