Experimental test of Bayesian saccade targeting under reversed reading direction

Area of Science:

• Cognitive Psychology
• Neuroscience
• Computational Linguistics

Background:

• Reading involves rapid eye movements (saccades) to process visual information.
• Oculomotor accuracy during reading is limited, showing random errors and systematic over/undershoot of word centers.
• These errors are influenced by saccade length.

Purpose of the Study:

• To investigate methods for reducing both random and systematic eye movement errors during reading.
• To test a Bayesian model of saccade planning using experimental data.
• To identify the factors contributing to improved oculomotor accuracy.

Main Methods:

• Participants (N=32) read German texts presented from right to left.
• Eye movements were tracked to analyze saccadic landing positions.
• Experimental data were used to validate a Bayesian saccade planning model.

Main Results:

• Reading right-to-left significantly reduced both random and systematic saccadic landing position errors.
• Experimental data aligned with the predictions of the Bayesian saccade planning model.
• A more precise sensory likelihood was identified as the key factor explaining error reduction.

Conclusions:

• Reading direction impacts oculomotor control and reading accuracy.
• Bayesian models can effectively predict and explain eye movement behavior during reading.
• Enhanced sensory likelihood in reading tasks can improve visual information processing efficiency.