Imagine for a moment that you have no memory of your past, perhaps because you suffer from Alzheimer’s or retrograde amnesia. Life would be painful and confusing. You would have only a vague understanding of what was going on around you, of who people were, and what events meant. You might not recognize old friends or relatives if you passed them on the street. You would find it difficult to do even the simplest of tasks such as driving to work (Where am I going?) or shopping for groceries (What am I doing here anyhow?).
You are that person who suffers from Alzheimer’s or amnesia if, as a student of psychology, you do not know the history of your field . . .