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class+21+lecture+_last+of+attention+and+taste_ - Sensation...

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Sensation and Perception Class XXI: Attention & Taste
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Perceiving and Understanding Scenes Change blindness : The failure to notice a change between two scenes If the change does not alter the gist, or meaning, of the scene, quite large changes can pass unnoticed Demonstrates that we don’t encode and remember as much of the world as we might think we do
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Figure 8.27 There are four differences between these two images. Can you find them?
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Figure 8.28 The locations of the differences between the two images in Figure 8.27
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Perceiving and Understanding Scenes Local and global approaches to scene recognition Local approach : Identify the individual objects in a scene and use the identities of the objects to determine what the scene is Global approach : Identify the entire scene all at once, without identifying individual objects within it
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Perceiving and Understanding Scenes Local approach to scene recognition: Scene recognition can happen very quickly How might we quickly identify objects in a scene without having to look at each one? § Covert attentional shift : A shift of attention in the absence of corresponding movement of the eyes
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Perceiving and Understanding Scenes Global approach to scene recognition Perhaps it is not necessary to recognize individual objects in order to recognize a scene Spatial layout : The description of the structure of a scene without reference to the identity of specific objects in the scene § Open, enclosed, rough, smooth, natural, artificial, etc.
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Figure 8.30 A simple visual “scene” composed of two sinusoidal gratings
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Figure 8.31 Spatial layout from global information
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TASTE
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Taste versus Flavor Retronasal olfactory sensation : The sensation of an odor that is perceived when chewing and swallowing force an odorant in the mouth up behind the palate into the nose Such odor sensations are perceived as originating from the mouth, even though the actual contact of
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