The term “neuroplasticity” appears to have originated in 1948 by a Polish scientist named Jerzy Konorski although there’s established ties to the field of psychology dating back to the late 1800’s, specifically through William James and his book “The Principles of Psychology” in 1890.
With my background in physical therapy, and in particular with the holistic model the Integrated Systems Model (or ISM – Diane Lee), the term “brain-training” (also known as connect+move training, neuroplasticity, or deep core training) has strong research evidence dating back to the 1970’s with an abundance of iron-clad evidence throughout the 1990s and 2000s.
Further yet, the term “neurolinguistic programming”, another form of brain-training, was developed in the 1970s by John Grinder and Richard Bandler (both have backgrounds in philosophy, psychology, and the field of self-help), although their work was largely based on the earlier work of Dr. Milton Erickson, a psychiatrist and psychologist.
I have no doubt you can read on google and Wikipedia just as easily as I can, but the message I’m hoping to convey is that neuroplasticity (brain-training) concepts have been around for centuries, with an abundance of research evidence across a variety of fields such as physical therapy, psychology, philosophy, science, self-help, and language studies.