Information Processing in the Frog's Retina

Item

Title
Information Processing in the Frog's Retina
Date
1965
Index Abstract
Not Available
Photo Quality
Complete
Report Number
AMRL TR 65-24
Creator
Lipetz, Leo E.
Corporate Author
Ohio State University Research Foundation
Laboratory
Biophysics Laboratory
Extent
84
Identifier
AD0614249
Access Rights
CFSTI
Distribution Classification
1
Contract
AF 33(657)-7578
DoD Project
None Given
DoD Task
None Given
DTIC Record Exists
No
Distribution Change Authority Correspondence
None
Distribution Conflict
No
Abstract
The information handling properties of the frog's retina were studied by three techniques. (a) An attempt was made to investigate the mutual interaction of excitatory and inhibitory connections to bipolar cells by studying the averaged electroretinogram response to stimulation with various patterns of light. It was found that present techniques of electroretinography and photometry did not permit the required stability of measurement. (b) Light and electron microscope studies were made of the cell types and connections of the frog's retina. Illustrative micrographs are included in the report. The new findings were made that the Landolt club of the small bipolar cell is a mitochondria-packed process and that it terminates as a cilium in the aqueous space between the visual cells. It is suggested that the function of these structures is to detect the presence of bleached, unregenerated visual pigment molecules in the surrounding visual cells. (c) A technique was developed which seems to result in selective staining of the active bipolar-ganglion cell synapses. With it functional and anatomical studies were correlated to identify the four ganglion cell anatomic types which transmit information each as to the presence in its receptive field of (1) an edge, (2) a small dark image, (3) a changing light distribution, and (4) a dimming of light intensity.
Report Availability
Full text available
Date Issued
1965-02
Provenance
RAF Centre of Aviation Medicine
Type
report
Format
1 online resource
Media
AMRLTR65-024.pdf