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Traditional accounts have emphasized the cerebral cortex as the seat of conscious awareness, largely due to its expansion and complexity in humans. However, converging evidence suggests that the foundations of consciousness lie not in higher cognition, but in more ancient subcortical systems responsible for affective experience. Central among these are the ascending arousal networks of the upper brainstem and the periaqueductal gray, which together sustain wakefulness and imbue it with valence. This reframing positions consciousness as an embodied biological function grounded in feeling, rather than as a component of higher cognition. From a developmental perspective, the relevant subcortical structures mature relatively early in gestation, raising the possibility that a primitive form of subjective feeling may emerge during the third trimester, well before cortical maturation. Such a view has far-reaching ethical consequences, informing debates on fetal pain perception, neonatal care, and the treatment of individuals with profound cognitive impairment. By synthesizing recent neuroscientific findings with developmental data, this paper argues for a subcortical basis of consciousness, and highlights the need for an integrative approach that situates the origins of consciousness within affective brainstem systems.<\/jats:p>","DOI":"10.1007\/s00429-026-03113-9","type":"journal-article","created":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T04:48:25Z","timestamp":1777351705000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["When does consciousness arise? 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