Biological Psychology

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

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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

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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)