Research on duration: AO3

• Limitation: Meaningless stimuli in STM study (Petersons)

  What? Stimuli artificial

  Who? Petersons' study doesn't reflect most everyday memory activities

  Why? Lacks external validity
• Strength: High external validity (Bahrick)


  What? Bahrick et al. - High external validity

  Who? Investigated meaningful memories; Shepard - meaningless pictures mean recall rate lower

  Why? Reflect a 'real' estimate of duration of LTM