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Related Experiment Videos

Posterior alpha activity is not phase-reset by visual stimuli.

Ali Mazaheri1, Ole Jensen

  • 1F. C. Donders Centre for Cognitive Neuroimaging, P.O. Box 9101, NL-6500 HB Nijmegen, The Netherlands.

Proceedings of the National Academy of Sciences of the United States of America
|February 14, 2006
PubMed
Summary

Visually evoked brain responses are not caused by phase-resetting of ongoing alpha oscillations. Magnetoencephalography data suggest separate neural events generate ongoing brain rhythms and stimulus-evoked activity.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Brain Activity

Background:

  • Ongoing debate exists regarding the generation of event-related potentials/fields (ERPs/ERFs).
  • Specifically, whether they arise from phase-resetting of ongoing neural oscillations or distinct stimulus-locked activity.
  • Electroencephalography (EEG) and magnetoencephalography (MEG) are key techniques in this research area.

Purpose of the Study:

  • To investigate the role of ongoing alpha oscillations (8-13 Hz) in visually evoked responses.
  • To determine if phase-resetting of alpha activity explains brain responses to visual stimuli.
  • To differentiate the neural mechanisms underlying ongoing oscillations versus evoked responses.

Main Methods:

  • Magnetoencephalography (MEG) was employed to measure brain activity.

Related Experiment Videos

  • Visual stimuli were presented to participants.
  • A novel 'phase-preservation index' was utilized to analyze the phase of alpha oscillations before and after stimulus presentation.

    • Main Results:

    • Single-trial analysis revealed that alpha oscillations maintain their phase relationship after visual stimuli.
    • This phase preservation contradicts the hypothesis of phase-resetting as the primary mechanism for evoked responses.
    • Event-related fields are better explained by stimulus-locked activity absent before the stimulus.

    Conclusions:

    • Visually evoked responses are unlikely to be generated by the phase-resetting of ongoing alpha oscillations.
    • Distinct neuronal events likely underlie ongoing oscillatory activity and stimulus-evoked brain responses.
    • This finding clarifies the neural basis of brain responses to sensory input.