Statistically, Enneagram Type 1 corresponds to the ISTJ profile in Jungian typology. When communicating with a Type 1, it is essential to understand their neurological responses. Type 1s are guided by a strict inner sense of right and wrong, and they come under strong stress when they believe they are "imperfect" or that "something must be wrong with them". This deep fear of imperfection triggers a marked sympathetic response (the fight-or-flight activation of the nervous system), which pushes them to prove their perfection and correctness.

From a polyvagal perspective, this drive for perfection can be read as an attempt to leave a perceived "zone of unsafety", marked by strong dorsal vagal activation (the branch of the vagus nerve that slows the body down and leads to withdrawal). This activation reflects a retreat into conservation and minimal contact with the outside, as if to protect oneself from further judgement or threats to one's self-worth. In pursuing perfection, Type 1s often set aside their own needs, and this creates an inner struggle that is both obsessive and compulsive.

The underlying "False Core" belief (the conviction that they are fundamentally flawed) drives their actions and thoughts and sums up their inner conflict. Deeply rooted and resistant to change, this belief keeps a cycle of effort and frustration going: every attempt to prove their worth confirms the original premise of imperfection.

Communicating effectively with a Type 1 therefore means taking these inner dynamics into account. It means creating an environment that feels safe, free of triggers for a strong sympathetic response, such as any suggestion of error or wrongdoing. The aim is to avoid activating their dorsal vagal complex, which inclines them towards disconnection and self-protection, and to engage instead their capacity for social connection and openness.

The following sections set out the strategies and points to consider for meaningful communication with Type 1s, so as to bridge the gap between their inner struggle and authentic, empathetic connection.

Imagine relying mainly on abstract principles such as justice and fairness to guide your relationships, rather than on close connection with others. It may feel like standing firm on your principles; neurologically, however, it may point to an over-reliance on your dorsal vagal complex.

This part of the nervous system keeps you still and disconnected, focused on your own beliefs, without real engagement with the people around you. At the same time, your sympathetic nervous system may be accelerating, pushing you to assert your views and hold your position.

This simultaneous activation of the dorsal vagal and sympathetic systems creates a kind of inner deadlock, which makes deeper connection with others difficult. How, then, do you break this cycle and find new ways of being that bring you back into contact with your body and with the world around you?

One approach is to turn your attention to your sensory experience and anchor yourself in the here and now.

Presence, above all presence to one's own body, is a key point. Before we knew polyvagal theory, our non-verbal practice had already shown us how a rigid, principled person softens once attention returns to bodily sensation; the theory now accounts for this softening. Techniques that anchor you in your body and let you feel your inner sensations are therefore very effective.

Recall a time when you felt genuinely open and connected to others. Try to remember how it felt in your body: the sensations, the emotions, the energy that flowed through you. By returning to this state, you can begin to look at life through this openness and connection.

Imagine carrying this openness with you and letting it shape your interactions and your point of view. Notice how this shift changes your approach to life, making it richer, livelier and more connected. This is polyvagal theory applied: you draw on the body's innate knowledge to build deeper connections and a more fulfilling way of being.

The behaviour described above corresponds closely to Enneagram Type One, characterised by a strong sense of morality and ethics and by the wish to improve both themselves and the world. Type Ones are guided by principles of right and wrong and hold themselves and others to very high standards. This strict adherence to what they see as "correct" or "just" can correlate with activation of the dorsal vagal complex: it reflects a steadfast, even rigid, position that leads to a degree of disconnection from others. The Myers-Briggs Type Indicator (MBTI), and in particular the ISTJ type, shows an interesting overlap. ISTJs, known for their reliability, practicality and attention to tradition and rules, can show similar tendencies. The "I" (Introversion) may contribute to a preference for inward focus and reflection, which matches the withdrawal from social contact typical of dorsal vagal activation. The "T" (Thinking), which gives priority to logic and objective decisions over personal feelings or circumstances, can be linked to sympathetic activation: the sympathetic system prepares us for action, often through an analytical, detached approach to problems and decisions, in line with the "T" preference for logic and efficiency. In summary, Type One behaviour, especially when it coincides with the ISTJ profile, can show up as a dominance of dorsal vagal activation, visible in a principled and sometimes rigid stance, while the "T" component adds the action-oriented, logical drive of the sympathetic system. Seen from a polyvagal perspective, these dynamics open concrete paths for Type Ones and ISTJs towards more balanced and connected ways of relating to the world, softening their rigid adherence to principles and allowing more empathetic, engaged relationships with others.

Create an atmosphere of safety

Words that trigger strong sympathetic activation: "error", "wrong"

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Research notes

A selection of peer-reviewed studies on polyvagal theory and vagal function that offer a scientific reading of the topics discussed in this article.

Jüres F, Kaufmann C, et al. (2024). Heart rate and heart rate variability in obsessive-compulsive disorder: evidence from patients and unaffected first-degree relatives. Biological Psychology, 189, 108786. Patients with obsessive-compulsive disorder showed higher resting heart rate and lower HRV than healthy participants, although the HRV difference appeared mainly in medicated patients; findings in relatives were less clear. https://doi.org/10.1016/j.biopsycho.2024.108786

Olbrich H, Jahn I, et al. (2022). Heart rate variability in obsessive compulsive disorder in comparison to healthy controls and as predictor of treatment response. Clinical Neurophysiology, 138, 123-131. Unmedicated patients with obsessive-compulsive disorder had a higher heart rate than controls, and those who later responded to treatment showed greater baseline high-frequency power, suggesting parasympathetic activity as a possible predictor of response. https://doi.org/10.1016/j.clinph.2022.02.029

Chalmers JA, Quintana DS, et al. (2014). Anxiety disorders are associated with reduced heart rate variability: a meta-analysis. Frontiers in Psychiatry, 5, 80. This meta-analysis found reduced HRV in most anxiety disorders, but not in the small obsessive-compulsive subgroup (n = 40); it is a reminder that the autonomic profile of obsessive patterns is not yet settled. https://doi.org/10.3389/fpsyt.2014.00080