Stable individual differences in saccadic eye movements during reading, pseudoreading, scene viewing, and scene...

Area of Science:

• Cognitive Psychology
• Neuroscience
• Ophthalmology

Background:

• Individual differences in eye movement metrics (mean fixation duration, mean saccade amplitude) are observed during active viewing.
• Prior research suggests stability of these differences across tasks, hinting at underlying stable traits.
• The temporal stability of these individual differences over time remains largely uninvestigated.

Purpose of the Study:

• To investigate the stability of individual differences in eye movement characteristics over time.
• To determine if mean fixation duration and mean saccade amplitude are stable individual difference measures across multiple days.
• To extend the analysis of stability to standard deviations of fixation duration and saccade amplitude.

Main Methods:

• Participants engaged in 4 distinct active viewing tasks.
• Eye movement data, including fixation durations and saccade amplitudes, were recorded.
• Statistical analyses were performed to assess the stability of individual differences across tasks and over a multi-day period.

Main Results:

• Significant individual differences in mean fixation duration and mean saccade amplitude were confirmed across the 4 viewing tasks.
• These individual differences demonstrated stability over several days.
• The stability extended to the standard deviations of fixation duration and saccade amplitude.

Conclusions:

• Individual differences in eye movement metrics are stable across different viewing tasks and over time (several days).
• Eye movement characteristics, including mean and standard deviation of fixation duration and saccade amplitude, can serve as reliable individual difference measures.
• Findings contribute to theories of eye movement control and the application of eye tracking in individual difference research.