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Related Experiment Videos

EEG event-related potentials and signal detection

R T Wilkinson, D M Seales

    Biological Psychology
    |September 1, 1978
    PubMed
    Summary

    This study investigated event-related potentials during vigilance tasks, finding that P300 amplitude changes with signal detection performance and time on task. Findings challenge previous psychological correlates of P300, suggesting influences from task duration and response criteria.

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    Area of Science:

    • Cognitive Neuroscience
    • Psychophysiology
    • Human Factors

    Background:

    • Event-related potentials (ERPs) like P300 and Contingent Negative Variation (CNV) are used to study cognitive processes.
    • Previous research linked ERPs to signal detection performance in psychophysical settings.
    • The psychological correlates of P300 require further investigation in different task paradigms.

    Purpose of the Study:

    • To determine if ERP-signal detection relationships observed in psychophysical settings generalize to vigilance tasks.
    • To investigate the influence of time on task and response criteria on ERPs.
    • To challenge and refine existing psychological correlates of P300.

    Main Methods:

    • Recorded electroencephalography (EEG) from 15 subjects during a 40-minute signal detection vigilance task.
    • Measured CNV between a warning stimulus and a signal onset.
    • Measured P300 amplitude at 300 ms post-stimulus offset and analyzed signal detection metrics (e.g., Hits, false alarms, beta).

    Main Results:

    • P300 amplitude positively correlated with signal intensity and response confidence, and was larger for correct detections.
    • Both CNV and P300 amplitudes decreased over time, paralleling a rise in response criterion (beta).
    • A negative relationship between beta and P300 amplitude was observed, contrasting with a positive relationship when confidence ratings were used.

    Conclusions:

    • Findings suggest that P300 amplitude is influenced by both signal characteristics and task-related factors like time on task and response criterion.
    • CNV reflects an individual's capacity to maintain performance during sustained attention.
    • Results support a two-factor model explaining P300 variations through prior state (time on task) and reactive/real changes.

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