A significant part of couple therapy is the modulation of intensity. The work requires keeping intensity within an optimal range. Too much intensity and the process shifts outside of tolerance and into survival (Siegel, 2012; Porges, 2001, 2011). Too little intensity, and the work becomes descriptive and intellectual rather than experiential.

The first source of intensity comes from each individual’s blueprint. In short, the sum of their formative and relational experiences. Not as something passive, but as something that has shaped perception and experience. The blueprint acts as a filter. It biases perception and amplifies experience in specific areas, and is something each person brings into the relationship from the outset (Maturana & Varela, 1980, 1987; von Glasersfeld, 1995).

The second source of intensity is the caricature. The distorted, internalised version of the other that each individual develops over time. The structure of the caricature is shaped by the blueprint, but the specifics extend beyond it. It becomes the lens through which the partner is perceived and made sense of. What is encountered is no longer just behaviour, but the meaning already assigned to it. At best, the caricature is a simplified version of the other; at worst, it is a distortion.

The third source of intensity develops within the relationship itself. It is the interactional pattern that emerges between both partners, organised around movements of approach and withdrawal. These are not isolated behaviours, but directional tendencies in how each person manages proximity, pressure, and difference. The pattern shapes how each responds to the other and how sequences unfold over time, particularly under stress. The more rigid and polarised this movement becomes, the more intensity it generates. The friction is not incidental. It is inherent in how the interaction is organised and is continuously reinforced through day-to-day exchanges.

The fourth source of intensity operates within that interactional pattern. These are the specific behaviours that enact and drive the pattern in the moment. Corrosive actions such as referencing the past, assigning intent, blaming, shutting down, deflecting, or over-explaining are not the pattern itself, but the mechanisms through which it unfolds. In more approach-based dynamics, these behaviours tend to escalate and intensify contact. In more withdrawal-based dynamics, they tend to limit, deflect, or disengage. In both cases, they increase intensity directly within the interaction and shift it towards threat. Attention narrows, defensiveness increases, and the interaction reorganises around protection rather than engagement. These behaviours tend to align with each individual’s default way of managing intensity, which is why they are central to the work and are actively identified and interrupted.

The fifth source of intensity is the legacy of injury. The accumulation of unresolved interactions. Moments that did not land, ruptures that were not repaired, and experiences that were not acknowledged remain active within the relationship. This creates a raised baseline of intensity, meaning that no interaction is neutral. Each exchange already carries a level of activation before anything is said or done.

What happens in the present does not land on its own. It lands on top of this accumulated history. This is why relatively small events can trigger disproportionate reactions. The intensity is not only about what is happening now, but about what has been carried forward.

These sources are not separate. The blueprint and caricature shape perception. The interactional pattern determines the movement between partners. Corrosive actions escalate that movement in real time. The legacy of injury constantly increases the baseline intensity, preventing it from ever starting at neutral.

This has direct implications for how the work is sequenced.

The legacy of injury cannot be worked with while the interaction is still dominated by high levels of reactivity. If corrosive behaviours are still driving intensity, work on past injury collapses back into the current pattern. The past becomes another site of conflict. Conversations escalate and derail before anything can be processed.

For this reason, the first step is to reduce the intensity generated by corrosive behaviours and to begin restructuring the interactional pattern itself. This allows both partners to remain within a workable range of activation and to stay in contact with themselves and with each other.

Only then can the legacy of injury be engaged in a way that does not overwhelm the system.

The final source of intensity comes from the therapeutic process itself. It emerges from intervention. Structuring, interrupting, and redirecting the interaction introduce additional pressure into the system. Therapy disrupts what has become familiar and organised, and the system responds to that disruption (Bateson, 1972; Dell, 1982, 1985; Maturana & Varela, 1980).

In couple therapy, this is particularly pronounced. The work involves actively shifting the couple into different ways of interacting. These shifts generate intensity because they move the interaction away from what is known and predictable.

If the existing sources of intensity are already pushing the couple close to the limits of their tolerance, therapeutic intervention will push them beyond it. This is why the intensity generated by corrosive behaviours and the interactional pattern has to be modulated first. The couple needs to remain within a range where they can stay engaged, tolerate the disruption, and not revert into survival states.

Working with intensity in couple therapy requires holding all of these sources in view at the same time. The perceptual amplification shaped by the blueprint and caricature. The organised movement of the interactional pattern. The moment-to-moment escalation driven by corrosive actions. The accumulated weight of the legacy of injury. And the additional pressure introduced through intervention.

The task is not to eliminate intensity, but to modulate it with precision. To keep it within a range where the interaction can be experienced, observed, and reorganised, and where something different can begin to emerge.