Table 1.

Behavioral comparison between the sample selected for the fMRI session (“fMRI pool”) and the rest of the field survey respondents (“Others”).

Scale	fMRI pool (n = 267) Mean (SD)	Others (n = 268) Mean (SD)	t statistic (df = 533)	p-value	Cohen’s d
General radicalization (range: 1–7) α = 0.84	3.74 (1.57)	2.20 (1.30)	12.42	<0.001	0.95
Personal grievance (range: 1–7) α = 0.75	2.56 (0.97)	2.28 (0.84)	3.61	<0.001	0.31
Collective narcissism (range: 1–7) α = 0.85	5.18 (1.25)	4.54 (1.51)	5.37	<0.001	0.45
Delinquency inventory (range: 1–12) α = 0.92	4.37 (3.59)	2.90 (3.36)	3.68*	<0.001	0.41
Endorsement of militant jihadism (range: 1–7) α = 0.83	2.56 (1.28)	1.70 (0.97)	8.78	<0.001	0.71

^*Degrees of freedom: 302 (231 participants did not complete the delinquency inventory).