Task Force of the ESC/NASPE (1996). Heart rate variability: standards of measurement. Circulation 93(5).

Shaffer & Ginsberg (2017). An overview of HRV metrics and norms. Frontiers in Public Health 5:258.

Thayer et al. (2012). HRV and neuroimaging: a meta-analysis. Neurosci. Biobehav. Rev. 36(2).

Kim et al. (2018). Stress and heart rate variability: a meta-analysis. Psychiatry Investigation 15(3).

Radin et al. (2020). Wearable data for real-time illness surveillance. Lancet Digital Health 2(2).

Russell (1980). A circumplex model of affect. JPSP 39(6).

Phillips et al. (2017). Irregular sleep/wake patterns and delayed circadian timing. Scientific Reports 7:3216.

Saeb et al. (2015). Phone sensor correlates of depressive symptom severity. JMIR 17(7).

Lehrer & Gevirtz (2014). HRV biofeedback: how and why does it work? Frontiers in Psychology 5:756.

Zaccaro et al. (2018). Psycho-physiological correlates of slow breathing. Front. Hum. Neurosci. 12:353.

Feldman (2007). Parent–infant synchrony. J. Child Psychol. Psychiatry 48(3-4).

Costa et al. (2016). EmotionCheck: false heart-rate feedback regulates anxiety. UbiComp 2016.

Fitzpatrick, Darcy & Vierhile (2017). Woebot RCT. JMIR Mental Health 4(2).

Maples et al. (2024). Loneliness and suicide mitigation with chatbots. npj Mental Health Research 3:4.

Reis & Shaver (1988). Intimacy as an interpersonal process. Handbook of Personal Relationships.

Cuijpers et al. (2007). Behavioral activation: a meta-analysis. Clinical Psychology Review 27(3).

White & Epston (1990). Narrative Means to Therapeutic Ends. Norton.

Ryan & Deci (2000). Self-determination theory. American Psychologist 55(1).

Forer (1949). The fallacy of personal validation. J. Abnorm. Soc. Psychol. 44(1).

Turkle (2011). Alone Together. Basic Books.