Cognitive changes in spinocerebellar ataxia type 2

Area of Science:

• Neuroscience
• Genetics
• Neurology

Background:

• Spinocerebellar ataxia type 2 (SCA2) affects 19-42% of patients with cognitive disorders and dementia.
• Neuropsychological testing reveals executive dysfunction, memory impairment, and speech difficulties in SCA2 patients.

Purpose of the Study:

• To evaluate cognitive performance in patients with spinocerebellar ataxia type 2 (SCA2).
• To compare cognitive abilities between SCA2 patients and healthy controls.
• To investigate the relationship between cognitive impairment and disease characteristics in SCA2.

Main Methods:

• Psychiatric and neuropsychological examinations were conducted on 12 SCA2 patients and 12 healthy volunteers.
• Motor impairment was assessed using the brief ataxia rating scale (BARS).
• Cognitive testing included executive functions, memory, attention, and psychomotor skills, with tasks categorized by motor difficulty. The cognitive abilities composite score (CACS) was calculated.

Main Results:

• SCA2 patients demonstrated significantly lower CACS compared to healthy volunteers (p=0.00005).
• Impaired performance was observed in both simple and difficult motor tasks.
• Cognitive impairment severity correlated with age at disease onset (p=0.002) but not disease duration or BARS score.

Conclusions:

• SCA2 patients exhibit widespread cognitive deficits compared to controls.
• Cognitive performance declines with increasing motor task difficulty.
• Earlier disease onset is associated with more severe cognitive impairment in SCA2.