1. Change blindness examples are from: http://viscog.beckman.uiuc.edu/djs_lab/demos.html Spot the change in the following images

5. 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

6. 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

7. 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)