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Activation levels, EEG, and behavioural responses.

E Schwarz-Ottersbach, L Goldberg

    International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
    |May 1, 1986
    PubMed
    Summary
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    Electroencephalogram (EEG) patterns before stimuli predict behavioral responses in alcoholic patients undergoing withdrawal. Low EEG changes indicate adequate responses, while high variability suggests subvigilant states or attention to irrelevant stimuli.

    Area of Science:

    • Neuroscience
    • Psychopharmacology
    • Cognitive Psychology

    Background:

    • Alcohol withdrawal syndrome can impair cognitive functions, including vigilance and attention.
    • Understanding the neurophysiological basis of impaired performance is crucial for effective treatment.
    • Activation theory provides a framework for examining the relationship between arousal and performance.

    Purpose of the Study:

    • To investigate the electroencephalogram (EEG) correlates of adequate versus inadequate behavioral responses in alcoholic patients.
    • To determine if prestimulus EEG patterns can predict specific behavioral outcomes (hit, miss, false response, correct rejection).
    • To explore the influence of medication (phenobarbital, diazepam) and task complexity on EEG and performance.

    Main Methods:

    Related Experiment Videos

  • Fifteen male alcoholic patients were divided into three groups: placebo, phenobarbital, and diazepam treatment for 3 weeks.
  • EEG recordings, pulse rate, drug plasma levels, mood, and performance were assessed weekly under varying activation states.
  • Prestimulus EEG patterns were analyzed in relation to behavioral responses during a vigilance task.

    • Main Results:

    • EEG patterns were significantly influenced by both medication type and task complexity.
    • Low EEG changes preceding stimulus onset were associated with adequate behavioral responses across all groups.
    • High EEG variability indicated a subvigilant state, leading to inadequate responses, potentially due to internal stimuli.
    • Missed responses during stress phases may result from selective attention to non-relevant stimuli.

    Conclusions:

    • Prestimulus and during-stimulus EEG activity critically determines behavioral response type in alcoholic patients during acute withdrawal.
    • Differential high variability in EEG is specific to the response type, while power values depend on medication and task demands.
    • These findings highlight the role of EEG in understanding cognitive deficits and response patterns in alcohol withdrawal.