How verbal and spatial manipulation networks contribute to calculation: an fMRI study

Area of Science:

• Neuroscience
• Cognitive Psychology
• Cognitive Neuroscience

Background:

• Numerical calculation depends on working memory (WM) resources.
• Understanding the specific brain networks involved in numerical WM manipulation is crucial.

Purpose of the Study:

• To investigate the distinct contributions of verbal and spatial working memory (WM) brain networks during the addition of numbers in adults.
• To identify the neural correlates of number manipulation versus maintenance.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to study adults performing addition tasks.
• Tasks involved manipulation and maintenance of syllables, locations, or two-digit numbers.

Main Results:

• Number manipulation (addition) activated a widespread network including temporal, parietal, and prefrontal regions.
• Three distinct WM manipulation systems were identified: executive, language-related, and spatial.
• The anterior intraparietal sulcus (IPS) was implicated in magnitude processing for both symbolic and nonsymbolic stimuli.

Conclusions:

• Arithmetic calculation requires the integration of executive, language-related, and spatial WM systems.
• The anterior IPS plays a key role in processing numerical magnitude, with left-hemispheric specialization for arithmetic.
• This research clarifies the neural basis of numerical cognition and working memory.