Spatial Heterogeneity in Bistable Figure-Ground Perception.

Area of Science:

• Neuroscience
• Visual Perception
• Psychophysics

Background:

• Visual object appearance differs significantly across the visual field.
• Previous theories proposed neuronal undersampling as a cause for this spatial heterogeneity.
• Understanding visual field variations is crucial for visual processing research.

Purpose of the Study:

• To investigate the influence of retinal location on the perception of figure and ground in bistable images.
• To determine if neuronal undersampling or other factors explain spatial heterogeneity in visual perception.
• To explore the role of low-level visual sensitivity in perceptual biases.

Main Methods:

• Presenting bistable vase-face images at different retinal locations.
• Analyzing observer perception of figure and ground based on image position.
• Comparing perceptual biases for upright and inverted images.
• Evaluating explanations based on neuronal undersampling and processing biases.

Main Results:

• Perception of figure and ground in bistable images is dependent on the image's retinal location.
• Spatial patterns of perceptual biases remained consistent for both upright and inverted images.
• Neither neuronal undersampling for specific object categories nor general processing variability fully explained the observed biases.
• Idiosyncrasies in low-level visual sensitivity across the visual field provide a plausible explanation.

Conclusions:

• Retinal location significantly impacts figure-ground perception in bistable stimuli.
• Observed spatial perceptual biases are better explained by variations in low-level visual sensitivity than by higher-level processing or neuronal undersampling.
• This finding highlights the importance of considering retinal position and basic visual sensitivity in understanding visual perception.