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Related Experiment Videos

Steady-state visual evoked potentials and travelling waves.

G R Burkitt1, R B Silberstein, P J Cadusch

  • 1Brain Sciences Institute, Swinburne University of Technology, Hawthorn, Melbourne, Australia. burkitg@rockvax.rockefeller.edu

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|February 19, 2000
PubMed
Summary

Visual evoked potentials show travelling or standing waves based on stimulus type. Checkerboard stimuli generated travelling waves, while flicker stimuli produced standing waves, revealing insights into visual processing.

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Area of Science:

  • Neuroscience
  • Visual Neuroscience
  • Cognitive Neuroscience

Background:

  • The steady-state visual evoked potential (SSVEP) amplitude and phase are influenced by cognition and attention.
  • The precise neural mechanisms underlying these SSVEP modulations remain unclear.
  • Investigating SSVEP phase topography may elucidate these mechanisms, particularly the role of wave phenomena.

Purpose of the Study:

  • To examine stimulus-evoked changes in SSVEP phase topography.
  • To explore the potential involvement of travelling waves in SSVEP generation.
  • To differentiate between travelling and standing wave patterns in response to visual stimuli.

Main Methods:

  • Recorded EEG from 18 subjects using 10 midline scalp sites.
  • Presented central-field checkerboard and full-field flicker stimuli modulated at alpha rhythm frequency.

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  • Derived bipolar SSVEPs from adjacent electrode differences.

    • Main Results:

    • SSVEP phase patterns exhibited either travelling waves (progressive variations) or standing waves (phase reversal).
    • Checkerboard stimuli predominantly elicited travelling waves (14/18 subjects) with phase velocities of 7-11 m/s.
    • Flicker stimuli primarily resulted in standing waves (9/18 subjects), with 6 subjects showing stimulus-specific wave patterns.

    Conclusions:

    • Different spatial configurations of visual input can lead to the emergence of travelling and standing waves.
    • Wave phenomena, specifically travelling and standing waves, contribute to the spatiotemporal dynamics of the SSVEP.
    • These findings offer insights into the neural basis of attention and cognition as reflected in SSVEPs.