Scope of evidence — what Senwitt does and does not claim.

Three independent published positions converge on the same verdict about broad cognitive-transfer marketing in this category. (1) The 2014 Stanford Center on Longevity / Max Planck Institute consensus statement, signed by 70 neuroscientists and psychologists, warned that brain-training claims commonly outran the evidence. (2) The 2016 Simons et al. review in Psychological Science in the Public Interest(DOI 10.1177/1529100616661983) synthesized the literature and concluded that broad cross-domain carry-over claims were not well supported. (3) The 2016 FTC settlement with Lumos Labs ($2M, with $50M judgment suspended) specifically targeted advertising claims about school, work, athletic, and age-related cognitive improvement.

On the AI-era side, the 2025 Kosmyna et al. cognitive-debt paper (arXiv:2506.08872) documented EEG-level differences between brain-only, search-engine, and LLM-using essay writers. The paired Stanković et al. (2026) critique (arXiv:2601.00856) flags methodology concerns; both must appear together for intellectual honesty. The Sparrow et al. 2011 Google-effect paper (Science 333:776–778) and the Risko & Gilbert 2016 cognitive-offloading review (Trends in Cognitive Sciences 20(9):676–688) document the wider pattern: people who expect to retrieve information later remember less of it.

Senwitt's evidence-informed pitch sits exactly inside what these sources support: regular practice maintains the skills you practice. Stop practicing, and the skills fade. Nothing more, nothing less.

The literature does not support the broader claims the brain-training category historically used. It does not support claims that brain-game practice generalizes to better school performance, better work performance, better athletic outcomes, or slower age-related cognitive change. It does not support IQ-improvement claims. It does not support claims about preventing or treating cognitive decline, dementia, or Alzheimer's disease.

The cognitive-debt literature does not support the headline framing of “AI makes you dumber.” The Kosmyna paper describes self-reported and EEG-level differences in essay writing under different tool conditions, not a general cognitive deficit. The Stanković critique flags small sample size and reproducibility limits; we cite it alongside Kosmyna because intellectual honesty requires it.

For Senwitt, the practical consequence is everywhere: the home, the product explanation, the claim-boundary block on comparison pages, the medical-disclaimer footer on every research page, the verbatim §1 text we use across the site. Marketing copy stays inside what daily practice can actually do. No medical claims. No cognitive-transfer claims. No IQ-improvement claims.

For the reader, the takeaway is the same. If you want a daily practice habit for thinking skills you want to keep using, Senwitt is built for that. If you want a medical product, a cognitive assessment, or a brain-training program that promises broad cognitive improvements, Senwitt is not built for that — and the published evidence base does not support a product that was.