Making A Case

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  • Making A Case
    • Interviewing Witnesses
      • Loftus: Weapon Focus
        • Lab exp.
        • 36  University of Washington students.
          • Half recruited via ads & paid £3.50 and others participated for extra credits for psychology.
        • 18 slides of events in a Taco Time restaurant.
          • IV: second person in queue pulls a gun on the cashier for experimental group and cheque for control
          • DV: recognition of that person.  Measured by 20 item multiple choice questionnaire.
            • Shown 12 photos in random sequence & asked to rate how confident they were on their identification on a scale of 1-6.
        • 38,9% in control & 11.1% in experimental.
          • E.F.D: 3.72 secs on gun and 2.44 on cheque.
      • Bruce: External & Internal Features In Facial Recognition
        • Exp:1; 30 staff and students from Stirling Uni, paid £2 to sort the composites.
          • G2: composites with internal features.
          • G1: complete composites.
          • G3: external feature.
          • 42% external features sorted correctly & 19.5% of internal.
        • Independent measure design with 3 conditions.
          • Match the correct composite image to the celebrity from the 40 composites given.
            • Exp:1; 30 staff and students from Stirling Uni, paid £2 to sort the composites.
              • G2: composites with internal features.
              • G1: complete composites.
              • G3: external feature.
              • 42% external features sorted correctly & 19.5% of internal.
        • Exp:2,
          • 44 volunteered undergrads at Stirling Uni.
          • Identify the celebrity composites from the photo array.
          • Easy: very different from the target face. Hard: very similar to target face.
          • External identified 42% and internal 24%.
      • Fisher & Geiselman: Cognitive Interview
        • Interview similarity, focused retrieval, extensive retrieval & witness-compatible questioning.
        • Field Experiment.
        • 16 detectives from the robbery division of Dade County.
        • Asked to record a selection of their next interviews using their standard techniques.
          • Took 4 months & 88 interviews were recorded, mostly of bag snatches and robberies.
        • Divided into 2 groups. 1 trained in CI techniques
          • 7: CI & 9 non. Training done over 4*60 mins sessions.
        • Interviews then recorded over 7 months & were analysed by a team at the Uni of California who were blind to the condition. The info from both group was collated.
        • CI group elicited 47% more info than before & 63% more info than the untrained group.

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