Delayed matching to sample in pigeons: Effects of delay of reinforcement and illuminated delays
Section snippets
Experiment 1
In Experiment 1 there were four groups. All pigeons were trained on 0-s delayed matching with red and green sample and comparison stimuli. Following acquisition, two groups of pigeons were transferred to delayed matching with mixed delays of 0, 2, 4, and 8 s between the offset of the sample and the onset of the comparison stimuli. For one group, the delays were dark as is typically the case. For the other group the delays were lit. The remaining two groups were transferred to a delay of
Experiment 2
The purpose of Experiment 2 was to determine the extent to which the decline in matching accuracy with increasing delay between sample offset and comparison onset was due to loss of memory for the sample or to the novelty of the delay. To accomplish this, we trained pigeons with delays from the start. There is evidence that training with delays can greatly reduce the decline in memory with increasing delay (Dorrance, Kaiser, & Zentall, 2000; see also, Rayburn-Reeves & Zentall, 2009). Once
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