Cited data, every number footnoted.
The data pages cite published cohort studies — every number footnoted to a verified source. No fabrication, no rounding to round headline numbers.
AI use and cognitive skill self-reports (2025-2026)
Published survey data on what knowledge workers say about AI's effect on their cognitive skills — drawn from Pew, BCG, Microsoft+Carnegie Mellon, and HBR coverage. Self-report, not measured cognition.
Average reaction time by age (adults)
Published cohort ranges for simple visual reaction time across adult age groups, with every number footnoted to a primary source. No fabricated stats.
The brain training app market in 2026 — size, growth, players
What the published market data on brain training apps actually says in 2026 — market size in GBP and USD, growth projections, market share by player, with sources.
Working memory span by age (digit span norms)
Published cohort norms for digit-span working memory by adult age group, drawn from the clinical neuropsych literature. Ranges, not point estimates. No fabrication.