Linking morphological and functional variability in hand movement and silent reading.

Area of Science:

• Neuroscience
• Neuroanatomy
• Cognitive Neuroscience

Background:

• The principle that brain anatomy and function are interconnected is widely accepted in neuroscience.
• Local variations in brain morphology are hypothesized to correspond with functional variations.
• Understanding this relationship is key to deciphering individual differences in cognitive processing.

Purpose of the Study:

• To investigate the link between cortical folding pattern variability and functional brain activation.
• To examine how anatomical differences in specific brain regions relate to motor and reading tasks.
• To explore the anatomical basis of functional specialization in the human brain.

Main Methods:

• Analysis of cortical folding patterns in 252 right-handed subjects using multidimensional scaling.
• Correlation of anatomical variability in the central sulcus, precentral sulcus, and superior temporal sulcus (STS) with functional activations.
• Functional activations were measured during hand motion and silent reading tasks.

Main Results:

• A strong correlation was found between the 'hand knob' morphology of the central sulcus and the location of motor hand activations.
• The size of the left hand motor activation correlated with the dorsal/ventral positioning of the central sulcus knob.
• A novel association was identified between silent reading activation location and central sulcus morphology, and STS activation size and posterior branch development.

Conclusions:

• The study confirms a direct relationship between anatomical variability and functional activation patterns in the human brain.
• Morphological traits, such as the central sulcus 'hand knob,' precisely predict the location of related functional activations.
• These findings highlight the anatomical underpinnings of functional specialization and individual differences in cognitive tasks.