Are There Qualitative Differences between Face Processing in Photographic Positive and Negative?

@article{Liu1998AreTQ,
  title={Are There Qualitative Differences between Face Processing in Photographic Positive and Negative?},
  author={Chang Hong Liu and Avi Chaudhuri},
  journal={Perception},
  year={1998},
  volume={27},
  pages={1107 - 1122}
}
The question whether face recognition in photographic negative relies more on external features and pictorial cues than in photographic positive was studied in five experiments. Recognition of whole faces as well as both external and internal features of the faces was compared in experiments 1 and 2. The conditions in which views of faces between learning and test were either identical (hence providing maximum pictorial cues) or different (hence reducing such cues) were compared in experiments… 

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