In September 1959, psychology researchers Lloyd and Margaret Peterson tested how quickly people forget information.1 The researchers asked their study participants to remember a random trigram , a three-letter group (e.g., KHZ). Next, the researchers gave the participants a three-digit number (e.g., 375). The participants were then instructed to count backward from the number by subtracting three (e.g., 372, 369, 366, etc.).
Set a timer for 12 seconds.
Count backward by three, starting with 375.
Look away from the page and return ...