Impaired Sequential Working Memory in Patients With Young Onset Parkinson's Disease

Area of Science:

• Neuroscience
• Cognitive Psychology
• Movement Disorders

Background:

• Sequential working memory involves maintaining and manipulating ordered information.
• Cognitive deficits in young onset Parkinson's disease (YOPD) are not fully understood.
• This study investigates sequential working memory in YOPD patients.

Purpose of the Study:

• To evaluate sequential working memory performance in YOPD patients.
• To compare YOPD subtypes (PD-ART and PD-NART) with healthy controls.
• To explore the relationship between medication and cognitive function in YOPD.

Main Methods:

• Sixty-three YOPD patients and 100 controls underwent sequential working memory tests.
• Tests included digit span forward (DST-F), digit span backward (DST-B), and adaptive digit ordering (DOT-A).
• YOPD patients were classified into akinetic rigid (PD-ART) and non-akinetic rigid (PD-NART) types.

Main Results:

• PD-ART patients showed lower DOT-A scores and higher ordering costs than controls.
• In PD-ART, higher dopamine D2/3 receptor agonist doses correlated with better DOT-A scores.
• Higher agonist doses also correlated with lower DOT-A ordering costs in PD-ART patients.

Conclusions:

• Impaired sequential working memory may identify early cognitive issues in YOPD, especially PD-ART.
• Dopamine D2/3 receptor agonists show potential in mitigating these sequential working memory deficits.
• Sequential working memory deficits could be a marker for early cognitive impairment in YOPD.