This next set of frames provides a stylized representation of the actual data obtained from pigeons in order to simplify the discussion of the salient features of behavior.
This is what the behavior obtained from pigeons under a fixed-interval schedule looked like. This is not at all what would be expected.
First, there are several "bands" of interresponse times with few interresponse times of intermediate durations.
The mean value of these bands is constant across the entire IRI.
The variance in the interresponse time bands is the same regardless of the absolute interresponse time value and regardless of the time in the interval.
Finally, they are equally spaced and they occur at integer multiples.
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