Table 2.

Descriptive results and reliability estimates (α) of the adapted Inner Speech Scale, the Varieties of Inner Speech Questionnaire, Trait Anxiety Inventory, Barratt Impulsiveness Scale, executive functioning tasks, and reasoning measures.

Measure	Mean	SD	Skew	Kurtosis	α
1. ISS	56.70	7.91	−0.42	1.65	0.82
2. Self-critical	13.67	2.59	0.01	0.27	0.61
3. Self-reinforcement	13.20	2.85	0.02	−0.06	0.70
4. Self-management	15.61	2.25	−0.73	1.59	0.60
5. Social assessment	14.22	2.97	−0.18	−0.26	0.70
6. VISQ	67.10	11.14	−0.14	0.60	0.76
7. VISQ: dialogic IS	17.39	4.20	−0.71	0.11	0.74
8. VISQ: condensed IS	14.36	5.94	0.64	−0.22	0.81
9. VISQ: other people in IS	14.96	5.33	0.22	−0.34	0.77
10.VISQ: evaluative IS	20.40	2.74	−1.41	4.82	0.68
11. Trait anxiety	44.34	7.69	0.30	−0.48	0.83
12. Motor impulsiveness	15.84	4.37	1.26	1.77	0.80
13. Cognitive impulsiveness	14.89	3.19	0.72	0.20	0.69
14. Non-planning impulsiveness	16.97	4.42	0.56	−0.13	0.76
15. Star counting task	15.49	3.94	−40.40	0.01	0.73
16. Antisaccade task	46.01	11.03	−1.25	0.61	0.93
17. N-back task	45.93	9.18	−0.28	0.08	0.72
18. APM	24.44	5.02	−0.48	0.26	0.83
19. LPS	32.62	3.15	−0.60	1.70	0.71

Data from the cognitive measures were computed based on 164 participants. Data from the VISQ scores were based on 364 participants. ISS, Inner Speech Scale; VISQ, Varieties of Inner Speech Questionnaire; IS, Inner Speech; APM, Raven's Advanced Progressive Matrices, LPS, LPS reasoning scale.