Face Aftereffects Improve Discriminability for Similar Faces

Chen (Roger) Zhao, Peter Hancock

Research output: Contribution to conferencePosterpeer-review

Abstract

Previous studies have demonstrated a face-identity aftereffect that facilitates face-identification performance (Leopold et al, 2001 Nature Neuroscience 4 89 - 94). Adaptation should improve discrimination between faces in the region of the adapting stimulus, but this has not previously been demonstrated. We report an investigation on face discrimination, using faces distorted with Photoshop spherize function making them either expanded or compressed. We did psychophysical experiments on thirteen participants using an adaptive Bayesian method in order to present stimuli efficiently and effectively. The participants were adapted to systematically distorted faces (-160% or +160 and then tested on discrimination sensitivity around both +160% and -160 The results show that discrimination is facilitated at -160% after repetitive adaptation to -160% faces, but not significantly facilitated at +160% following adaptation to +160 Overall, there is a significant shift in discriminability with adaptation condition. We conclude that face discrimination can be facilitated at the point of adaptation but that demonstrating such an improvement will require a more tightly controlled stimulus presentation protocol.
Original languageEnglish
Publication statusPublished - 2007
Event30th European Conference on Visual Perception - Arezzo, Italy
Duration: 27 Aug 200731 Aug 2007

Conference

Conference30th European Conference on Visual Perception
CountryItaly
CityArezzo
Period27/08/0731/08/07

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