Changes in absolute theta power in bipolar patients during a saccadic attention task

Area of Science:

• Neuroscience
• Cognitive Psychology
• Psychiatry

Background:

• Bipolar disorder (BD) is characterized by mood fluctuations.
• Attention deficits are common in BD, impacting daily functioning.
• Theta power in electroencephalography (EEG) is associated with attention processes.

Purpose of the Study:

• To investigate absolute theta power (ATP) differences in brain areas related to attention across three BD states: depression, mania, and euthymia.
• To determine if ATP levels correlate with attention deficits in BD patients during a specific task.

Main Methods:

• Quantitative electroencephalography (EEG) was used to record brain activity in 30 BD patients.
• Patients performed a saccadic attention task while EEG data was collected from frontal and central brain regions.
• Absolute theta power (ATP) was analyzed in relation to group (BD state) and task performance.

Main Results:

• A significant main effect of group was observed across several frontal and central electrodes (C3, C4, Cz, F7, F4, F8).
• A significant main effect of moment (task phase) was found over Cz, F7, and F8 electrodes.
• These findings indicate that both the patient group (BD state) and the task influence theta activity in attention-related cortical areas.

Conclusions:

• Theta activity in specific cortical areas is modulated by both the state of bipolar disorder and the demands of an attention task.
• While theta's role in attention is established, further research is needed to elucidate its precise function in visual processing tasks requiring attention in BD.