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Related Experiment Videos

A versatile programmable pattern generator.

H Sportel, H W Smit, C A Grimbergen

    Vision Research
    |January 1, 1987
    PubMed
    Summary
    This summary is machine-generated.

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    A new visual pattern generator, programmable by microcomputer, is presented for portable visual evoked potential analysis. This system calibrates video monitor signals for accurate visual stimulation and analysis.

    Area of Science:

    • Biomedical Engineering
    • Neuroscience
    • Ophthalmology

    Background:

    • Visual evoked potential (VEP) analysis is crucial for diagnosing visual pathway disorders.
    • Existing VEP systems may lack portability and flexibility in visual stimulus generation.
    • Microcomputer control offers potential for enhanced VEP system programmability.

    Purpose of the Study:

    • To describe a versatile, microcomputer-programmable visual pattern generator.
    • To integrate this generator into a portable visual evoked potential analysis system.
    • To ensure accurate visual stimulus generation for VEP analysis.

    Main Methods:

    • Developed a single-board hardware generator (3" x 10") compatible with a microcomputer (Apple II).
    • The generator produces signals for standard 50 Hz video monitors.

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  • Implemented a photocell-based calibration to correct for monitor phosphor non-linearity.

    • Main Results:

    • A functional visual pattern generator integrated into a portable VEP system was successfully developed.
    • The system effectively produces programmable visual stimuli for VEP analysis.
    • Calibration ensures accurate stimulus intensity, compensating for video monitor characteristics.

    Conclusions:

    • The described visual pattern generator enhances the portability and programmability of VEP analysis systems.
    • This hardware facilitates precise visual stimulation, crucial for reliable VEP data acquisition.
    • The system offers a cost-effective solution for advanced visual neuroscience research and clinical applications.