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Canada (161,798)
Psychology (9,695)
PSYB51H3 (306)
Chapter 8

chapter 8

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Matthias Niemeier

PSYB51CHAPTER 8 ATTENTION AND SCENE PERCEPTIONPage 1Introduction Attention Selective attention any of the very large set of selective processes in the brain To deal with the impossibility of handling all The form of attention involved when processing inputs at once the nervous system has evolved mechanisms that are able to restrict processing to a subset of is restricted to a subset of the possible stimuli things places ideas or moments in timeOvert attention refers to directing a sense organ at a stimulusfixating the eyes on a single word Covert attention directing attention to a person off to the left Divided attention reading text whilst listening to music Sustained attention watching the pot to note the moment the water begins to boil Selection in Space subsequent stimulus will be Cues can be valid Reaction time RT Stimulus onset asynchrony SOA A measure of the time from the onset of a correct info invalid incorrect or neutral The time bw the onset of one stimulus and the stimulus to a response informative onset of anotherThe time it takes for a cue to redirect ourAs the SOA increases to about 150 ms the Cue attention depends on the nature of the cue magnitude of the cueing effect from a valid A stimulus that might indicate where or what a peripheral cue increases The Spotlight of Attention Attention is not moving from point to point the way a physical spotlight would move Visual Search Visual search Distractor Set size Looking for a target in a display containing In visual search any stimulus other than the The number of items in a visual display distracting elements targetLarger set sizemore difficult to find Target The goal of a visual search Feature Searchers Are Efficient Feature search Salience Parallel Search for a target defined by a single attribute The vividness of a stimulus relative to its In visual attention referring to the processing of such as a salient color or orientation neighbours multiple stimuli at the same timeWe can process the color or orientation of all the items at once in parallel Many Searches Are Inef
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