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Pseudorandom binary sequence stimulation applied to the visual evoked response. Normative data and a comparative

A D Collins1, B B Sawhney

  • 1Department of Ophthalmology, Royal Victoria Hospital, Belfast, Northern Ireland.

Documenta Ophthalmologica. Advances in Ophthalmology
|January 1, 1993
PubMed
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A novel pseudorandom binary sequence (PBS) flash stimulation method significantly enhances visual evoked response (VER) testing. This advanced technique is nearly 12 times more effective than conventional flash VER for detecting visual pathway lesions.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Conventional flash stimulation is less sensitive than pattern stimulation for detecting visual pathway lesions.
  • Patients unable to fixate require diffuse flash stimulation for visual evoked response (VER) testing.
  • A more sensitive diffuse flash stimulation method is needed.

Purpose of the Study:

  • To investigate a complex flash stimulation method using a pseudorandom binary sequence (PBS) for visual evoked response (VER) testing.
  • To compare the efficacy of PBS-VER with conventional pattern and flash VER in detecting visual pathway lesions.

Main Methods:

  • Developed a diffuse flash VER stimulus using a pseudorandom binary sequence (PBS) that switches between illumination levels.
  • Applied random signal analysis to determine the visual pathway's impulse response.

Related Experiment Videos

  • Compared PBS-VER, pattern VER, and conventional flash VER in 140 patients and 29 normal subjects.

    • Main Results:

    • The PBS-VER impulse function in normal subjects showed morphology similar to conventional flash VER, with a comparable P100 latency.
    • P100 amplitude standard deviation was significantly greater in PBS-VER compared to conventional methods.
    • PBS-VER was almost 12 times more effective than flash VER in detecting visual system lesions.

    Conclusions:

    • Pseudorandom binary sequence (PBS) flash stimulation offers a more sensitive method for eliciting visual evoked responses (VERs).
    • PBS-VER is a valuable tool for identifying lesions in the visual pathway, outperforming conventional flash VER.
    • This advanced stimulation technique improves diagnostic capabilities in neuro-ophthalmology.