Behavioral estimates of absolute threshold in rat
Autor: | Daniel G. Green, Pilar Herreros de Tejada, Carmen Musioz Tedo |
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Rok vydání: | 1994 |
Předmět: |
medicine.medical_specialty
Light genetic structures Albinism Physiology Absolute threshold Dark Adaptation Visual evoked potentials Motor Activity Stimulus (physiology) Internal medicine medicine Psychophysics Animals Behavior Animal Pigmentation Chemistry Behavioral methods Water Sensory Systems Rats Light intensity Electrophysiology Endocrinology Sensory Thresholds Bar pressing Visual Perception Reinforcement Psychology |
Zdroj: | Visual Neuroscience. 11:1077-1082 |
ISSN: | 1469-8714 0952-5238 |
DOI: | 10.1017/s0952523800006891 |
Popis: | Dark-adapted thresholds of albino and pigmented rats were estimated using behavioral methods. Albino and pigmented rats who had been water deprived learned to bar press for water reinforcement when a light stimulus was presented. Absolute threshold was defined to be the light intensity at which bar pressing behavior was significantly modified by the presence of the light stimulus. Albino rats had an average threshold of −5.23 log cd/m2 and the pigmented rats had a threshold of −5.0 log cd/m2. These values are close to −5.3 log cd/m2, the psychophysical threshold of human observers in the same apparatus. Consistent with our earlier electrophysiology, these behavioral experiments provide no evidence for an albino/pigmented sensitivity difference. Comparisons are made between behavioral and electrophysiological determinations of absolute threshold in albino and pigmented rats. Thresholds determined behaviorally agree remarkably well with those derived from visual evoked potentials. |
Databáze: | OpenAIRE |
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