Slide 4-8

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.

Slide 4-9

This is what the behavior obtained from pigeons under a fixed-interval schedule looked like. This is not at all what would be expected.

Slide 4-10

First, there are several "bands" of interresponse times with few interresponse times of intermediate durations.

Slide 4-11

The mean value of these bands is constant across the entire IRI.

Slide 4-12

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.

Slide 4-13

Finally, they are equally spaced and they occur at integer multiples.