Perception is an active and constructive process We used quick and dirty

Perception is an active and constructive process we

This preview shows page 11 - 13 out of 13 pages.

Perception is an active and constructive process We used quick and dirty estimate of the world This can lead to misinterpretations of the world Visual illusions Change Detection A compelling change detection study demonstrates that our experience of a picture-like visual world may be an illusion. – when you look at the same picture with a slight difference for a few milliseconds, you do not necessarily see the change. - Change blindness - the failure to consciously detect an obvious change in a scene. - Grand illusion of perception -the illusion that what we see in our visual field is a clear and detailed picture of the world - contrary to our subjective experience, we likely process only one or two objects in detail at any given moment. Feature Integration Theory What we perceive is not a faithful and detailed view of the world but an assortment of mostly disconnected features. Feature integration theory (FIT): when we initially view objects in our field of vision we unconsciously extract their features (color, orientation) across the whole scene being viewed through a process called preattentive processing (the unconscious extraction of features that must take place before we can perceive an object). - FIT assumes that for an object to be consciously perceived as a whole object, its features must be ‘’bound’’ together. - This feature binding takes place when attention is applied to the features in a given region of the visual field.
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The Constraints of the Visual SystemA high-fidelity percept of the world is not possible because:
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  • Winter '08
  • LEVITIN

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