The tendency to remember the first piece(s) of information given to us is known as the primacy effect. Many psychologists propose that the primacy effect may be a result of rehearsal. Participants may be able to rehearse previous items in the list before being introduced to new ones (repeating the first item in their head by itself, then the first followed by the second when it is presented, then the third after the first two items, and so on). Therefore, items at the start of the list are more likely to be rehearsed than middle and end items. Slower presentation rates allow participants to rehearse a larger number of items, causing a larger primacy effect.