Empirical Evaluation of Visual Fatigue from Display Alignment Errors Using Cerebral Hemodynamic Responses

Area of Science:

• Neuroscience
• Human-Computer Interaction
• Visual Display Technology

Background:

• Stereoscopic displays are increasingly common in various applications.
• Display alignment errors can potentially impact user experience and physiological responses.
• Understanding these effects is crucial for designing comfortable and effective visual systems.

Purpose of the Study:

• To investigate the impact of stereoscopic display alignment errors on visual fatigue.
• To examine prefrontal cortical tissue hemodynamic responses during visual display tasks with alignment errors.

Main Methods:

• Collected hemodynamic data and subjective visual fatigue ratings from participants.
• Participants performed visual display tasks on a large-scale projection system (8 ft × 6 ft NEC LT silver screen with NEC LT 245 DLP projectors).
• Analyzed statistical significance of differences in fatigue measures and hemodynamic responses (oxygenated and deoxygenated hemoglobin in prefrontal cortex).

Main Results:

• A statistically significant increase in visual fatigue was observed after the air traffic control task compared to before (P < 0.05).
• Significant differences in hemodynamic responses were found in the left dorsolateral prefrontal cortex (oxygenated and deoxygenated hemoglobin) and right dorsolateral prefrontal cortex (deoxygenated hemoglobin) related to stereoscopic alignment errors (P < 0.05).
• Cortical tissue oxygenation requirements in the left hemisphere suggest a more pronounced effect of visual fatigue.

Conclusions:

• Stereoscopic display alignment errors induce measurable visual fatigue.
• These errors lead to significant changes in prefrontal cortex hemodynamics, particularly in the left hemisphere.
• The findings highlight the left dorsolateral prefrontal cortex's sensitivity to visual fatigue caused by display misalignment.