In the present paper, the connection between the fields of neuroscience and psychoanalytic clinical data is examined. Emphasis is placed on the effect each field has on the other, regarding the shaping of the infant's brain through its early interaction with caregivers, giving rise to a procedural knowledge concerning relationship formation from birth onwards. Non-repressed experiences from this period emerge in the analytical relationship through primary modes of communication: the voice, gesture, and emotional expression. By working on and elaborating events in the transference/countertransference, transformations occur as a result of the reactualisation of the analysand's preverbal, subjective experiences, which until then were neither conscious nor verbalised. They remained not integrated obstructing further symbolisation work. Analytical work on these non-represented, non-repressed traumatic experiences can support a new co-created inscription of the patient's mental life, enabling the incorporation of these experiences into the psychic organ as well as many of the therapeutic changes we observe.