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Related Experiment Videos

Catching the bad guy: morphing composite faces helps.

Lisa E Hasel1, Gary L Wells

  • 1Psychology Department, Iowa State University, Ames, Iowa 50011, USA. lhasel@iastate.edu

Law and Human Behavior
|October 21, 2006
PubMed
Summary
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Morphing composite faces from multiple eyewitnesses improved likeness to the target. However, this technique also created a prototype effect and attractiveness bias, impacting accuracy for less attractive targets.

Area of Science:

  • Cognitive Psychology
  • Forensic Science
  • Facial Recognition Technology

Background:

  • Eyewitness composite faces are often inaccurate representations of the target individual.
  • Combining multiple composites through morphing offers a potential method to improve facial likeness.

Purpose of the Study:

  • To investigate the effectiveness of morphing composite faces from multiple eyewitnesses.
  • To identify potential biases, such as prototype effects and attractiveness bias, in the morphing process.

Main Methods:

  • Composite faces were generated by eyewitnesses.
  • Multiple composites were digitally morphed together.
  • Ratings of morphs and individual composites were compared to target and non-target faces.
  • Statistical controls were applied for prototype and attractiveness biases.

Related Experiment Videos

Main Results:

  • Morphs were rated as more similar to the target face than individual composites.
  • A significant prototype effect emerged, where morphs resembled non-target faces more than individual composites resembled targets.
  • An attractiveness bias was observed, reducing morph effectiveness for less attractive targets.
  • A true morph-superiority effect persisted even after controlling for biases.

Conclusions:

  • Morphing composite faces can enhance likeness to the target but introduces significant biases.
  • The prototype effect and attractiveness bias can distort facial recognition accuracy.
  • Despite biases, a residual morph-superiority effect suggests potential benefits for eyewitness identification procedures.