The shape and line exemplars used for the various stages of the attentional set-shifting paradigm in Experiments 1 and 2
| Discrimination | Exemplars |
|---|---|
| Experiment 1 | |
| Simple | S1+ S2− |
| Simple reversal | S1− S2+ |
| Series of compound discriminations (CD1,CD2) | |
| Compound discrimination prior to surgery (CD3) | S5+ S6− |
| L5 L6 | |
| Surgery | |
| Retention test (CD3) | S5+ S6− |
| L5 L6 | |
| Two novel compound discriminations (IDS1,IDS2) | |
| Compound discrimination prior to EDS (IDS3) | S11+ S12− |
| L11 L12 | |
| Probe test | S11+ S12− |
| L13 L14 | |
| Extra-dimensional shift (EDS1) | L15+ L16− |
| S15 S16 | |
| Compound reversal (EDS1R) | L15− L16+ |
| S15 S16 | |
| Two novel compound discriminations (IDS4,5) and reversals (IDS4R,5R) | |
| Compound discrimination prior to EDS2 (IDS5R) | L19− L20+ |
| S19 S20 | |
| Second extra-dimensional shift (EDS2) | S21+ S22− |
| L21 L22 | |
| Compound reversal (EDS2R) | S21− S22+ |
| L21 L22 | |
| Experiment 2 | |
| Simple | P1+ P2− |
| Simple reversal | P1− P2+ |
| Surgery | |
| Retention test | P1− P2+ |
| Compound discrimination (IDS1) | S1+ S2− |
| L1 L2 | |
| Two novel compound discriminations (IDS2,IDS3) | |
| Compound discrimination prior to compound reversal (IDS4) | S7+ S8− |
| L7 L8 | |
| Compound reversal (IDS4R) | S7− S8+ |
| L7 L8 | |
| Compound discrimination (IDS5) | S9− S10+ |
| L9 L10 | |
| Compound reversal (IDS5R) | S9+ S10− |
| L9 L10 | |
| Probe test | S9+ S10− |
| L11 L12 | |
| Extra-dimensional shift (EDS) | L13+ L14− |
| S13 S14 | |
| Compound reversal (EDSR) | L13− L14+ |
| S13 S14 |
The examples given illustrate the precise sequence of discriminations for those monkeys trained initially on “shapes.”
S, L, Dimensions of shape and line, respectively; P, pattern; 1–22, individual line and shape exemplars; +, −, reinforcement value of the stimulus. Letters and numbers in bold indicate which dimension is relevant.