category explainers
All Senwitt Journal posts in this category.
- May 26, 2026
Brain exercise vs brain training — a 2026 explainer
Same surface activity, different promise structure. The category distinction matters because the FTC sanctioned the broader of the two promises in 2016, and the 2014 Stanford consensus targeted the same marketing claims.
- May 26, 2026
Free vs paid brain exercise apps in 2026 — what you actually get
An honest, sourced look at the free-vs-paid question in the brain-exercise category. What the ad-supported tier actually costs you, what subscriptions tend to unlock, and which trade-off makes sense.
- May 26, 2026
How much brain exercise per day is enough?
An honest, sourced answer to the daily-dose question. The published deliberate-practice and habit-design literature points to a smaller number than most marketing implies — 5 to 15 minutes a day is enough.
- May 26, 2026
When should you start brain exercise — at 30, 50, or 70?
An honest, sourced answer to the 'what age should I start' question — what cognitive aging research actually supports, what it doesn't, and why the timing question is less load-bearing than the daily-habit question.