Thalamic Shape and Cognitive Performance in Amnestic Mild Cognitive Impairment

Area of Science:

• Neuroimaging
• Cognitive Neuroscience
• Neurology

Background:

• Mild cognitive impairment (MCI) is a transitional stage between normal aging and dementia.
• Amnestic MCI (aMCI) specifically affects memory, often preceding Alzheimer's disease.
• The thalamus plays a crucial role in memory processing and is implicated in cognitive decline.

Purpose of the Study:

• To investigate thalamic shape alterations in individuals with aMCI.
• To examine the relationship between these thalamic changes and episodic memory impairments.

Main Methods:

• Compared thalamic volumes and morphology between aMCI patients and healthy controls using neuroimaging.
• Assessed memory functions using a comprehensive neuropsychological battery.
• Correlated thalamic shape deformations with memory performance in aMCI subjects.

Main Results:

• aMCI patients had significantly smaller left thalamic volumes than controls.
• Significant thalamic shape deformations were observed in the left dorso-medial and antero-medial regions of aMCI subjects.
• Left thalamic dorso-medial deformations correlated significantly with poorer Word List Memory and delayed verbal recall scores.

Conclusions:

• Thalamic shape alterations in specific left-sided regions are associated with memory deficits in aMCI.
• These structural changes may represent underlying neurobiological mechanisms of thalamic dysfunction in aMCI.
• Targeting these thalamic regions could be relevant for understanding and potentially treating memory impairments in aMCI.