Cerebral white matter lesions and cognitive function: the Rotterdam Scan Study

Area of Science:

• Neurology
• Neuroimaging
• Cognitive Science

Background:

• Cerebral white matter lesions (WMLs) are linked to cognitive dysfunction.
• The distinct effects of periventricular versus subcortical WMLs on cognition remain unclear.
• The association of WMLs with specific cognitive domains like memory and psychomotor speed requires further investigation.

Purpose of the Study:

• To investigate the differential relationships between periventricular and subcortical WMLs and cognitive functioning in the elderly.
• To determine if WMLs affect specific cognitive domains, such as memory and psychomotor speed.

Main Methods:

• A population-based sample of 1,077 elderly subjects was analyzed.
• White matter lesions (WMLs) were quantified using magnetic resonance imaging (MRI) and an extensive rating scale.
• Cognitive function was assessed using neuropsychological tests, creating compound scores for psychomotor speed, memory, and global cognition.

Main Results:

• Both periventricular and subcortical WMLs were individually associated with all cognitive measures.
• Periventricular WMLs remained significantly associated with global cognitive function even after accounting for subcortical WMLs.
• Subcortical WMLs lost their significant association with global cognitive function when periventricular WMLs were considered.
• Severe periventricular WMLs were linked to significantly lower performance in psychomotor speed and global cognitive function.

Conclusions:

• Periventricular white matter lesions (WMLs) have a more robust association with global cognitive function compared to subcortical WMLs.
• Cognitive processes involving speed appear more vulnerable to the effects of WMLs than memory functions.
• These findings highlight the importance of lesion location in understanding the impact of WMLs on cognitive health in aging.