Study of electroencephalography-based objective stereoscopic visual fatigue evaluation

Stereoscopic display technology has attracted much attention owing to its important applications in many aspects of our daily life. Nevertheless, visual fatigue caused by accommodation-vergence conflict affects viewers´ comfort and its evaluation remains a critical issue. A monotonous and repetitive random dot stereogram based experiment is designed to induce visual fatigue and an objective electroencephalography-based evaluation method is proposed in this paper, in which relative energy spectra of 6, a and p frequency bands are computed respectively. Such statistical analysis techniques as paired-t test and analysis of variance are applied to compare features between alert and fatigue stages and the comparison result shows that a activity changes more significantly compared with that of p and G activities. It has also been found in the experimental results that a activity shows stable significant increase with the progress of experiment, especially in the frontal site, which indicates that a wave can be a promising indicator for stereoscopic visual fatigue evaluation.