"Scientists have recently determined that it takes approximately 400 repetitions to create a new synapse in the brain—unless it is done with play, in which case, it takes between 10 and 20 repetitions!"—Dr. Karyn Purvis

The twitter thread trying to track down the research supporting the statement is here:

https://twitter.com/heartsatplay/status/998737978133438465

Or maybe you would rather have your doctor try these instead?

MIT research laid groundwork for promising Alzheimer's-fighting drink November 2017

With this statement in it:The mixture increases production of new synapses and restores connectivity between brain regions, improving memory and other cognitive functions.

Or this one?

Recovery after stroke improved with new treatment that creates nerve synapses in the brain, a key factor for learning: Study January 2017

Which delivers C3a peptide thru nasal drops in mice. So your stroke hospital needs to followup with human research, they've only had 3+ years to get that accomplished.

 

 The unknown research here:

 "Scientists have recently determined that it takes approximately 400 repetitions to create a new synapse in the brain—unless it is done with play, in which case, it takes between 10 and 20 repetitions!"—Dr. Karyn Purvis