“Nobody can develop freely in this world and find a full life without feeling understood by at least one person.” – Paul Tournier
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When we speak of development, we too often think only of the child, as if learning, growth, and transformation are theirs alone. But the journey is not solitary. It is shared. The child and the adult move together. They shape and are shaped by one another. I call this interwoven process of mutual development synontogeny.
Synontogeny describes a central feature of Parallel Development: the idea that progress in the child is bound to the growth of their adult mediators, parents, teachers, therapists and others who devote themselves to the child’s wellbeing. Development is not a one-way street; it is a transactional journey of connection, of co-adaptation and reciprocal learning.
Synontogeny, mutual development, is closely aligned with intersubjectivity, the shared feelings, understandings and actions that emerge from interpersonal interactions and mediated learning experiences.
Every child is an open, adaptive human being, full of potential that only another conscious being who is attuned, intentional and responsive can fully reach. The quality of those interactive, reciprocal human relationships enables real developmental changes with increasing self-reliance to progress. The child learns within these authentic interpersonal relationships, and so do their adult mediators.
As adults increase their awareness of how they communicate, how they behave, and how they present themselves in a relationship with the child, the child responds in kind.
As the child’s interest and confidence grow, their understanding deepens, they are more willing to engage and to explore. In turn, the adult is changed by the child’s changing responses. The adult becomes more insightful, more attuned to the child and to themselves, more patient, and more effective. There is a mutual shaping, a reciprocal parallel process of connection, learning and adaptation.
This dynamic is not abstract. It is present in daily life, in the smallest interactions. A child who was once isolated and disengaged begins to join their parents and siblings in shared play and interactive learning experiences. As the adult mediator adjusts their tone and pacing, the child becomes more receptive and engaged. These are not just accommodations. They are relational achievements, shared activities, shared problem-solving, interpersonal feelings, and understandings that lead to mutual transformation.
Children with developmental differences often need more intensive, individualized mediation. But they also need something deeper, a belief that they can connect and learn, that their efforts matter, that they are seen and heard. Adults who believe in them, who adjust their expectations and methods not just to the diagnosis but to the real living child, become co-constructors of development.
And while the child grows in understanding, so does the adult. Adult mediators become less narrowly defined by professional or parental roles. They become part speech therapist, part occupational therapist, part interpreter of behavior and emotion. The adult becomes more connected and successful by helping the child to become more connected and successful. Each informs the other.
Children learn not only in classrooms or clinics. They learn through relationships with people who adapt, who listen, who feel the child, and who stay. The communication a child uses with their therapist is used with their parents and with playmates. The coordination they gain in an occupational therapy task becomes the movement they bring into play and into self-help activities. The child generalizes their progress not through isolated skills but through connected relationships.
The adult learns from the child what the child needs to learn. And as the child responds, the adult becomes a more responsive and effective guide. The developmental path is co-constructed, recursive, and dynamic. Within the adult-child relationship, reciprocal feedback shapes not only behavior but affective resonance and cognitive alignment.
Synontogeny has neuropsychological and educational implications. Feedback loops operating between the child and their adult mediators influence interactive connections within and between developmental domains, language, cognition, emotion, sensory processing, and motor skills. Changes in one system lead to changes in others. Synontogeny emphasizes this reciprocity.
As the adult mediator adjusts their communication, the child’s participation changes. As the child learns to engage, the adult’s sense of purpose and competence is renewed. As the child shows curiosity or initiative, the adult modifies the interaction, introducing new levels of complexity.
The adult adjusts their goals, their styles, and their beliefs as the child’s connection, skills, and understandings evolve. The shared interaction becomes a medium for mutual growth.
Gradually, for the child with developmental delays, there is a progression from dependency to interdependence, and then to greater self-reliance. This is not linear. It is recursive and adaptive development. With each loop, both the child and the adult gain insight, flexibility, and resilience.
The underlying principles of synontogeny align with broader systems-thinking. Just as a developing brain is shaped by feedback from its environment, the quality of mediated learning relationships is shaped by mutual influence. Just as biological systems in an organism communicate and collaborate to support functional integration, parents, teachers, and therapists learn from the child, and learn from and collaborate with each other.
I know synontogeny is in use when I hear parents, teachers, and therapists say something like “I didn’t just learn how to help this child, I learned who they are, and I learned who I am.” That is synontogeny in practice. The child is not merely the recipient of instruction; they are also the instructor. They teach the adult how to reach them, how to grow alongside them.
Children and adults are more alike than different. Both need structure and spontaneity, recognition and belonging, freedom and safety, understanding, ability to predict, to progress and to succeed, real purpose and meaning. And both are shaped by the quality of their relationship.
Synontogeny reminds us that we are never truly alone in our development. Our growth is always tied to others through shared challenges, shared discoveries and shared moments of meaning. Synontogeny is the foundational process of becoming for a child and for ourselves.
Copyright © 2025 Shlomo Chaim
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