Article Abstract:
The probability and topography of key-pecking varies systematically with the type of reinforcer. The response rates and time allocation indicate a significant preference for the key that signals food, inspite of food and water deprivation in pigeons. The food-key gape amplitudes increase with prewatering and decrease with prefeeding without any consistent effect upon water-key gapes. Reacquisition is faster for probability, rather than for topograhy measures. The response from modulation proceeds through the generation of intermediate gape size.
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Article Abstract:
An experiment examined how pigeons reacted under autoshaping contingencies where different conditional stimuli were linked with unconditional stimuli of different quantities over consecutive trials within a session. Results showed that key-peck and gape rates, key-peck and gape latencies, gape amplitudes, and beak resting positions during food-associated conditional stimuli varied with the magnitude of the unconditioned stimulus of pellet size.
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Article Abstract:
Primary reinforcement has a clear effect on initial-link response in concurrent-chains schedules. Choice proportions by 12 pigeons were shown to favor initial-link stimulus correlated with the larger reinforcer.
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