  Change blindness is a phenomenon where an individual fails to notice
alterations in a visual scene when a change occurs during a brief interruption
or distraction. Understanding this phenomenon is specifically important for the
technique that uses a visual stimulus, such as Virtual Reality (VR) or
Augmented Reality (AR). Previous research had primarily focused on 2D
environments or conducted limited controlled experiments in 3D immersive
environments. In this paper, we design and conduct two formal user experiments
to investigate the effects of different visual attention-disrupting conditions
(Flickering and Head-Turning) and object alternative conditions (Removal, Color
Alteration, and Size Alteration) on change blindness detection in VR and AR
environments. Our results reveal that participants detected changes more
quickly and had a higher detection rate with Flickering compared to
Head-Turning. Furthermore, they spent less time detecting changes when an
object disappeared compared to changes in color or size. Additionally, we
provide a comparison of the results between VR and AR environments.
