This was followed in 1936 by someone else, namely Lowell Thomas in the preface of the book How to win friends and influence people by the American writer Dale Carnegie, translated to: "Professor William James of Harvard used to say That the average person only develops 10 percent of his latent mental ability. " Minded, caring, and damaged cells ion z Another possibility is that the seed lies in observations of the brain itself. In his textbook Biological Psychology, the American psychologist James Kalat explains the ten percent myth as follows: there was for years believed that a certain group of common but very little brain cells, called local neurons' had no function - has been proven to the contrary. ..
