R/^BBIT 



ELECTRICAL PHENOMENA IN VISION 



CAT MONKEY MAN 



609 



130 sec 



2 10 sec 



100 cycles/sec 



320 sec 



34 sec 



35 sec 



34 sec 



50 sec 



47 sec 



50 sec 



100 cycles/sec 



-J'Mk,, ..., NO SENSATION 



--^'^W/WVSA^ 



162 sec 



109 sec 



Fig. 13-17. Elect roretiuogram and optic-tract response during asphyxia of the eye. 

 (Noell, 1951.) 



6-wave has not completely disappeared at the moment when vision has 

 been temporarily destroyed by reducing the flow of blood to the eyeball. 

 It is concluded that, with retinal asphyxia, human vision fails at the 

 moment when the ganglion cells are inactivated. The 6-wave originates 

 presumably in the sense cells or bipolars, and these elements are appar- 

 ently more resistant to asphyxia than are the ganglion cells. (4) In har- 

 mony with the above conclusion is the finding that some activity may be 

 detected in first- or second-order neurones of the rabbit after the third- 



