Bahrick

• what did Bahrick et al(1975) research

  duration of LTM
• Bahrick et al's procedure

  studied 392 American participants aged 17-74

  tested recall in 2 ways:

  1.photo recognition of 50 photos

  2.free recall of names in their graduating class
• findings of Bahrick

  tested within 15 years of graduation= 90% accuracy in photo recognition

  after 48 years= recall of 70% in photo recognition

  after 15 years= 60% accuracy in free recall

  after 48 years= 30% accuracy in free recall
• conclusion of Bahrick's findings

  shows that LTM may last up to a lifetime for some material
• strengths of Bahrick

  high external/ecological validity( investigated meaningful memories) - suggests it is a real estimate duration of ltm

  reliable findings ( research support)
• limitations of Bahrick

  lacks representativeness- only American and only up to age 74

  poor control (e.g. how many people they were still in contact with from high school)