Electrical changes in brain and eye of developing chick during hyperthermia

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Abstract
As the body temperature of chicks between the day of hatching and the 3rd week after hatching was raised from normal to approximately 44.5 C, the eye was subjected to periodic photic stimulation while electrical recordings were taken from the eye and cerebral and optic lobes. As body temperature rose, the cerebrum showed an increased percentage of low-voltage fast waves mainly in the older birds, then sequences of slow waves of large amplitude, and finally a disappearance of spontaneous electrical activity, even though an electrocardiogram persisted for several minutes longer. During photic stimulation and hyperthermia, at the optic lobes the "flash-for-flash" response disappeared first, and then the "on" response, followed by a loss of the electroretinogram at the eye. Under the influence of hyperthermia, electrical activity of brain and eye persisted longest in the newly hatched chicks, and in them there appeared a slow spike and wave pattern probably associated with brain damage.

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