Factors affecting accuracy of EWT:Anxiety

• What were Johnson and Scott's aim?

  to investigate how anxiety affects the accuracy of EWT and facial recognition
• Give  limitations of Johnson and Scott

  lacking ecological validity-anticipated something was to happen while they were waiting in the waiting room.

  broken ethical guidelines-pps were deceived and not protected from harm(psychological harm-feelings of stress,anxiety)
• What other case study contradicts Johnson and SCott?(evaluation)

  Yuille and Cutshall-investiagted effects of a real life shooting.On ekilled one wounded.

  13/21 witnesses participated in the study, where they were called back 4/5 months later and asked a series of questions

  Found that the major details of their reports remained the same barring a few minor details eg age,height

  anxiety at time of event had little or no effect of memory, showing that EWT is not impacted.
• Why did Johnson and Scott get these findibgs?

  Found that those who had seen the knife focused on the weapon,weapon focus effect, rather than facial recognition. Tjis is due to higher levels of anxiety, reducing EWT
• What were JOhnson and Scotts findings?

  Those who had witnessed the man holding the pen identified the man 49%

  33% holding knife.
• What were Johnson and Scotts procedure?

  Invited participants into a lab where they were asked to wait in a waiting room.receptionist left pps to run an errand

  Cond 1- pps heard a discussion about equipment failure.a man then comes out holding a pen with grease all over his hands.

  cond 2- pps heard a heated exchange followed by the sound of glass breaking and clashing chairs.A man then runs into reception holding  ak knife.

  both groups shown 50 photos and asked to identify the man they saw.