Post on 17-Dec-2015
Change blindness
examples are from:
http://viscog.beckman.uiuc.edu/djs_lab/demos.html
Spot the change in the following images
Change blindness
• While a door is carried between an observer and one person, that person is replaced by a 2nd person. 50% of observers do not notice changes in identity
(Simons & Levin, 1998)
• Observers must attend to features to notice change
• Attention does not ensure memory of all features
Change blindness
• Subjects miss large changes during saccades (e.g. exchange of heads, Grimes 1996)
• Change is noticed by the motion between the original and new form of an item
• We miss change if it happens slowly or if an irrelevant transient (e.g. flash, occlusion, saccade) occurs between the original & new forms
Seeing Depends on Attention
• Inattention blindness events not seen
• Attention control problems (neglect) can mean that part of the world is selectively ignored
• Note hemi-spatial neglect from previous lecture (6)