1. About two hundred White Leghorn female chickens were used to study the ERG, especially oscillatory potentials superimposed on the b-wave.
2. In this study, the stimulus was Xenon flash light of 20 Joule and time constant was 0.003msec. Normally, oscillatory potentials consist of three to six wavelets in ERG of adult chicken.
3. The oscillatory potentials of chick embryo first appeared on the 19th day of incubation.
4. The oscillatory potentials became obscure as the dark adaptation level increased, while they became prominent as the light adaptation level increased.
5. The b-wave of adult chicken ERG could be separated into cone responses (bp, photopic b-wave) and rod responses (bs, scotopic b-wave) by the simple procedure.
