Table 2.
Order of Stimulus Presentation and Bolus Injections by Block
| PET condition | Block no. | Stimulus type (% of random trials) |
|---|---|---|
| Scout injection | 1 | Random (100) |
| Injection 1 EARLY | 2 | Sequence (17) |
| Practice | 3 | Sequence (17) |
| Practice | 4 | Sequence (17) |
| Injection 2 MIDDLE | 5 | Sequence (17) |
| Practice | 6 | Sequence (17) |
| Practice | 7 | Sequence (17) |
| Injection 3 LATE | 8 | Sequence (17) |
| Practice | 9 | Sequence (17) |
| Practice | 10 | Sequence (17) |
| Injection 4 SWITCH | 11 | Random (100) |
| Injection 7 BASELINE | 12 | Random (passive viewing; 100) |
| Injection 8 FIXATION | 13 | Centered stimulus (passive viewing) |
Note. A postexperimental questionnaire was conducted after the SWITCH condition. BASELINE and FIXATION conditions were given to participants undergoing positron emission tomography (PET) only.