They used the Posit-Science program which founder of VitaminDWiki has been using for over 10 years.
It is far better than the competition.
You can try about 30% of it for free on the web.
Includes a 2013 video interview of Dr/ Merzenich discussing Brain Plasticity
- Off topic: Brain Plasticity (best way to exercise your brain) – Interview Dec 2012
- Vitamin D pages containing "Dementia" in title (35 as of June 2021)
- Speed of processing training results in lower risk of dementia Nov 2017
Download the PDF from VitaminDWiki