Mental Imagery (student Spr08)

Mental Imagery (student Spr08) - MENTAL IMAGERY Is visual...

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MENTAL IMAGERY Is visual information stored in a visual or propositional (language-like code)?? If visual, it should maintain spatial and perceptual characteristics of pictures (including the ability to re- interpret an image). If more descriptional, then only information & characteristics that one had originally encoded should be evident (including one’s first interpretation). [Reisberg refers to depiction vs. description ] ways to study imagery: a-introspection (“looking inward”) b-chronometric Studies I. Quasi-Picture Theory (Shepard, Kosslyn, Finke) 1. mental images are Analog/ Geometric representations of visual stimuli; and are “functional isomorphs” to Euclidean space (Shepard) 2. visual imaging is functionally equivalent to seeing, with our “mind’s eye” b. Theoretical Claims ( Finke’s Principles*) 1. Spatial Equivalence* : represent like pictures (not like sentences). Location, size, and distance are arranged in an image as they are in physical space. a. spatial relations among objects in an array are preserved 2. Implicit Encoding* : spatial relations can be implicitly represented in a picture/ image (without explicit attention ever having been paid to the spatial relations). 3. Perceptual Equivalence* : imaging is like seeing (with a “mind’s eye”); the same ‘visual screen’ is used a. E.g., Perky’s (1910) tomato/leaf/banana experiment b. --the parts of visual images can be processed in parallel (whereas sentence elements are processed serially) 4. Transformational Equivalence* : a. images can be scanned, rotated, etc. in the same way as actual pictures or spatial stimuli b. E.g., “mentally” walking around one’s house
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c. Eye movement patterns are the same when people image an object as when they perceive that object (Laeng & Teodorescu, 2002) 5. Structural Equivalence* : the structure of Images is like that of actual perceived objects, and can be re-organized & re- interpreted. Images are analogous to 2-1/2 D sketches.
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