Table 4.

Principal component analysis.

	Neuroaffective Reserves	Behavioral Engagement	Affiliation
Metabolites
tNAA	.87	−0.07	.34
Glx	−0.04	.74	.24
Cho	−0.46	.62	.48
Trait Measures
Absorption	.80	−0.13	−0.18
Aggression	−0.71	−0.19	.02
Control-reversed	.11	.88	−0.11
Social Potency	.39	.45	.50
Social Closeness	−0.02	.06	.94

Factor loadings for the principal component analysis of resting metabolites in the dACC voxel and trait emotion in healthy volunteers, N = 20, see Methods for data quality and exclusions. PCA analysis was restricted to measures that were significant in the primary analyses. Factor loadings above 0.35 are indicated in bold . All metabolites are partial volume corrected. tNAA = total N-acetyl-aspartate and N-acetylaspartyl-glutamic acid. Glx = Glx complex. Cho = choline-containing compounds. Emotion was assessed using the Multidimensional Personality Questionnaire Brief Form (MPQ-BF). Measures of Agency: Social Potency, a measure of agentic positive emotion. Aggression, a measure of agentic negative emotion. Measures of Flexibility: Absorption, a measure of emotional range and capacity for emotional engagement across a wide range of internal and external stimuli. Control-reversed, a measure of the preference for spontaneous over planned activities. Discriminant Measure: Social Closeness, a measure of affiliation and social warmth, which is distinct from Social Potency. Three components with eigenvalues greater than 1.0 were extracted and a varimax rotation was applied. The three-factor solution explained 72.7% of the variance in neurometabolites and emotion.