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Related Concept Videos

Brain Waves01:23

Brain Waves

Brain waves are electrical signals generated by the neurons in the brain, which are regularly monitored to measure mental activities. Brain waves and their frequency ranges can be measured using an electroencephalogram or EEG. There are four main types of brain waves, each with distinct characteristics:

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Alpha EEG Activity and Pupil Diameter Coupling during Inactive Wakefulness in Humans.

Rodrigo Montefusco-Siegmund1, Miriam Schwalm2, Eduardo Rosales Jubal3

  • 1Instituto de Aparato Locomotor y Rehabilitación, Human Cognitive Neurophysiology and Behaviour Laboratory, Facultad de Medicina, Universidad Austral de Chile, Valdivia, 5111815, Chile rodrigo.montefusco@uach.cl.

Eneuro
|April 2, 2022
PubMed
Summary

Brain activity measured by electroencephalography (EEG) alpha-band amplitude and pupil diameter changes are linked. This suggests that EEG and pupil diameter can monitor moment-to-moment attention variations in humans.

Keywords:
arousalcortical statesneural oscillationsresting state

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psychophysiology

Background:

  • Human behavior adapts to internal and environmental demands via nervous system changes.
  • Attention, a key cognitive process, fluctuates and is linked to neural dynamics.
  • Pupillary activity and alpha-band oscillations (EEG) are potential indicators of attentional states, but their temporal relationship is unclear.

Purpose of the Study:

  • To investigate the temporal relationship between electroencephalographic (EEG) alpha-band activity and pupillary diameter fluctuations in humans.
  • To determine if alpha-band amplitude and pupil diameter are comodulated, reflecting moment-to-moment changes in attention.

Main Methods:

  • Recorded simultaneous electroencephalography (EEG) and pupillary activity from 16 human subjects.
  • Subjects maintained fixation on a gray screen for 1 minute.
  • Analyzed the temporal covariance between alpha-band amplitude and high-frequency pupil diameter components.

Main Results:

  • A significant spontaneous covariate relationship was found between alpha-band amplitude and pupil diameter.
  • Peak alpha-band amplitude preceded peak pupil diameter by approximately 300 ms.
  • Trough pupil diameter was preceded by minimum alpha-band amplitude by approximately 350 ms.

Conclusions:

  • The findings provide evidence for the comodulation of EEG alpha activity and pupil diameter, supporting their linked role in attention.
  • This temporal coincidence suggests that moment-to-moment attentional shifts can be monitored by simultaneously measuring EEG and pupil diameter.
  • This research opens avenues for non-invasive monitoring of cognitive states through combined psychophysiological measures.