Bilateral symmetry and perceptual reversals

Area of Science:

• Psychology
• Visual Perception
• Cognitive Science

Background:

• Reversible figures, like the Necker cube, demonstrate perceptual switching.
• The duration of each percept in bistable figures can be influenced by external stimuli.

Purpose of the Study:

• To investigate how imposed pattern symmetry affects the duration of fluctuating percepts in reversible figures.
• To determine the relationship between pattern symmetry and the difference in percept durations.

Main Methods:

• Presenting patterns with varying degrees of symmetry around the observer's median plane superimposed on a reversible figure.
• Measuring the duration each fluctuating percept was experienced.

Main Results:

• Pattern symmetry was associated with a reduced difference between the durations of the two percepts.
• This effect was strongest for enantiomorphic patterns that jointly formed a symmetrical whole.
• A similar, though less pronounced, effect was observed with symmetrical but unrelated patterns.

Conclusions:

• Visual pattern symmetry demonstrably influences perceptual stability and the subjective experience of time in reversible figures.
• The degree and nature of symmetry (enantiomorphic vs. unrelated) modulate the extent of this influence on perceptual duration.