Process Monitoring — Mentalization-Based Treatment

Continuous observation by the therapist of three key parameters throughout the session: (1) the client's level of mentalization, (2) the level of emotional arousal, (3) the degree of activation of the attachment system. These three parameters determine the choice of interventions at every moment. The aim — to maintain the optimal zone: enough emotion that the inquiry is meaningful, but not so much that mentalization breaks down.

Step-by-step guide

Continuously track the non-verbal markers of arousal: changes in voice, posture, facial expression, breath
Assess the quality of mentalization: is the client speaking flexibly or rigidly? Are they taking the perspective of others?
Determine the degree of activation of attachment: does the current theme touch significant relationships?
Choose the level of intervention: high arousal → empathy, validation; medium → clarification, challenge; low → mentalization of the relationship
Switch flexibly between the levels as the client's state changes

When to use

Continuously, throughout the session — this is a background process
Especially important at transitions between themes
Critical when discussing trigger themes (attachment relationships, losses, betrayals)

Key phrases

I notice that it has become more intense for both of us. Let us slow down.

Follow-up questions

It seems to me we are now in a good place for inquiry. What do you think?

Alternative phrasings

(Internal cue) Arousal is rising — moving to validation.

(Internal cue) The client has become rigid — mentalization is at risk.

Warnings

⚠️ Monitoring must not paralyze the therapist — over time it becomes automatic
⚠️ Errors in the assessment of the level — are normal; what matters is the ability to correct quickly
⚠️ The therapist's own arousal also needs to be monitored

Source: Bateman A.W. Fonagy P. (2016). Mentalization-Based Treatment for Personality Disorders