Within the depth-psychology corpus housed in the Seba library, ‘Glimmers’ occupies a precise technical position within the polyvagal framework elaborated by Deb Dana and, foundationally, by Stephen Porges. The term designates micro-moments of ventral vagal activation — brief, often unnoticed flickers of safety, connection, and regulation that arise spontaneously in ordinary life. Unlike ‘triggers,’ which cue the autonomic nervous system toward sympathetic mobilization or dorsal vagal collapse, glimmers function as the countervailing signal: cues of safety registered below conscious threshold that, when attended to deliberately, can begin to shift the system toward regulation. The theoretical weight of the concept rests on the claim that the human negativity bias — an evolutionary inheritance ensuring attention to threat — systematically suppresses awareness of these positive micro-states, rendering intentional cultivation of glimmer-detection a genuine clinical intervention. Dana’s therapeutic mapping system formalizes this: the Triggers and Glimmers Map pairs the two poles of autonomic experience, making glimmers structurally visible alongside their more-familiar counterpart. Porges’s research anchor — citing Kok and colleagues (2013) on the enduring resource-building capacity of even brief positive emotion — gives the concept empirical grounding. The wider corpus beyond polyvagal sources does not meaningfully engage this term; it is, in the Seba library, exclusively a polyvagal-clinical concept.