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  • Title: The effects of face inversion and contrast-reversal on efficiency and internal noise.
    Author: Gaspar CM, Bennett PJ, Sekuler AB.
    Journal: Vision Res; 2008 Mar; 48(8):1084-95. PubMed ID: 18314157.
    Abstract:
    Inverted and contrast-reversed faces are identified less accurately and less rapidly than normal, upright faces. The effects of inversion and contrast-reversal may reflect different sampling strategies and/or different levels of internal noise. To test these alternative hypotheses, we used a combination of noise-masking and response-consistency techniques to measure the internal noise and high-noise efficiency associated with the identification of upright, inverted, and contrast-reversed faces. We found that both face inversion and contrast-reversal reduced efficiency, but did not change internal noise.
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