The evidence for consciousness in newborns is getting stronger, but a brain recording cannot tell us what being a baby feels like. Carl Zimmer follows researchers trying to identify when subjective experience begins by looking for patterns that accompany awareness in adults—and by asking how much those patterns really prove.
A person’s brain typically registers an unexpected sound in a repeated sequence with a distinctive response. Newborns produce a similar signal. Scans from the Developing Connectome Project also show regions of infant brains working together in networks resembling those of awake adults. Neither finding is a consciousness meter: some candidate markers fail to appear in other infant experiments, and the researchers want several independent signs to converge.
The question has a history with consequences. Doctors once treated babies as if they could not experience pain, and anesthesia was routinely withheld during newborn surgery as recently as the 1980s. Research on how their brains process pain helped overturn that practice. That history argues for care in our assumptions, not for pretending a response to pain settles every question about awareness.
The earliest possible onset remains uncertain. The connections needed to integrate sensory information are not in place before roughly 26 weeks of gestation; that does not establish the moment consciousness starts. Most experts in one survey thought infants had some consciousness by birth. A minority disagreed. And even if newborns are conscious, their experience need not resemble a diminished adult version: their brain activity shows forms of complexity that invite a more expansive, still untested account of how they perceive the world.