Table 2. Summary of methodological details and materials.
| Study characteristics | |
|---|---|
| N (whereof female) | 76 (41) |
| Mean age (s.d.) | 25 (3.5) |
| Reimbursement | 50€ |
| Day 1 (trials per CS type) | Habituation (7), acquisition (14) |
| Day 2 (trials per CS type) | Extinction (14), RI-test (7) |
| Visual material CS | 2 Gray fractals (340 × 320 pixel) × presented for 6–8 s (mean: 7 s) |
| Visual material ITI | White fixation cross-presented for 10–16 s (mean: 13 s) |
| US type | Digitimer DS7A constant current stimulator (Digitimer, Elwyn Garden City, UK) to the back of the right hand with a 1-cm diameter surface electrode with a platinum pin (Specialty Developments, Bexley, UK). It consisted of three 10-ms rectangular pulses with an interpulse interval of 50 ms |
| Reinforcement ratio | 100% |
| RI background | Cue background (grey screen without fixation cross) |
| N RI USs | 3 |
| Time gap last CSext−first USri | 30 s |
| Time gap between USs | 5 s |
| Time gap last USri−first CSri-test | 13 s |
| Time gap RI context onset and RI | 5 s |
| Dependent measures | SCR, BOLD response (fMRI), ratings |
| Subjective ratings | Fear/stress/tension ratings (most recent encountera) on a 25 stepped VAS (anchored at 0 and 100), retrospectively after each experimental phase |
| Questionnaires | STAI-S, STAI-T30 and NEO-FFI31 |
Abbreviations: BOLD, Blood-oxygen-level dependent; CS, conditioned stimulus; fMRI, functional magnetic resonance imaging; NEO-FFI, NEO Five-Factor Inventory; RI, reinstatement; SCR, skin conductance response; STAI-S, State-Trait Anxiety Inventory - state; STAI-T, State-Trait Anxiety Inventory - trait; US, unconditioned stimulus; VAS, visual analogue scale.
a
Except for after RI-test where also the first presentation after RI was retrospectively rated.