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Scientists are exploring the role of the brainstem in consciousness, challenging the dominant view that the cerebral cortex is its primary location. A new study distinguishes between access consciousness and phenomenal consciousness, suggesting that the brainstem may be crucial for the subjective experience of pain and self-awareness. Observations of patients with severe cortical damage who retain some consciousness support this idea. The researchers argue that the brainstem provides a primitive biological component essential for subjective experience, which machines lack. This research highlights the complexity of consciousness and its evolutionary significance, suggesting that the origins of conscious experience may lie deeper in the brain than previously thought.