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Objectively quantifying subjective phenomena: Measuring the flashed face distortion effect.

Yi Gao1, Minzhi Wang2, Dobromir Rahnev1

  • 1School of Psychology, Georgia Institute of Technology, Atlanta, GA, United States of America.

Cognition
|June 18, 2024
PubMed
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Quantifying visual illusions like the Flashed Face Distortion Effect (FFDE) is difficult. This study introduces an objective method to measure FFDE strength, overcoming biases of subjective ratings and revealing factors influencing the illusion.

Area of Science:

  • Psychology
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • Subjective phenomena, such as visual illusions, present challenges for objective quantification.
  • The Flashed Face Distortion Effect (FFDE) causes faces to appear distorted when presented in rapid succession.
  • Traditional FFDE measurement relies on subjective distortion ratings, which are prone to bias.

Purpose of the Study:

  • To develop and validate an objective method for quantifying the Flashed Face Distortion Effect (FFDE).
  • To overcome the inherent biases associated with subjective distortion ratings.
  • To explore modulating factors of the FFDE, including face eccentricity and inversion.

Main Methods:

  • Developed an objective quantification method using artificially distorted faces for discrimination tasks.
Keywords:
EccentricityFace distortionFace inversionObjective methodTemporal frequency

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  • Compared response bias in an illusion condition (15 successive face flashes) versus a control condition (single face flash).
  • Applied the objective method to assess the influence of face eccentricity, inversion, temporal frequency, and temporal gaps.

    • Main Results:

    • The objective method successfully quantified the FFDE, demonstrating a more liberal response bias in the illusion condition.
    • Established that face eccentricity, inversion, temporal frequency, and temporal gaps modulate the FFDE.
    • Validated the effectiveness of the objective approach in measuring subjective visual distortions.

    Conclusions:

    • The developed objective method provides a reliable means to quantify the FFDE, overcoming limitations of subjective measures.
    • This novel approach is generalizable and applicable to quantifying other subjective perceptual phenomena.
    • Understanding the FFDE's modulation by various factors offers insights into visual processing mechanisms.