Food-deprivation level alters the effects of morphine on pigeons' key pecking

Article Abstract:

Research was conducted to study the effects of food deprivation and morphine administration on pigeons' key pecking maintained by multiple schedule of food presentation. Morphine sulfate was dissolved in sterile saline and administered in relation to the body weight of the animals. The decreased ability of large doses of psychomotor stimulants suppressed food-maintained behavior rates. Results suggested that common mechanisms may be responsible for parallel changes in behavior produced by the level of food deprivation on the effects of drugs on food-maintained operant behavior.

Animal feeding and feeds, Deprivation (Psychology), Emotional deprivation

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The effects of morphine on fixed-interval patterning and temporal discrimination

Article Abstract:

Studies of conventional external stimuli show morphine affects response patterning. Pigeons' behavior under the influence of morphine showed disruptions in temporal discrimination in a fixed-interval schedule.

Psychological aspects, Reaction time, Reaction time (Psychology), Morphine

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Pigeons may not remember the stimuli that reinforced their recent behavior

Article Abstract:

Research indicates differences in conditioned reinforcing efficacy and memorability due to brief delay signals. Results based on response rates of white pigeons.

Statistical Data Included, Memory, Conditioned response, Conditioned responses

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