Strong health messages increase audience brain coupling.

Area of Science:

• Neuroscience
• Health Communication
• Public Health

Background:

• Mass media campaigns are crucial for public health, but their effectiveness hinges on audience engagement.
• Young adults are a key demographic for alcohol prevention initiatives, necessitating tailored communication strategies.

Purpose of the Study:

• To investigate the neural correlates of health message effectiveness using electroencephalography (EEG).
• To establish EEG-based inter-subject correlation (ISC) as a quantifiable marker for audience engagement with health messages.

Main Methods:

• Young adults' brain activity was recorded using EEG while they viewed video messages about risky alcohol use.
• Inter-subject correlation (ISC) in EEG signals was analyzed to assess neural synchrony.
• EEG-ISC findings were correlated with self-reported drinking behavior changes and validated against functional magnetic resonance imaging (fMRI) data.

Main Results:

• Highly effective health messages elicited significantly greater inter-subject correlation (ISC) in brain activity.
• EEG-ISC was linked to subsequent reductions in risky drinking behavior.
• Neural regions associated with ISC included sensory-perceptual areas, cortical midline regions, and the insula, areas implicated in message processing and engagement.

Conclusions:

• EEG-based ISC serves as a promising biomarker for quantifying audience engagement and the effectiveness of naturalistic health messages.
• This approach offers a novel method to assess the neural impact of mass communication on target audiences.