Individual differences in true and false memory retrieval are related to white matter brain microstructure

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neuroimaging

Background:

• False memories, or remembering events that did not occur, are common and have implications beyond legal settings.
• The neural basis of individual differences in false memory formation remains incompletely understood.
• Anatomical variations in memory-related brain regions may contribute to susceptibility to false memories.

Purpose of the Study:

• To investigate the relationship between white matter microstructure and individual differences in true and false memory retrieval.
• To identify specific white matter tracts associated with accurate memory recall versus proneness to false memories.

Main Methods:

• A large cohort of participants completed a memory task (Deese-Roediger-McDermott paradigm) assessing recall and recognition.
• Diffusion tensor imaging (DTI) was used to quantify white matter microstructural properties.
• Voxel-based whole-brain regression analysis correlated fractional anisotropy (FA) with memory performance indices.

Main Results:

• True memory recall was associated with diffusion anisotropy in the inferior longitudinal fascicle, a key pathway for the medial temporal lobe.
• Increased susceptibility to false memories correlated with diffusion anisotropy in the superior longitudinal fascicle, connecting frontoparietal areas.
• Significant correlations were found between white matter microstructural properties and both true and false memory performance.

Conclusions:

• Individual differences in white matter microstructure significantly underlie performance in both true and false memory retrieval.
• Specific white matter tracts are differentially associated with accurate memory formation and the generation of false memories.
• Neuroanatomical variations provide a basis for understanding individual variability in memory accuracy and susceptibility to misinformation.