Barrick 1975

• Who conducted the study on the duration of LTM?

  Harry Bahrick et al.
• How many American participants were studied in the LTM research?

  392 participants
• What was the age range of participants in the study?

  17 to 74 years old
• What type of materials were used in the Bahrick study?

  High school yearbooks
• What were the two methods used to test recall?

  Photo-recognition and free recall tests
• How many photos were included in the photo-recognition test?

  50 photos
• What was the accuracy of participants tested within 15 years of graduation for photo recognition?

  About 90% accurate
• What was the decline in photo recognition accuracy after 48 years?

  Declined to about 70%
• How did free recall accuracy compare to photo recognition after 15 years?

  Free recall was about 60% accurate
• What was the free recall accuracy after 48 years?

  About 30% accurate
• What does the study by Bahrick et al. suggest about the duration of LTM?

  • LTM may last up to a lifetime
  • Some material is retained for decades