Spontaneous pupillary oscillations increase during mindfulness meditation

Area of Science:

• Neuroscience
• Cognitive Science
• Psychophysiology

Background:

• Pupil size fluctuates with cognitive and perceptual states.
• Spontaneous low-frequency pupil diameter oscillations, known as pupillary hippus, are influenced by neural factors like arousal and cortical excitability.

Discussion:

• This study demonstrates that mindfulness meditation modulates pupillary oscillations.
• A 53% increase in pupillary oscillations was observed during meditation compared to baseline.
• This effect was specific to trained meditators and low frequencies (<1 Hz), with delta frequencies (1-5 Hz) remaining unchanged.

Key Insights:

• Pupillary oscillations are significantly enhanced by mindfulness meditation in trained practitioners.
• The observed changes in pupillary oscillations are frequency-specific, primarily affecting frequencies below 1 Hz.
• Pupil size dynamics offer a potential non-invasive marker for assessing altered cortical states induced by meditation.

Outlook:

• Further research can explore the precise neural mechanisms underlying meditation-induced pupillary oscillation changes.
• Investigating pupillary oscillations could lead to objective measures for evaluating meditation training effectiveness.
• This work opens avenues for using pupillometry in understanding other states of consciousness and cognitive processes.