Commonalities for numerical and continuous quantity skills at temporo-parietal junction

Area of Science:

• Cognitive Neuroscience
• Neurobiology
• Developmental Psychology

Background:

• Investigating the relationship between numerical cognition and the processing of continuous quantities like time and space is crucial.
• Existing research presents conflicting evidence regarding shared versus distinct neural resources for magnitude processing.

Purpose of the Study:

• To determine the relationship between number, time, and space processing.
• To examine these relationships in individuals with developmental dyscalculia and in neurotypical adults.

Main Methods:

• Assessed continuous quantity processing in individuals with developmental dyscalculia.
• Examined behavioral and anatomical correlations between numerical and continuous quantity abilities in neurotypical adults.
• Utilized neuroimaging techniques to investigate gray matter volume in relation to these cognitive functions.

Main Results:

• Individuals with developmental dyscalculia demonstrated preserved continuous quantity processing.
• Numerical and continuous quantity abilities were behaviorally and anatomically dissociated in neurotypical adults.
• Right temporoparietal junction (TPJ) gray matter volume correlated with both numerical and continuous quantity processing, while number proficiency was linked to right parietal regions specific to numerical processing.

Conclusions:

• The human brain possesses distinct mechanisms for quantifying numerical and continuous magnitudes.
• Selective numerical processing impairments and number-specific brain areas suggest a degree of independence from general magnitude processing resources.