Individuals' eye movements in reading are highly consistent across time and trial

Area of Science:

• Cognitive Neuroscience
• Psychology
• Ophthalmology

Background:

• Eye movements are crucial for studying cognitive processes like attention, memory, and language.
• Previous research often assumes eye movement stability without sufficient evidence.
• Understanding eye movement reliability is key for interpreting individual differences and clinical applications.

Purpose of the Study:

• To examine the reliability and stability of various eye movement measures during reading in healthy individuals.
• To assess the consistency of eye movement behaviors across different sessions and within trials.
• To determine if individual differences in sensitivity to lexical variables are stable over time.

Main Methods:

• Thirty-nine participants completed a reading task in two sessions, one month apart.
• Key eye movement metrics (fixation duration, saccade amplitude, etc.) were recorded and analyzed.
• Statistical comparisons were made between sessions and across trials within each session.

Main Results:

• All measured eye movement behaviors demonstrated high stability within individuals across sessions and trials.
• The ex-Gaussian distribution components of fixation durations were also consistently stable.
• Individual differences in responses to lexical variables (e.g., word frequency) remained stable over time.

Conclusions:

• Eye movements during reading are reliably stable within individuals over time and across trials.
• This high reliability validates the use of eye tracking for studying cognitive functions and their neural basis.
• Findings support the application of eye movement analysis in cognitive development research and longitudinal studies.