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Related Experiment Videos

Pattern electroretinogram and optic nerve section in pigeons.

P Blondeau, J Lamarche, G Lafond

    Current Eye Research
    |June 1, 1987
    PubMed
    Summary
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    Optic nerve section in pigeons caused a temporary drop in pattern electroretinogram (PERG) amplitude. Despite nerve fiber loss, PERG recovery suggests it is not generated by ganglion cells in pigeons.

    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Vision Science

    Background:

    • The pattern electroretinogram (PERG) is a neurophysiological test used to assess retinal function.
    • The cellular generators of the PERG in avian species remain incompletely understood.

    Purpose of the Study:

    • To investigate the impact of optic nerve section on PERG and flash electroretinogram (ERG) in pigeons.
    • To determine the origin of the PERG signal in pigeons.

    Main Methods:

    • Optic nerve section was performed on 10 pigeons.
    • PERG and flash ERG were recorded at baseline and at various intervals up to 24 weeks post-surgery.
    • Light and electron microscopy were used to examine retinal and optic nerve tissues.

    Main Results:

    Related Experiment Videos

    • PERG amplitude significantly decreased immediately after optic nerve section, gradually recovering over 24 weeks.
    • Time to peak for PERG was significantly reduced at specific time points for different spatial frequencies.
    • Flash ERG amplitude remained unchanged, but time to peak varied with stimulus intensity and time post-surgery.
    • Histological analysis revealed substantial optic nerve fiber loss and reduced retinal ganglion cells.

    Conclusions:

    • The PERG signal in pigeons does not appear to be generated by retinal ganglion cells.
    • The recovery of PERG suggests alternative neural pathways or cellular contributions in the avian retina following optic nerve injury.