Visual tracking efficiency across different spacing widths: a text-free eye-tracking study

Area of Science:

• Oculomotor control
• Visual perception
• Human-computer interaction

Background:

• Understanding spatial layout's impact on visual guidance is crucial for designing effective digital environments.
• Previous research often conflates visual tracking with reading processes.
• A text-free approach isolates low-level oculomotor and perceptual functions.

Purpose of the Study:

• To investigate the influence of spatial spacing on visual tracking efficiency.
• To quantify the effects of path shape (straight, curved, angular) and width on eye movement patterns.
• To establish a text-free eye-tracking paradigm for studying visual-perceptual load.

Main Methods:

• Utilized a novel text-free eye-tracking paradigm with 20 participants.
• Recorded eye movements using a Tobii Eye Tracker T120.
• Participants tracked straight, curved, and angular paths of varying widths (0.5-3 cm).

Main Results:

• Narrow angular paths (0.5-1 cm) showed significantly higher fixation counts and durations.
• Angular paths resulted in greater fixation counts and durations compared to straight and curved paths.
• Moderate spacing (approx. 2.5 cm) was associated with smoother visual guidance.

Conclusions:

• Constrained spatial layouts, particularly narrow angular paths, increase visual-perceptual load and decrease oculomotor fluency.
• Moderate spatial spacing (around 2.5 cm) optimizes visual guidance.
• Text-free visual tracking tasks effectively isolate perceptual and oculomotor processes relevant to spatial layout design.