“…Measures that may serve as starting points include those that are: observational (e.g., coding the content of verbal or nonverbal interactions); self-reports (e.g., questionnaires, interviews); field-based (e.g., ecological momentary assessment); population-level (e.g., ethnography); physiological (e.g., heart rate and respiration); neural (e.g., fMRI, PET, EEG); neuroendocrine (e.g., oxytocin and cortisol); and immunological (e.g., cytokine and granulocyte assays) (Coan, Schaefer & Davidson, 2006; Crowell et al, 2014; Ferrer & Helm, 2013; Janicki, Kamarck, Shiffman, & Gwaltney, 2006; Kiecolt-Glaser, Gouin, & Hantsoo, 2010; Levenson & Gottman, 1983; Rilling & Sanfey, 2011; Roche, Pincus, Rebar, Conroy, & Ram, 2014; Snyder, Heyman, & Haynes, 2005). Given the wide range of interpersonal and social processes implicated in health behavior change, as well as the overlap among targets, it has proven difficult to measure these targets consistently in the laboratory, in clinical trials, or in large scale observational studies.…”