I present empirical evidence suggesting that an infant first becomes aware of herself as the focal center of a caregiver's attending. Yet that does not account for her awareness of herself as agent. To address this question, I bring in research on neonatal imitation, as well as studies demonstrating the existence of a neural system in which parts of the same brain areas are activated when observing another's action and when executing a similar one. Applying these findings, I consider gestural (...) exchanges between infant and caregiver, such as reciprocal smiles and imitative vocalizations. Lacking self-awareness at first, the infant is unaware of her own agency. By returning her unwitting gesture, the caregiver singles out for her—thanks to neural matching—the gesture's kinesthesis. Moreover, the caregiver's smile, imitative vocalization, or other gesture is the form that focusing takes. The kinesthesis of the infant's gesture, in being singled out, is experienced by the infant as what the caregiver is focusing on. It is experienced as being within the focal center. In this way, the infant becomes aware of herself as a bodily entity acting toward the caregiver. Exchanges that involve matching are at first essential, I argue, in making the infant present to herself in action. Matching will cease to be necessary, but self-awareness continues to depend fundamentally on others until the acquisition of language, when the child becomes capable of talking to herself as if she were the caregiver. (shrink)

In 1975, Colwyn Trevarthen first presented his groundbreaking explorations into the early origins of human intersubjectivity. His influential model dictates that, during intimate and playful spontaneous face-to-face protoconversations, the emotions of both the 2–3-month-old infant and mother are nonverbally communicated, perceived, mutually regulated, and intersubjectively shared. This primordial basic interpersonal interaction is expressed in synchronized rhythmic-turn-taking transactions that promote the intercoordination and awareness of positive brain states in both. In this work, I offer an interpersonal neurobiological model of Trevarthen’s intersubjective (...) protoconversations as rapid, reciprocal, bidirectional visual-facial, auditory-prosodic, and tactile-gestural right brain-to-right brain implicit nonverbal communications between the psychobiologically attuned mother and the developing infant. These co-constructed positive emotional interactions facilitate the experience-dependent maturation of the infant’s right brain, which is in an early critical period of growth. I then address the central role of interpersonal synchrony in intersubjectivity, expressed in a mutual alignment or coupling between the minds and bodies of the mother and infant in face-to-face protoconversations, as well as how these right brain-to-right brain emotional transmissions generate bioenergetic positively charged interbrain synchrony within the dyad. Following this, I offer recent brain laterality research on the essential functions of the right temporoparietal junction, a central node of the social brain, in face-to-face nonverbal communications. In the next section, I describe the ongoing development of the protoconversation over the 1st year and beyond, and the co-creation of a fundamental energy-dependent, growth-promoting social emotional matrix that facilitates the emergence of the highly adaptive human functions of mutual play and mutual love. In the final section, I discuss the clinical applications of this interpersonal neurobiological model of intersubjectivity, which has a long history in the psychotherapy literature. Toward that end, I offer very recent paradigm-shifting hyperscanning research that simultaneously measures both the patient and therapist during a psychotherapeutic interaction. Using the Trevarthen’s two-person intersubjective model, this research demonstrates changes in both brains of the therapeutic dyad and the critical role of nonverbal communications in an emotionally-focused psychotherapy session. These studies specifically document interbrain synchronization between the right temporoparietal junction of the patient and the right temporoparietal junction of the clinician, a right brain-to-right brain nonverbal communication system in the co-constructed therapeutic alliance. Lastly, I discuss the relationship between the affect communicating functions of the intersubjective motivational system and the affect regulating functions of the attachment motivational system. (shrink)