P300 and Heart Rate Variability Recorded Simultaneously in Meditation

Area of Science:

• Neuroscience
• Psychophysiology

Background:

• Sympathetic nervous system activation is crucial for attention.
• Meditation practices have been shown to enhance attention and modulate sympathetic activity.

Purpose of the Study:

• To investigate the effects of different meditation states on attention and sympathetic activity.
• To assess attention using P300 event-related potentials and sympathetic activity via heart rate variability.

Main Methods:

• Forty-seven male participants underwent four mental states: random thinking, nonmeditative focusing, meditative focusing, and defocused meditation over four days.
• Heart rate variability (HRV), respiration, and P300 event-related potentials (ERPs) were recorded before and after each session.
• Data were analyzed using repeated-measures ANOVA with post hoc analysis.

Main Results:

• Meditative focusing led to increased low-frequency (LF) HRV power, decreased high-frequency (HF) HRV power, and elevated average heart rate.
• Defocused meditation resulted in decreased average heart rate.
• Both meditative focusing and defocused meditation significantly increased P300 peak amplitude, with defocused meditation also reducing peak latency.

Conclusions:

• Focused meditation appears to induce sympathetic arousal.
• Defocused meditation may enhance cognitive processing speed for attention tasks and promote parasympathetic activity.
• Different meditation techniques elicit distinct psychophysiological responses affecting attention and autonomic balance.