The time relationships between the component waves of the electroretinogram, evoked potentials of the optic chiasm, and visual cortex were investigated.
Selective cooling of the eye by intraocular perfusion while maintaining normothermic body and brain temperatures was performed on a series of cats.
Under these conditions, the amplitude of the ERG waves was reduced and the latencies increased, while little effect on the more central evoked potentials was noted.
When the eye temperature was reduced below 27 C, the evoked potentials of both the optic chiasm and the visual cortex clearly preceded the onset of the b-wave of the ERG.
This further supports the contention that the b-wave represents an elaborative or adaptive process within the retina and does not represent the most direct transmission of visual information from the photoreceptors to the brain stem and visual cortex.
WOLIN LR, MASSOPUST LC. Selective Cooling of the EyeEffects on Evoked Potentials of the Visual System. Arch Ophthalmol. 1966;76(5):723-728. doi:10.1001/archopht.1966.03850010725020