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Canada (161,966)
Psychology (9,696)
PSYB57H3 (366)
George Cree (102)
Chapter 11

b57 - chapter 11 - VISUAL KNOWLEDGE

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George Cree

B57 Chapter 11 Visual Knowledge VISUAL IMAGERY Introspections about ImagesFrancis Galton asked various ppl to describe their images and to rate them for vividness so he asked them to introspect to look within and report on their own mental contentsThe self report data he obtained fit well w common sense the participants reported that they could inspect their images much as they would inspect a picture This implies a mode of representation that is picture likeAnother founding is that his participants differed widely from eo many described images of photographic clarity rich in detail as if they could see the object whereas others reported very sketchy imagesnone at allConcerns cannot take self reports for face value participants may be seeing similar things but describing them differently Chronometric Studies of ImageryResearchers have been sensitive to concerns of self report from Galtons observations so they dont usually ask participants to describe their image instead to gain more objective data they ask people to do something w their imagesto read info off of them or to manipulate them in some way o Chronometric studies time measuring generally a study that measures the amount of time a task takes often used as a means of examining the tasks components or used as a means of examining which brain events are simultaneous w specific mental events o These studies allow us to ask what sorts of info are prominent in a mental image and what is not ie write a paragraph describing a cat you would mention nose whiskers etcbut you may not include head because that seems to obvious However if you were to draw a cat you would include the head in the sketch but not the paragraphThe pattern of what info is included depends on the mode of presentationPeople have the option of thinking about an image ie a cat via imagery and also the option of thinking about cats wo imagery to think about it without picturing it depending if you are just thinking about it VS picturing it as this mode of representation changes so does the pattern of info availabilityImage scanning procedure an experimental procedure in which participants are asked to form a specific mental image and then are asked to scan with their minds eye from one point of the image to another By timing these scans the experimenter can determine how long travel takes across a mental image Examplein lecture notes too o In an experiment results show that participants scan across their images at a constant rate so that doubling the scanning distance doubles the time required for the scan and tripling the distance triples the time required o Similar results when they are asked to zoom in or zoom out of their imagesresponse times are proportional to the amount of zoon required 1
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