The efficiency of the serial multiple visual discrimination apparatus and method with white rats.

1953 ◽  
Vol 46 (1) ◽  
pp. 69-76 ◽  
Author(s):  
Paul E. Fields
Keyword(s):  
Visual Discrimination ◽  
White Rats ◽  
Discrimination Apparatus

scholarly journals Behavioral evaluation of visual function of rats using a visual discrimination apparatus

2007 ◽  
Vol 162 (1-2) ◽  
pp. 84-90 ◽  
Author(s):  
Biju B. Thomas ◽  
Deedar M. Samant ◽  
Magdalene J. Seiler ◽  
Robert B. Aramant ◽  
Sharzad Sheikholeslami ◽  
...  
Keyword(s):  
Visual Function ◽  
Visual Discrimination ◽  
Discrimination Apparatus

Visual Discrimination Learning in Rats with Lesions of Superior Colliculus: Door-Push and Approach Errors in Modified Jumping Stand

1981 ◽  
Vol 33 (3b) ◽  
pp. 141-157 ◽  
Author(s):  
Paul Dean ◽  
Sian G. Pope
Keyword(s):  
Eye Movements ◽  
Superior Colliculus ◽  
Open Field ◽  
Discrimination Learning ◽  
Visual Discrimination ◽  
Visual Discrimination Learning ◽  
Central Platform ◽  
Area Centralis ◽  
Scanning Head ◽  
Discrimination Apparatus

It has been suggested that, for some species, lesions of the superior colliculus affect visual discrimination learning, but only in certain conditions: (a) when problems are first learnt only after operation, or (b) when discriminanda require detailed scanning, or (c) when “approach” responses to the discriminanda are measured, rather than the response of actually touching them. These suggestions were examined in rats learning visual discriminations in a modified jumping-stand apparatus, after sustaining large lesions of the superior colliculus (and in some cases also of the pretectum). The lesions produced open-field hyperactivity and reduced exploration, indicating effective tectal damage, but the rats learnt a series of difficult discriminations in a door-push task as fast as normal rats, and they did not make more approach errors. Their main abnormality in the discrimination apparatus was that they looked less often between the stimulus doors before stepping across to one of them from the central platform. It is suggested that in rats, as in other animals, lesions of the superior colliculus disrupt the control of scanning head and eye movements; in rats, however, such disruption need not affect discrimination learning (at least in some kinds of apparatus), possibly because the retina of the rat has a relatively poorly developed area centralis.

Visual discrimination of movement by white rats.

1933 ◽  
Vol 16 (1) ◽  
pp. 137-142 ◽  
Author(s):  
J. M. Hawley ◽  
N. L. Munn
Keyword(s):  
Visual Discrimination ◽  
White Rats

X-Ray Microanalysis of Nickel and Cobalt Intensified Peroxidase- Antiperoxidase For Verification of Reaction Sites

1985 ◽  
Vol 43 ◽  
pp. 468-469
Author(s):  
A. Angel ◽  
K. Miller ◽  
V. Seybold ◽  
R. Kriebel
Keyword(s):  
Reaction Mechanisms ◽  
Visual Discrimination ◽  
Osmium Tetroxide ◽  
Ultrastructural Level ◽  
Microscopic Level ◽  
Electron Microscopic Level ◽  
Electron Microscopic ◽  
X Ray ◽  
Insoluble Polymer ◽  
Cytochemical Reaction

Localization of specific substances at the ultrastructural level is dependent on the introduction of chemicals which will complex and impart an electron density at specific reaction sites. Peroxidase-antiperoxidase(PAP) methods have been successfully applied at the electron microscopic level. The PAP complex is localized by addition of its substrate, hydrogen peroxide and an electron donor, usually diaminobenzidine(DAB). On oxidation, DAB forms an insoluble polymer which is able to chelate with osmium tetroxide becoming electron dense. Since verification of reactivity is visual, discrimination of reaction product from osmiophillic structures may be difficult. Recently, x-ray microanalysis has been applied to examine cytochemical reaction precipitates, their distribution in tissues, and to study cytochemical reaction mechanisms. For example, immunoreactive sites labelled with gold have been ascertained by means of x-ray microanalysis.

Effects of Censure and Chlorpromazine on Visual Discrimination Behavior of Schizophrenic and Alcoholic Patients

1969 ◽  
Author(s):  
Norman Garmezy ◽  
Sheldon A. Weintraub ◽  
David M. Wright ◽  
Luis Tredici ◽  
Burtrum C. Schiele
Keyword(s):  
Visual Discrimination
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