ORIGIN OF SO-CALLED CONE ACTION POTENTIAL

Abstract

In the carp''s retina 2 kinds of slow potentials could be distinguished, which were recorded with a KCL-filled microelectrode after a negative change of resting potential as large as 30 mv. One showed a remarkable dependence on the area of illumination and could be more frequently recorded with a micro-electrode as large as 3[mu] in tip diameter. It was determined histologically with a silver deposit method that this potential originates in the outer plexiform layer or in the inner nuclear layer. The other, less dependent on stimulus area, could be obtained less frequently and only with a superfine microelectrode less than 0.2 [mu] in tip. It may be of cone origin.