Autonomic nervous system arousal and cognitive functioning in bipolar disorder

Area of Science:

• Neuroscience
• Psychiatry
• Psychophysiology

Background:

• Previous research on cognitive dysfunction in bipolar disorder (BD) primarily focused on trait factors like neurological impairment.
• State factors, beyond mood symptoms, that could worsen functional deficits in BD remain underexplored.

Purpose of the Study:

• To investigate autonomic nervous system (ANS) arousal in euthymic patients with BD during cognitive challenges.
• To compare physiological arousal and neuropsychological performance between patients with BD and healthy controls (HC).

Main Methods:

• Thirty euthymic patients with BD and 22 HC underwent physiological monitoring (electrogram, skin temperature, galvanic skin response).
• Participants completed baseline mood, anxiety, and substance use assessments.
• Cognitive function was assessed using a computerized neuropsychological battery (CNS Vital Signs) after a resting baseline period.

Main Results:

• Patients with BD exhibited significantly higher mood symptoms and trait-anxiety than HC.
• The BD group showed elevated physiological arousal at baseline and during cognitive testing, with a greater increase from rest to testing compared to HC.
• HC outperformed patients with BD across multiple cognitive domains, including memory, attention, processing speed, and working memory.

Conclusions:

• Patients with BD experience greater autonomic nervous system (ANS) arousal fluctuations between rest and cognitive tasks compared to HC.
• These heightened arousal responses correlate with poorer cognitive performance in individuals with BD.
• Further research is warranted to explore the direct impact of anxiety symptoms on cognitive functioning in BD.