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Saachi (2007) Changing history: doctored photographs affect memory for…

- - - - Strengths
        
        Controlled environment
        
        Internal validity
        
        Controlled extraneous variables
        
        Standardised procedure
        
        Increases reliability (replicable)
      - Weaknesses
        
        Artificial setting
        
        Lacks ecological validity (external validity)
- - - - -photographs and the questions were presented in a printed questionnaire.
      - -Participants were instructed to answer every question
      - -There was no time limitation to complete the task
      - On the first page of the questionnaire, participants saw both photographs.
        
        They then answered the question ‘Can you tell
        what major public event of the past 15 years is depicted in each of the following photos’?
        
        On the next page, one of the two photographs (e.g. Beijing) appeared again, this time
        accompanied by a caption indicating the event and when it took place.