Effects of face configuration change on shape perception: a new illusion

Area of Science:

• Cognitive psychology
• Visual perception
• Human face processing

Background:

• The perception of geometric shapes can be influenced by contextual visual information.
• Facial features possess unique configurations that are readily processed by the human brain.

Purpose of the Study:

• To investigate how the spatial configuration of facial features affects the perceived shape of a surrounding geometric form (an oval).
• To determine if face-specific processing underlies this perceptual illusion.

Main Methods:

• Two experiments were conducted using frontal-view face photographs presented within an oval aperture.
• Participants viewed faces with manipulated feature positions (eyes, nose, mouth) and reported the perceived shape of the oval.
• The orientation of the face and the relative positions of major features were systematically varied.

Main Results:

• Moving facial features towards the oval's boundaries resulted in the oval being perceived as taller and narrower (elongated).
• Moving facial features towards the center (nose) resulted in the oval being perceived as shorter and wider (rounder).
• The illusion was strongest for upright faces with features in their typical relative locations.

Conclusions:

• The configuration of facial features significantly alters the perceived shape of a co-present geometric shape.
• This suggests that high-level face processing mechanisms can influence the perception of basic geometric forms.
• Further research is needed to ascertain if this is a face-specific illusion or a broader geometric phenomenon.