Subjective and physiological emotional response in euthymic bipolar patients: a pilot study

Area of Science:

• Psychiatry
• Neuroscience
• Psychology

Background:

• Bipolar disorder (BD) is characterized by mood episodes, but residual symptoms may persist during euthymic phases.
• Subsyndromal emotional disturbances are hypothesized to be present in euthymic bipolar patients.
• Understanding emotional processing in euthymia is crucial for comprehensive BD management.

Purpose of the Study:

• To compare subjective and physiological emotional responses between euthymic bipolar patients and healthy controls.
• To investigate emotional processing differences using standardized emotional stimuli.
• To explore potential residual emotional symptoms in the euthymic phase of bipolar disorder.

Main Methods:

• Utilized the International Affective Picture System (IAPS) for emotional induction.
• Assessed subjective emotional response using the Self-Assessment Manikin (SAM).
• Measured physiological emotional response via pupillometry (pupil dilation).

Main Results:

• No significant differences were observed in subjective emotional responses between groups.
• Euthymic bipolar patients exhibited significantly lower pupil dilation in response to positive pictures compared to controls.
• This physiological difference suggests altered emotional reactivity to positive valence in euthymia.

Conclusions:

• Euthymic bipolar disorder is associated with a blunted physiological response to positive emotional stimuli.
• This finding supports the concept of residual emotional symptoms or a negative emotional bias in euthymia.
• Pupillometry may serve as a sensitive indicator of emotional processing deficits in bipolar disorder.