Electrical studies of functional development of the eye and optic lobes in the chick embryo

✍ Scribed by Peters, Joseph J. ;Vonderahe, Alphonse R. ;Powers, Thomas H.

• Publisher: John Wiley and Sons
• Year: 1958
• Tongue: English
• Weight: 499 KB
• Volume: 139
• Category: Article
• ISSN: 0022-104X
• DOI: 10.1002/jez.1401390305

✦ Synopsis

THREE FIQURES

INT!RODUCTION

Periodic examinations of embryos for electrical changes dependent on the physiological condition of receptors, nerves and effectors can provide data in regard to the time and manner of onset of function (Crain, '52 ; Castillo and Vizoso, '53 ; Peters, Vonderahe and Powers, '56). The present investigation deals with the application of an electrical technique to chick embryos to ascertain when the optic apparatus shows discriminating receptiveness to photic stimulation at various frequencies. I n this technique simultaneous recordings from both optic lobes and the eye provide additional data for correlation with and interpretation of previous anatomical studies by other investigators (Kappers, Huber and Crosby, '36 ; Rudnick and Waelsch, ' 5 5 ; Wald and Zussman, '38). The design of the experiment is based on the fact that variations in light intensity and frequency evoke corresponding electrical changes in the eye, optic nerve and optic lobes of adult vertebrates (Adrian and Matthews, '34; Granit, '55 ; Hartline, '38).