Multiple research studies on
emotional contagion have found that it only takes milliseconds for emotions like enthusiasm and joy, as well as sadness, fear, and anger, to pass from person to person, and this often
occurs without either person realizing it (Goleman, 1991, Hatfield et al., 2014).
Instead, according to interpersonal theories of depression (Coyne 1976; Joiner and Timmons 2009),
contagion may
occur when adolescents with high levels of depressive symptoms engage in maladaptive interpersonal interactions, breeding negative
emotional states in their relational partners and possibly exacerbating their depressive symptoms.