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Stimulus size modulates idiosyncratic neural face identity discrimination.

Lisa Stacchi1,2, Roberto Caldara1,3

  • 1Eye and Brain Mapping Laboratory (iBMLab), Department of Psychology, University of Fribourg, Fribourg, Switzerland.

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Individual differences in neural facial identity discrimination (FID) are consistent. Reducing stimulus size to 6.7° visual angle with fixation below the nasion optimizes FID measurement by minimizing variations.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Human facial identity discrimination (FID) exhibits significant interindividual variability.
  • These variations are stable over time and linked to individual facial information sampling strategies.
  • Understanding and mitigating these variations is crucial for reliable neural FID research.

Purpose of the Study:

  • To investigate if reducing stimulus size can decrease interindividual variations in neural FID.
  • To identify optimal stimulus size and fixation location for minimizing neural FID variability.

Main Methods:

  • Electrophysiological responses were recorded while manipulating face stimulus size (3°–12° visual angle) and fixation location (eye, nasion, nose, mouth).
  • Face stimuli of the same identity were presented at 6 Hz, with different identities periodically inserted to elicit neural FID.
  • Objective index of neural FID was triggered by the presentation of different identity faces.

Main Results:

  • Robust and consistent individual differences in neural FID were observed across all tested face sizes and viewing positions.
  • Facial identity discrimination was optimal for most observers when faces subtended 6.7° visual angle with fixation below the nasion.
  • This specific condition (6.7° visual angle, fixation below nasion) proved most effective in reducing interindividual variations.

Conclusions:

  • Individual differences in neural FID are a persistent characteristic of face perception.
  • A stimulus size of 6.7° visual angle with fixation below the nasion provides a benchmark for measuring neural FID.
  • This optimized condition is valuable for studies where controlling for observer idiosyncrasies is challenging.