PSYCH 3CC3 Lecture Notes - Lecture 20: Genetic Algorithm
4 Nov 2020
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Genetic algorithm to create computer facial constructions of suspects faces: 2 ways. Way 1: randomly generate several composites from face space using eigenfaces, witness chooses closest likeness, random variations around likeness leads to new set of composites, repeat from #2. Con: how closely does mugbook photo resemble person as he looked at time of crime: people can change features that can influence how they look like their hair. Wanted to see how accurate people were at picking the correct photo in mugbook based on where correct picture was placed in the mugbook. Placed 69 preceding foils and perpetrator"s photo at various locations in computerized mugbook (locations pics 1-70; 71-140; 141-210) The mugbook exposure effect: brown et al 1977. Phase 1: see 5 suspects" for 25 secs each, knowing they will later pick them from mugshots, and from lineup, 1. 5 hours later, 15 mugshots (15 secs each): 5 suspects" and 5 people to appear in later lineup.
