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Developmental grey matter changes in superior parietal cortex accompany improved transitive reasoning.

Cristián Modroño1, Gorka Navarrete2, Antoinette Nicolle3

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Brain development fine-tunes parietal regions for better transitive reasoning. Adults show higher accuracy due to optimized spatial manipulation skills, supported by synaptic pruning in the superior parietal cortex.

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Cognitive Science

Background:

  • Transitive reasoning, the ability to infer relations between items not directly compared, develops throughout adolescence.
  • The parietal cortex plays a crucial role in spatial processing and reasoning, but its developmental trajectory in transitive reasoning is not fully understood.

Purpose of the Study:

  • To investigate the neural basis of developmental changes in transitive reasoning.
  • To examine the role of the superior parietal cortex in adolescent and adult reasoning abilities.

Main Methods:

  • Voxel-based morphometry (VBM) was used to analyze anatomical magnetic resonance imaging (MRI) scans.
  • Young adolescents and adults completed a transitive reasoning task.

Main Results:

  • Adults demonstrated higher accuracy in transitive reasoning compared to young adolescents.
  • Adults had lower grey matter density in the superior parietal cortex than adolescents, potentially reflecting synaptic pruning.
  • In adolescents, higher grey matter density in the superior parietal cortex correlated with poorer performance, particularly on complex trials requiring spatial manipulation.

Conclusions:

  • Developmental changes in the superior parietal cortex involve fine-tuning for enhanced spatial manipulation.
  • These neural changes contribute to improved accuracy and efficiency in transitive reasoning from adolescence to adulthood.