Table 1.

Constructs and measures.

Trait Measures	Constructs
	Flexibility		Agency		Valence
	Emotion	Behavior	Positive	Negative	Positive	Negative
1. Absorption	√
2. Control-reversed		√
3. Social Potency			√		√
4. Aggression				√		√
5. Social Closeness					√
6. Stress Reaction						√
7. Alienation						√

Emotion constructs were evaluated using measures of trait emotion on the Multidimensional Personality Questionnaire Brief Form (MPQ-BF). Trait measures of emotion are in column 1. Emotion constructs of primary interest are in columns 2 to 7. Absorption provides a measure of the flexibility of emotion (col. 2). Control-reversed provides a measure of behavioral flexibility (col. 3). Social Potency provides a measure of positive agency (col. 4). Aggression provides a measure of negative agency (col. 5). Scales of non-agentic valenced emotion were included for purposes of discriminant validity. These are Social Closeness, which measures non-agentic positive emotion (col. 6), and Stress Reaction and Alienation, which measure non-agentic negative emotion (col. 7). The measures provide an orthogonal test of the relationships between ¹ H MRS metabolites, agency, flexibility and valence (see Methods).