English to Italian Medical Medical (general) attivazione del sistema simpatico e parasimpatico nelle diverse forme di attaccamento

Care colleghe e colleghi,
come tradurreste "bias" nel contesto riportato di seguito, che descrive le differenze di attivazione del sistema simpatico e parasimpatico in differenti tipi di relazioni di attaccamento.
Avrei pensato a "tendenza all'attivazione" del sistema simpatico/parasimpatico ma forse esiste un termine più preciso?
Grazie mille per l'aiuto!

**********************************

Lanius’s findings of two types of PTSD are congruent with Schore’s proposal (1994) that the core difference between the two types of structured insecure attachment trauma is that one is organized by hyper- and the other by hypoarousal. That is, anxious-ambivalent attachment trauma results in a sympathetic (hyperaroused/upregulated) autonomic bias, whereas avoidant trauma results in a parasympathetic (hypoaroused/down-regulated) bias. *** The sympathetic bias *** generates a hyperaroused set point, hyperaroused responses to stress, and an underregulated, impulsive personality. The parasympathetic bias results in a hypoaroused set point, hypoactivated responses to stress, and an overregulated/inhibited personality.