Fig. 7. Log (Left/Right) response ratios after each successive reinforcer for sequences L to LLLLLL reinforcers and R to RRRRRR reinforcers and discontinuations for the group average for conditions arranging conditional probabilities of .5, .7, .8, and .9.

Reinforcers that occurred on the left alternative are joined to the previous reinforcer by a solid line, and reinforcers that occurred on the right alternative by a dotted line. Discontinuations of the sequences are joined to no symbol, whereas reinforcers that occurred on the left key are joined to filled squares, and reinforcers that occurred on the right key are joined to filled circles. The unfilled triangles signify the overall condition mean log response ratio.