Why you sometimes miss obvious things: inattentional blindness
Note: Strictly speaking, the example I give at the end of this video would be classified as "change blindness" rather than inattentional blindness. However, there is quite a lot of overlap between these two concepts, i.e. they are both failures of visual awareness and involve not noticing things that seem very obvious in retrospect. The latter was just easier to demonstrate quickly for the purposes of this brief video.
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References:
Simons, Daniel J., and Christopher F. Chabris. "Gorillas in our midst: Sustained inattentional blindness for dynamic events." Perception (28)9 (1999): 1059-1074.
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