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How to Build a Dichoptic Presentation System That Includes an Eye Tracker

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Coupled dynamics of bistable distant motion displays.

Frederic Benmussa¹, Charles Aissani, Anne-Lise Paradis

¹CNRS-UPMC-INSERM, CRICM UMR 7225, France. benmussa.frederic@gmail.com

Journal of Vision

|July 27, 2011

Summary

Periodic visual changes can influence perception in a separate display, especially when displays are symmetrical. This suggests long-range brain connections may synchronize perception across visual fields.

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Area of Science:

Neuroscience
Visual Perception
Cognitive Psychology

Background:

Perceptual interpretation can be influenced by external stimuli.
Bistable perception involves ambiguous stimuli that can switch between two interpretations.
Understanding interhemispheric communication is crucial for cognitive neuroscience.

Purpose of the Study:

To investigate how periodic physical changes in one display (inducer) affect perceptual switches in a separate, bistable display (probe).
To examine the factors influencing coupling strength and bistable dynamics, including display ambiguity, similarity, symmetry, and spatial location.
To explore the potential of bistable dynamics as a behavioral method for probing interhemispheric connectivity.

Main Methods:

Four experiments were conducted using distinct inducer and probe displays.
Varying degrees of ambiguity, similarity, and symmetry in motion characteristics were employed.
The spatial locations of the probe and inducer displays relative to the vertical meridian were manipulated.

Main Results:

Periodic fluctuations in a remote inducer display were found to influence and regulate a bistable probe display through coupling.
Coupling strength was strongest when both displays were symmetrical around the vertical meridian and weaker otherwise.
Smaller effects of common fate and symmetry were also observed, indicating their influence on coupling.

Conclusions:

Long-range interhemispheric connections, likely involving the corpus callosum, can synchronize perceptual transitions across the vertical meridian.
Bistable dynamics may offer a novel behavioral paradigm for assessing interhemispheric connectivity in humans.
Findings have implications for research designs utilizing stimuli symmetrical around the vertical meridian.