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Related Experiment Videos

Alpha-contingent EEG feedback reduces SPECT rCBF variability.

Thomas McLaughlin1, Bruce Steinberg, Thomas Mulholland

  • 1Lawrence General Hospital, 1 General Street, Lawrence, MA 01841, USA.

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
|April 5, 2005
PubMed
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EEG feedback reduces variability in alpha-blocking event durations. This study investigated if this EEG feedback also reduces regional cerebral blood flow (rCBF) variability, finding it does, with implications for brain imaging.

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Brain Imaging

Background:

  • Electroencephalography (EEG) feedback links alpha wave occurrence to visual stimuli, reducing alpha-blocking duration variability.
  • A temporal link exists between electro-cortical activity and regional cerebral blood flow (rCBF).

Purpose of the Study:

  • To determine if EEG feedback, which reduces alpha-blocking duration variability, also reduces rCBF variability.
  • To explore the methodological implications of reduced rCBF variability for future brain-imaging studies.

Main Methods:

  • Seven subjects received visual stimuli contingent on alpha events (alpha-contingent stimulation, ACS) or non-alpha events (not-alpha-blocking-contingent stimulation, NACS) in a within-subjects design.
  • Regional cerebral blood flow (rCBF) was measured from cortical and sub-cortical regions.

Related Experiment Videos

  • Variability of alpha-blocking durations and rCBF responses in visual associative regions of interest (ROIs) were analyzed, alongside distributed rCBF measures.

    • Main Results:

    • Both EEG and rCBF measures showed decreased variability under ACS.
    • This variance reduction was observed in both localized and distributed rCBF measures.
    • Improved control over physiological responses was demonstrated.

    Conclusions:

    • EEG feedback, specifically ACS, effectively reduces variability in both EEG-derived alpha-blocking durations and regional cerebral blood flow (rCBF).
    • The findings suggest that EEG feedback can enhance the control and reduce the variability of physiological responses, offering potential methodological advantages for brain-imaging research.