Table 1.

Maximum likelihood estimates of risk attitude determinants in Study 2 based on the parietal ROI

Sphere radius (mm)	5	10	15	20	25	30
Risk tolerance (α)
—Parietal volume	0.694	1.114	1.499^*	1.781^*	1.781	1.806
	(0.711)	(0.714)	(0.734)	(0.850)	(0.976)	(1.062)
—Age	−0.003	−0.003	−0.004	−0.005	−0.005	−0.003
	(0.008)	(0.008)	(0.008)	(0.008)	(0.009)	(0.009)
—Female	−0.112^*	−0.121^**	−0.126^***	−0.119^**	−0.112^*	−0.114^*
	(0.053)	(0.044)	(0.038)	(0.041)	(0.049)	(0.049)
—Global volume	0.100	−0.399	−0.933	−1.304	−1.399	−1.561
	(1.138)	(1.244)	(1.306)	(1.478)	(1.661)	(1.752)
—Constant	0.602^*	0.597^*	0.611^*	0.617^*	0.635^*	0.652^*
	(0.283)	(0.301)	(0.301)	(0.308)	(0.320)	(0.318)
Noise (σ)
—Constant	1.062^***	1.052^***	1.042^***	1.043^***	1.053^***	1.056^***
	(0.149)	(0.147)	(0.147)	(0.149)	(0.149)	(0.149)

Risk attitudes were regressed on parietal volume, age, female, and global volume for each size of the sampled ROIs. Each column shows the estimated coefficients (SEs in parenthesis below each estimate) as a function of sphere size (5–30 mm radius). SEs were clustered on participant. Significant results are indicated by asterisks; N (total number of observations) = 1974. Note that parietal GM volume coefficients of 15- and 20-mm-radii spheres were significant in explaining individual differences in risk attitudes (Fig. 4A,C).
↵*p < 0.05,
↵**p < 0.01,
↵***p < 0.001.