The phenomenon in which observers do not notice an unexpected object appearing in a visual display is termed:

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Inattentional blindness refers to the failure to notice a fully-visible, but unexpected object or event when attention is focused elsewhere. This can occur in situations where attention is limited or distracted. Change blindness, on the other hand, refers to the difficulty in detecting changes between two similar visual scenes. The Ebbinghaus and Müller-Lyer illusions are both examples of perceptual illusions that affect the perception of size or distance. The Ponzo illusion is another example of a perceptual illusion that affects the perception of size and distance.

The Phenomenon in Which Observers Do Not Notice an Unexpected