Developmental Time vs. Research Time

Developmental time is biological: the rate at which synapses form, the span of critical periods, the trajectory of prefrontal myelination. It proceeds on its own schedule, indifferent to the pace of human deliberation. Research time is institutional: the funding cycles, the IRB approvals, the cohort recruitment, the years of follow-up, the peer-review process, the publication timelines. Christakis's television research required decades because it was built on the NLSY cohort, which had been tracking children since 1979. By the time the 2004 paper was published, the children whose television exposure it documented were adults. The AI timeline permits no such retrospection. ChatGPT launched in November 2022; Claude Code crossed its capability threshold in late 2025. The first AI-native cohort is passing through the sensitive period now. By the time longitudinal studies produce results, the cohort will have completed the sensitive period — their calibrations fixed, the window closed.