Quotes from Kenneth L. Higbee

You have probably heard the saying that you can't teach an old dog new tricks. Actually, there is another saying that is probably more accurate, but is not quite as well known: 'The quickest way to become an old dog is to quit learning new tricks.

Another book gives the illusion of scientific precision by working out this reasoning in a mathematical formula using a "Mental Performance Ratio (MPR)

We have seen that there are two misconceptions involved in the myth that memory is a thing. One is that memory is a thing (a tangible structure rather than an abstract process) and the other is that memory is a thing (one memory rather than many memories).

You cannot build a complete memory with a single memory tool any more than you can build a complete building with a single carpentry tool.

When a person asks how he can improve his memory, he cannot expect a useful answer until he makes his question more specific. What kind of material does he want to remember? In what way? [How will his memory be measured?] Under what circumstances? For how long? There are methods and principles in this book that apply to almost any kind of learning situation, but none applies to all situations