Mindfulness meditation alters neural oscillations independently of arousal.

Mindfulness meditation produces a state of relaxed alertness marked by specific changes in brain waves, but these changes are not linked to physiological arousal. In 52 healthy young adults, traditional alpha brain wave amplitude (8–13 Hz) decreased during meditation compared to rest, while a complex delta-theta-alpha component identified through a data-driven method increased. Low alpha (~9.5 Hz) and low alpha-beta (~11 Hz) components decreased. No significant differences appeared in delta, theta, beta, gamma, or high alpha waves, nor in skin conductance level (a measure of arousal). The findings indicate that meditation-related neural changes are associated with attention and awareness rather than changes in arousal.

Study at a glance

Abstract

Neuroscience has identified that mindfulness meditation induces a state of relaxed alertness, characterised by changes in theta and alpha oscillations and reduced sympathetic arousal, although the underlying mechanisms remain unclear. This study aims to address this gap by examining changes in neural oscillations and arousal during mindfulness meditation using both traditional and data-driven methods. Fifty-two healthy young adults underwent electroencephalography (EEG) and skin conductance level (SCL) recordings during resting baseline and mindfulness meditation conditions, both conducted with eyes closed. The EEG data revealed a significant decrease in traditional alpha (8-13 Hz) amplitude during mindfulness meditation compared to rest. However, no significant differences were observed between conditions in traditional delta, theta, beta, or gamma amplitudes. Frequency Principal Components Analysis (fPCA) was employed as a data-driven approach, identifying six components consistent across conditions. A complex delta-theta-alpha component significantly increased during mindfulness meditation. In contrast, low alpha (~9.5 Hz) and low alpha-beta (~11 Hz) components decreased significantly during mindfulness meditation. No significant differences were observed between conditions in the delta, high alpha, and high alpha-beta components. Additionally, there were no significant differences in SCL between conditions, nor were there correlations between traditional alpha or fPCA components and SCL. These findings support the conceptualisation of mindfulness meditation as a state of relaxed alertness, characterised by changes in neural oscillations likely associated with attention and awareness. However, the observed changes do not appear to be driven by arousal.