In his memory studies, Ebbinghaus found that relearning a list of syllables took less time than learning it for the first time. However, the amount of time "saved" depended on the interval between initial learning and relearning - the longer the interval, the less time "saved". According to Ebbinghaus, the rate at which these "savings" decreased indicated
◻ individual differences in intelligence
◻ the rate at which information from the initial list was forgotten
◻ a recession
◻ the rate at which our brains process new information