Table 3.

Bivariate Correlations Between HF-HRV and Regional Cerebral Blood Flow

LnHF	CBF	pHIP	Put	dACC	MFG	vACC	AMY	lIns	rIns	Cere	HIP	STG1	dPCC	PcG	STG2
All	.15**	−.12*	−.14**	−.04	−.02	.03	−.12*	−.15**	−.10*	.01	−.12**	−.13**	.05	−.03	−.18**
Cau	.22**	−.12*	−.14**	.05	.04	.08	−.11*	−.13*	.07	.00	−.14**	−.15**	.00	−.04	−.20**
AA	−.08	−.18	−.16	−.34**	−.25*	−.26*	−.20	−.19	−.16	−.04	−.12	−.13	.03	−.03	−.13

n = 362 for Caucasian Americans.

n = 63 for African Americans.

n = 432 for the entire sample.

Note. Correlations are presented separately for the entire sample (All). As the brain areas for the entire sample were based on prior directional associations, one-tailed significance testing was applied. Two-tailed significance is reported for the separate Caucasian and African American samples. ROI values are scaled as a proportion of global CBF. Prior to scaling, correlations with ROIs were similar to those for global CBF (i.e., for all subjects, HF was related .09 to pHIP, .07 to posterior PUT, .12 to dACC, .13 to rostral MFG, .15 to sACC. Cau = Caucasian; AA = African American; Ln HF = log HF-HRV; CBF = global cerebral blood flow. See Table 2 for ROI abbreviations.

^*p < .05 (one-tailed only for All).

^**p < .01.