Somatic regulation — encompassing emotional regulation, co-regulation, and the broader governance of physiological arousal states — occupies a central and contested position across the depth-psychology corpus. The field divides broadly between neurobiological accounts, which anchor regulation in the autonomic nervous system and its hierarchical vagal architecture, and relational-developmental accounts, which foreground the dyadic scaffolding through which regulatory capacity is first acquired and later internalized. Porges and Dana, working within Polyvagal Theory, establish somatic regulation as fundamentally a social achievement: the ventral vagal state enables co-regulation with attuned others, and self-regulation is understood as a secondary, derivative capacity built upon repeated interactive regulation. Schore, approaching from neurobiology and attachment theory, specifies the orbitofrontal cortex as the critical cortical site mediating top-down ANS governance, and locates the developmental origins of regulatory range in dyadic affect exchanges during sensitive periods. Price and Hooven add a further dimension — interoceptive awareness — arguing that access to bodily signals is a prerequisite for emotional regulation rather than its outcome. DBT-oriented contributors such as Scott treat regulation as a teachable skill set, deliberately distanced from the neurophysiological substrate. The central tension persists between regulation-as-relational-process and regulation-as-individual-competence — a distinction with profound clinical consequences for trauma treatment, attachment repair, and addictions work.