Gibson's invariance hypothesis and the Ames oscillatory effect

Area of Science:

• Psychology
• Perception Science
• Visual Neuroscience

Background:

• The Ames effect, a perceptual phenomenon, has been explained through various theories.
• Previous explanations often rely on concepts like stored interpretations or static elements.

Purpose of the Study:

• To re-evaluate existing explanations of the Ames effect.
• To propose a functional-evolutionary theory of perception as a novel explanation.
• To identify the essential factor driving the Ames oscillatory effect.

Main Methods:

• Evaluation of previous explanations using a functional-evolutionary theory of perception.
• Rejection of theories based on stored interpretations and static elements.
• Analysis of subject reports (Ss) describing perceptions during object viewing.

Main Results:

• Adaptive response to ambiguity is identified as the core factor in the Ames effect.
• Perception of rotation, oscillation, reversal, and flapping are correlates of retinal image contraction/expansion.
• These correlates support a functional-evolutionary approach to perception.

Conclusions:

• The Ames effect is best understood as an adaptive response to visual ambiguity.
• This perspective aligns with Gibson's theory of perception.
• Explaining the effect through functional-evolutionary principles offers a robust framework.