Some time ago I presented a video illustrating change blindness (see Visual illusions, change blindness and autism). A related effect is inattentiveness, as featured in this short (1:22 min) video:
Then watch this for an explanation:
I prefer the latter video, but they put a spoiler in the beginning, unfortunately.
HT: The Homunculus (for the first video)
Other articles on Code for life:
The inheritance of face recognition, or should you blame your parents if you can’t recognise faces?
Undiluted humour: If Homeopathy Beats Science
Tracking disease and human migration through genetics
Map shows New Zealand with lowest death rate on earth in 1856, over 11 in 1000 dying
Deleting a gene can turn an ovary into a testis in adult mammals
[...] Too much attentiveness leads to inattentiveness [...]