1,721,094 research outputs found
VEPs to onset of chromatic red-green and blue-yellow gratings in Parkinson’s disesase never treated with L-Dopa.
No full text
Retinal and cortical evoked responses to chromatic contrast stimuli. Specific losses in both eyes of patients with multiple sclerosis and unilateral optic neuritis
No full text
The pigeon pattern electroretinogram is not affected by massive loss of cell bodies in the ganglion layer induced by chronic section of the optic nerve.
No full textRetinal and tectal responses to alternating gratings are unaffected by monocular deprivation in pigeons.
No full text
The electroretinogram of the little owl (Athene noctua).
No full textElectroretinographic responses (ERGs) have been recorded from the cornea of the little owl (
Athene noctua) in response to single light flashes and to alternating sinusoidal gratings (pattern) at different levels of light adaptation. Both flash- and pattern-evoked ERGs show scotopic as well as photopic components. The pattern evoked ERG is spatially tuned with tuning functions which shift towards lower frequencies by reducing the mean luminance. The retinal acuity is about 6c/deg at 2.3 log cd/m
2 and decreases progressively by reducing the mean luminance. No pattern ERG can be recorded beyond −6. 7 log cd/m
2 at any spatial frequency. The pattern ERG amplitude decreases progressively by reducing the contrast. The extrapolated contrast threshold is about 1%. Acuity and contrast sensitivity ERG values are in the range of those obtained by operant techniques in other species with duplex retinae such as owls and cats
- …
