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Pattern-induced negative occipital potentials (PINOP).

Kurupath Radhakrishnan1, Ashakiran J Sunku, Jane F Donat

  • 1Sree Chitra Tirunal Institute for Medical Sciences and Technology, Trivandrum, Kerala, India.

Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society
|June 5, 2007
PubMed
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We identified a new EEG response to geometric patterns called pattern-induced negative occipital potentials (PINOP). This benign physiological phenomenon is not associated with epilepsy.

Area of Science:

  • Neurophysiology
  • Electroencephalography (EEG)

Background:

  • The electroencephalogram (EEG) is a key tool for studying brain activity.
  • Physiological EEG responses to visual stimuli, such as lambda waves, are well-documented.
  • A specific EEG response to geometric pattern scanning was not previously well-characterized.

Purpose of the Study:

  • To describe a novel EEG response observed during visual scanning of geometric patterns.
  • To differentiate this response from known EEG phenomena like lambda waves.
  • To assess the clinical significance of this response, particularly its association with epilepsy.

Main Methods:

  • EEG recordings were obtained from 24 subjects (3-36 years) viewing geometric patterns.
  • Characteristics of the EEG response were analyzed, including distribution, duration, and polarity.

Related Experiment Videos

  • Subjects were compared to age- and sex-matched controls without the response.
  • Photic stimulation and pattern activation tests were performed.

    • Main Results:

    • A distinct EEG response, termed pattern-induced negative occipital potentials (PINOP), was identified.
    • PINOP were occipitally distributed, surface-negative, brief, and sharp.
    • These potentials disappeared upon eye closure.
    • No significant difference in epilepsy prevalence was found between subjects with PINOP and controls.
    • No epileptiform responses were observed during photic or pattern stimulation in subjects with PINOP.

    Conclusions:

    • Pattern-induced negative occipital potentials (PINOP) represent an unusual, benign physiological phenomenon.
    • The posterior head region distribution and lack of epileptiform activity are diagnostic clues.
    • Differential activation in the occipital lobe may explain the unique waveform morphology.