Change blindness is an issue of
attention and representation. If we fail to represent an object in a scene
either before or after a change, then we won’t notice the change, and we tend
not to represent objects that aren’t important to the meaning of what we’re
looking at, because we’re just not paying attention to them.
Simons and Levin conducted an experiment
in which the two experimenters who acted as direction-takers were dressed as
construction workers, who are common on college campuses, and generally ignored
by students and faculty alike. The rest of the procedure was the same (ask
directions, guys with door walk in between them, experimenters switch, and so
on). This time, only 4 of 12 young participants (college age) noticed the
switch, supporting the hypothesis that people only notice the change when the appearance
of the individuals was relevant.
http://link.springer.com/article/10.3758%2FBF03208840
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