Eye-movement patterns for perceiving bistable figures

Area of Science:

• Cognitive Psychology
• Neuroscience
• Visual Perception

Background:

• Bistable figures elicit alternating percepts, with eye fixation hypothesized to influence perception by focusing on specific features.
• Inhibition of return (IOR) is a mechanism where prolonged attention to a location suppresses reallocation to it, promoting shifts in visual attention.

Purpose of the Study:

• To investigate the relationship between eye fixation patterns and percept reversals in bistable figures.
• To determine the role of inhibition of return (IOR) in the process of percept shifts.
• To explore how manipulating local saliency affects fixation patterns and perception.

Main Methods:

• Utilized eye-tracking technology to record eye movements and percept reversals during observation of the duck/rabbit and Necker cube figures.
• Conducted experiments manipulating inward bias and local saliency (using masks) to observe their effects on perception and eye movements.

Main Results:

• Distinct eye fixation patterns were observed for different percepts, with fixation shifts preceding percept reversals.
• Inward bias significantly affected the initial percept of the duck/rabbit figure, but this effect decreased over time.
• Masking local saliency increased percept reversals and fixation shifts, demonstrating that changes in saliency drive attention shifts and perceptual changes.

Conclusions:

• Perceptual outcomes of bistable figures are directly linked to eye fixation locations and dynamics.
• Fixation shifts, driven by saliency changes and potentially modulated by IOR, are critical for initiating percept reversals.
• Visual attention allocation, as reflected in eye movements, fundamentally determines subjective visual experience.