Defintion:

Fillers are the "preferred non-mentalizing narratives" that tend to prevail in any family when misunderstandings arise.

E.g. Repeated (and often repetitious) attempts to declare, or draw conclusions, about who did what, when, what someone should or shouldn’t do, and crucially whose fault it is.

Response to Fillers:

The therapist uses Mentalizing manoeuvres to slow down interactions and focus the spotlight on how feelings were experienced, communicated (or mis-communicated) and reacted to, and how cycles of non-mentalizing interactions are thus perpetuated.