The right anterior temporal lobe critically contributes to magnitude knowledge

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neurology

Background:

• Cognitive estimation, crucial for numerical problem-solving with incomplete data, is linked to executive functions and semantic memory.
• Neural underpinnings of cognitive estimation remain largely unexplored.
• Patients with right-hemisphere stroke and left hemineglect often exhibit cognitive estimation deficits.

Purpose of the Study:

• To investigate the neural correlates of cognitive estimation impairment.
• To examine the role of semantic memory in numerical magnitude estimation.
• To identify specific brain regions associated with cognitive estimation deficits.

Main Methods:

• Cross-sectional study utilizing lesion-symptom mapping.
• Comparison of 55 patients with right-hemisphere stroke-induced left hemineglect against 55 age- and gender-matched healthy controls.
• Assessment of cognitive estimation abilities in both groups.

Main Results:

• Patients with right-hemisphere stroke showed impaired cognitive estimation compared to controls.
• No significant bias towards large magnitudes was observed in the patient group.
• Lesion-symptom mapping identified the right anterior temporal lobe as predominantly associated with estimation impairment.
• The right uncinate fasciculus, anterior commissure, and right inferior frontal gyrus were also critically involved.

Conclusions:

• The right anterior temporal lobe plays a critical role in cognitive estimation, particularly in processing real-world numerical magnitudes.
• Findings support the role of semantic memory in cognitive estimation.
• This research contributes to understanding the neural basis of numerical cognition and semantic processing hubs.