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  3. Horizontal Image Compression Significantly Impairs Human Face Identity Recognition.
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  3. Horizontal Image Compression Significantly Impairs Human Face Identity Recognition.

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Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues
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Horizontal image compression significantly impairs human face identity recognition.

Alexandros Venetis1, Bruno Rossion2

  • 1Université de Lorraine, CNRS, IMoPA, F-54000 Nancy, France.

Brain Research
|June 25, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Face identity recognition (FIR) is surprisingly sensitive to horizontal image compression. Neural markers show significant declines in recognition accuracy as faces become more compressed, challenging previous assumptions.

Keywords:
ElectroencephalographyFace-identity recognitionFast periodic visual stimulationGeometric distortionHorizontal compression

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Area of Science:

  • Cognitive Neuroscience
  • Neuroscience
  • Psychology

Background:

  • Face identity recognition (FIR) is crucial for social interaction.
  • Prior research suggested FIR is resilient to image compression, implying limited reliance on spatial cues.
  • Limited evidence exists on FIR's response to single-axis image compression.

Purpose of the Study:

  • To objectively quantify the impact of single-axis image compression on neural markers of FIR.
  • To investigate the effect of horizontal compression on implicit neural responses during single glances.

Main Methods:

  • Twenty-one participants viewed unfamiliar faces under varying horizontal compression levels (0-90%).
  • Electroencephalography (EEG) recorded neural responses to identity changes.
  • Analysis focused on occipito-temporal cortex activity at 1.2 Hz harmonics.

    • Main Results:

    • Robust FIR neural responses were preserved at 22% compression.
    • Responses sharply declined with increasing compression, with 40% reduction at 67% compression.
    • Near-complete suppression of FIR responses occurred at 90% compression.

    Conclusions:

    • Single-axis, particularly horizontal, image compression significantly impacts human FIR.
    • Distortion of feature distances, local shapes, and overall structure contribute to FIR impairment.
    • Findings challenge the notion that FIR is largely unaffected by single-axis image compression.