Bruce - Internal and External Features in Facial Recognition

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Bruce - Internal and External Features in Facial R

Experiment One

The aim of the study was to see which were the most recognisable internal and external facial features.

The participants were 30 staff and students from Stirling University

The method was an independant measures design lab experiment.

Participants matched to 1 of 3 groups. 

Group 1 saw whole-head photos. Group 2 saw internal-features photos. Group 3 saw external-features photos.

The task was to match photo composites produced using different UK/US systems used by police, e.g. E-FIT, PRO-fit, etc, to the original photographs they were based on.

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Bruce - Internal and External Features in Facial R

Experiment Two

The aim was to compare the quality of internal and external composite features of the first experiment.

The participants were 48 undergraduate volunteers from Stirling University

The method was a Laboratory Experiment with an Independant Measures Design.

Participants were tested individually, randomly assigned to 1 of 4 "testing books".

Book 1 - Easy internal features | Book 2 - Hard internal features | Book 3 - Easy external features | Book 4 - Hard external features.

The task was to view a set of famous-face composites, then pick them out from a photo line-up, compromising of 1 celebrity and 5 foils.

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Bruce - Internal and External Features in Facial R

Results

Experiment 1 - Whole and external composities sorted 33% correct, internal composites only 19.5% correct

Experiment 2 - Composites of external features were identified better (42% correct) than internal features (28% correct). Performance better on E-FITS than PRO-fits.

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