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Log response ratios (L/R) obtained before Reinforcers 1–5 (left column) and 6–10 (right column) across 10-session blocks for individual pigeons (rows) within components arranging 27∶1 (closed circles), 9∶1 (closed squares), 3∶1 (closed triangles), 1∶1 (x), 1∶3 (open triangles), 1∶9 (open squares) and 1∶27 (open circles).
