Perceptual reversals in binocular rivalry: Improved detection from OKN

Area of Science:

• Neuroscience
• Vision Science
• Ophthalmology

Background:

• Perceptual reversals in binocular rivalry correlate with oculomotor behavior.
• Smooth pursuit eye movements in optokinetic nystagmus often reflect the dominant perceived motion direction.

Purpose of the Study:

• To develop and validate an improved, automated analysis for continuously estimating perceived motion using eye movement data.
• To enhance the monitoring of binocular rivalry and perceptual state changes.

Main Methods:

• Developed a novel "cumulative smooth pursuit" analysis to create a continuous record of perceived motion from eye position data.
• Automated identification, interpolation, and probabilistic joining of smooth pursuit segments, robust across different populations.
• Validated the method by comparing its output to volitional reports of perceptual reversals in rivalry and control displays.

Main Results:

• Cumulative smooth pursuit accurately detects physical reversals and estimates eye velocity, outperforming existing methods.
• The method demonstrates precision in detecting dominant and transitional perceptual states, with changes identified within ±100 ms.
• The automated analysis proved robust in healthy, developmental, and patient populations.

Conclusions:

• Cumulative smooth pursuit offers a significant advancement in monitoring binocular rivalry by leveraging optokinetic nystagmus data.
• This automated approach provides a reliable and precise tool for studying visual perception and oculomotor behavior.