TABLE 5.
Overview of means, mean differences and p-values on the Stroop Task.
| Study | Serotonergic psychedelic | Control | Weight | Mean difference | ||
|---|---|---|---|---|---|---|
| Mean (SD) | N | Mean (SD) | N | |||
| Stroop - Word list (p = 0.85; I 2 = 86%) | ||||||
| Barbosa et al. (2016)* | 94.25 (14.49) | 29 | 99.41 (15.49) | 27 | 18.2% | −0.34 [−0.87, 0.19] |
| Bouso et al. (2012)–Jungle sample | 86.36 (17.95) | 56 | 77.38 (19.49) | 56 | 20.5% | 0.48 [0.10, 0.85] |
| Bouso et al. (2012)–Urban sample | 94.11 (16.78) | 71 | 82.27 (15.62) | 56 | 20.7% | 0.72 [0.36, 1.08] |
| Doering-Silveira et al. (2005a) | −16.2 (3.89) | 40 | −14.75 (3.34) | 40 | 19.5% | −0.40 [−0.84, 0.05] |
| Halpern et al. (2005) | (−51.1) 9.8 | 61 | −48.4 (8.4) | 78 | 21.0% | −0.30 [−0.63, 0.04] |
| Stroop–Color list (p = 0.24; I2= 82%) | ||||||
| Barbosa et al. (2016)* | 74.21 (9.13) | 29 | 72.74 (12.50) | 27 | 17.9% | 0.13 [−0.39, 0.66] |
| Bouso et al. (2012)–Jungle sample | 62.2 (12.08) | 56 | 57.09 (12.58) | 56 | 20.6% | 0.41 [0.04, 0.79] |
| Bouso et al. (2012)–Urban sample | 69.27 (15.25) | 71 | 55.09 (14.11) | 56 | 20.7% | 0.95 [0.58, 1.33] |
| Doering-Silveira et al. (2005b) | −13.03 (2.27) | 40 | −12.6 (2.22) | 40 | 19.5% | −0.19 [−0.63, 0.25] |
| Halpern et al. (2005) | −62.8 (10.4) | 61 | −62.0 (10.7) | 78 | 21.3% | −0.08 [−0.41, 0.26] |
| Stroop–Incongruent list (p = 0.03; I2= 73%) | ||||||
| Barbosa et al. (2016)* | 48.13 (8.29) | 29 | 44.52 (7.48) | 27 | 16.8% | 0.45 [−0.08, 0.98] |
| Bouso et al. (2012)–Jungle sample | 44.36 (18.81) | 56 | 34.25 (8.68) | 56 | 20.7% | 0.69 [0.30, 1.07] |
| Bouso et al. (2012)–Urban sample | 45.87 (13.78) | 71 | 36.02 (11.7) | 56 | 21.3% | 0.76 [0.40, 1.12] |
| Doering-Silveira et al. (2005a) | −24.95 (7.14) | 40 | −25.05 (8.0) | 40 | 19.2% | 0.01 [−0.43, 0.45] |
| Halpern et al. (2005) | −115.1 (22.6) | 61 | −114.7 (23.2) | 78 | 22.0% | −0.02 [−0.35, 0.32] |
* = Means and standard deviation courtesy of Barbosa et al.; N, sample size; SD, standard deviation