Detecting a nonevent: delayed presence-versus-absence discrimination in pigeons

Article Abstract:

An experiment studied pigeons which were trained on a delayed presence-versus-absence discrimination model where a sample stimulus was given on certain trials but not on others. In the first phase, performance on no-sample trials was not exclusive despite the fact that, without a memory trace, the no-sample choice alternative was theoretically related to a significantly higher probability of reinforcement than the sample choice alternative. In the second phase, performance come close to exclusive preference for the richer alternative for three of the four birds tested when sample trials were eliminated.

Memory, Signal detection (Psychology)

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Separating the effects of trial-specific and average sample-stimulus duration in delayed matching to sample in pigeons

Article Abstract:

A typical delayed matching-to-sample (DMTS) task involves the brief presentation of one stimulus, known as the sample, and, after an interval of time, two choice stimuli, one of which is identical to the sample. To understand how pigeons perform in such a task, experiments using DMTS tasks are conducted. Under these experiments, the reduction in delay to reinforcement signaled by the onset of the sample stimulus is manipulated by varying sample-stimulus duration. Results indicate that the delay-reduction value of the sample stimulus determines choice in a DMTS task.

Conditioned response, Conditioned responses

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Discrimination of methadone and cocaine by pigeons without explicit discrimination training

Article Abstract:

Previous research has obtained U-shaped gradients for pigeons subjected to certain stimuli. In one study, generalization gradients were obtained prior to explicit discrimination training. Using a procedure in which pigeons could peck only the training stimulus prior to tests of other wavelengths, the role of internal stimuli produced by methadone and cocaine on discriminative stimulus control over pecking is studied. Results indicate that discriminative control by the drugs can be established even without explicit discrimination training.

Discrimination learning, Stimulus generalization

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