| 1 | Did the interventionist explain the token-earning criterion and exchange rule to the participant before the meal began? | 1 | 0 |
| 2 | Did the interventionist activate and visually present the 20-second oil timer at the moment the participant began a bite? | 1 | 0 |
| 3 | Did the interventionist measure the interresponse time (IRT) from the onset of one bite to the onset of the next bite? | 1 | 0 |
| 4 | Did the interventionist immediately provide a token when the IRT was 20 seconds or longer? | 1 | 0 |
| 5 | Did the interventionist withhold the token when the IRT was shorter than 20 seconds? | 1 | 0 |
| 6 | Did the interventionist provide the predetermined backup reinforcer when the participant earned 10 tokens? | 1 | 0 |