Is it logical to count on quantifiers? Dissociable neural networks underlying numerical and logical quantifiers

Area of Science:

• Neuroscience
• Cognitive Psychology
• Linguistics

Background:

• Quantifiers are crucial linguistic elements conveying quantity or logic.
• Understanding quantifiers involves distinct cognitive processes, potentially relying on different neural substrates.
• Previous research has not fully delineated the neural basis for different classes of quantifiers.

Purpose of the Study:

• To investigate the neural underpinnings of numerical quantifiers (e.g., 'at least three') versus logical quantifiers (e.g., 'some').
• To differentiate the brain networks involved in magnitude processing for numerical quantifiers and perceptual logic for logical quantifiers.

Main Methods:

• Functional neuroimaging (fMRI) in healthy adults.
• Behavioral and structural neuroimaging data from patients with corticobasal degeneration (CBD) and acalculia.
• Converging evidence from both healthy and patient populations to identify distinct neural substrates.

Main Results:

• Numerical quantifier comprehension is associated with a lateral parietal-dorsolateral prefrontal network.
• Logical quantifier comprehension is linked to a rostral medial prefrontal-posterior cingulate network.
• Patients with acalculia due to CBD showed deficits consistent with the proposed neural dissociations.

Conclusions:

• Abstract number knowledge significantly contributes to the semantic memory of numerical quantifiers.
• Logical quantifiers may rely on a distinct logic-based evaluation system.
• The findings highlight a neural dissociation in the comprehension of different quantifier types.