Microstructural organization of superior longitudinal fasciculus and cingulum bundle support metacognition driven...

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neuroimaging

Background:

• Metacognition plays a key role in cognitive offloading, the use of external tools to reduce cognitive load.
• The specific white matter pathways supporting metacognition in cognitive offloading are not well understood.

Purpose of the Study:

• To investigate the neural basis of white matter tracts that support metacognition-driven cognitive offloading.
• To examine the relationship between white matter microstructural integrity and the strategic use of external memory aids.

Main Methods:

• Diffusion tensor imaging (DTI) was used to measure white matter microstructural integrity (fractional anisotropy - FA) in 34 participants.
• Behavioral data on memory confidence and external reminder usage were collected.
• Analysis focused on the association between FA values in specific white matter tracts and cognitive offloading behavior.

Main Results:

• Under-confidence in internal memory was associated with increased use of external reminders, replicating prior findings.
• Microstructural integrity of the superior longitudinal fasciculus (SLF) and cingulum bundle (CB) predicted optimal use of reminders.
• Forix integrity negatively predicted confidence in internal memory performance.

Conclusions:

• White matter microstructural organization within the fronto-temporal-parietal network is related to metacognition-driven cognitive offloading.
• Specific tracts, including the SLF and CB, are crucial for regulating the use of external memory aids based on metacognitive judgments.