Fig 1.
Design of the 4-stimulus suboptimal choice experiment using a spatial discrimination between two white keys.
The left alternative shows possible outcomes for choosing the Discriminative alternative while the right alternative shows the Nondiscriminative outcome.
Fig 2.
Design of the 3-stimulus suboptimal choice experiment using a spatial discrimination between two white keys.
The left alternative shows possible outcomes for choosing the Discriminative alternative while the right alternative shows the Nondiscriminative outcome.
Fig 3.
Design of the 2-stimulus suboptimal choice experiment using a visual discrimination.
The left alternative shows possible outcomes for choosing the Discriminative alternative while the right alternative shows the Nondiscriminative outcome.
Fig 4.
Experiment 1: Mean percentage choice (± SEM) of the Discriminative alternative as a function of session for Phases 1–3.
Vertical lines indicate phase changes, the horizontal line indicates indifference between the two altrnatives (50%), and the solid horizontal line indicates sessions where the left response key intermittently malfunctioned.
Table 1.
Average food reinforcers earned from each alternative across the last five sessions of Phases 1–3 in Experiment 1.
Fig 5.
Experiment 1: Mean logged latencies (± SEM) to choose (left panel) and terminal link responses (right panel) for Phases 1–3.
Fig 6.
Experiment 2: Mean percentage choice (± SEM) of the Discriminative alternative as a function of session for Phases 1–3.
Vertical lines indicate phase changes while the horizontal line indicates chance (50%).
Table 2.
Average food reinforcers earned from each altenrative across the last five sessions Phases 1–3 in Experiment 2.
Fig 7.
Experiment 2: Mean logged latencies (± SEM) to choose (left panel) and terminal link responses (right panel) to the terminal link stimuli for Phases 1–3.
Fig 8.
Individual fits of Eqs 3 and 4 on the average percent Discriminatve alternative choice as a function of Phases 1–3 in Experiment 1 (left) and 2 (right).