Immunological and physiological changes associated with induced positive and negative mood

Area of Science:

• Psychoneuroimmunology
• Immunology
• Affective Science

Background:

• Mood states can influence physiological processes.
• Understanding the impact of emotions on the immune system is crucial for health.
• Previous research suggests a link between psychological states and immune responses.

Purpose of the Study:

• To investigate the effects of induced positive, negative, and neutral mood states on immunological parameters.
• To determine if mood valence and arousal level differentially affect immune function.
• To identify specific immune variables sensitive to mood induction.

Main Methods:

• 14 male actors participated in the study.
• Mood states (positive, negative, neutral) were induced on separate days.
• Functional and phenotypic immunological parameters were measured before, during, and after mood induction.

Main Results:

• All induced mood states, regardless of valence or arousal, altered several immune parameters, including natural killer cell activity and suppressor/cytotoxic T cell percentages.
• The proliferative response to phytohemagglutinin was uniquely affected by mood valence, increasing with positive moods and decreasing with negative moods.
• Heart rate, physical activity, and cortisol levels were identified as factors influencing mood effects on most immune parameters.

Conclusions:

• Mood states significantly impact immune function, affecting key cellular components.
• The immune system's response to mitogens like phytohemagglutinin is sensitive to the valence of induced moods.
• Physiological factors play a role in mediating the relationship between mood and immune system changes.