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Psychology (9,695)
PSYB51H3 (306)
Chapter 8

Chapter 8 - Study notes

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Matthias Niemeier

Quiz: wat is the univariance problem in color perception? u have a photoreceptor that contribute to colour sensing but it doesnt see colour ..cuz itz ambiguous, dont noe which wavelength it is. Come combo of wavelength and light energy can contribute to same photoreceptor. How does our colour system solved the problem. by having more than one photoreceptor.. ie red, green, blue. Only combo can tell us wat color we look at What is a horopter? 2 eyes that have 2 diff image.. 2 version.. double vision, unless u focus on smt. If u converge on it, the fovea not have double image, that is one point of the horopter, but there are many points in space where eye dont have double vision. Like a cylinder area where we dont have double vision = horopter 3)SOA stands for stimulus Onset asynchrony 10) we cant move our eyes wo shifting in that direction CH8 ATTENTION AND SCENE PERCEPTION Attention = attention is the name we give to a family of mechanisms that restrict processing in various ways. Overt vs covert attention: overt refers to directing a sense organ at a stimulus fixating the eyes on a single word for ex. If you point your eyes at this page, while directing attention to a person to left, you are engaging in covert attention. Reading this text while listening to music is divided attention. Watching the pot for water to boil is sustained attention. Selective attention = ability to pick one or few out of many stimuli. One can be involved in more than one type of attention. SELECTION IN SPACE Experiment where subjects are fixated on a point and when the test probe appears they are to react. Reaction time (RT) = amount of time that elapses b point when the probe appears and pt when subject hits response key. cue = stimulus that might indicate where or wat a subsequent stimulus will be. Cues can be valid, invalid, or neutral. Cues could be symbolic (voluntary) or peripheral (stimulus-driven) leds to IOR, inhibition of return cuz then valid cue be SOA = 0 How long does it take for a cue to redirect our attention? Symbolic cues direct attention more slowly cuz we have to process the cue. But some symbolic cues ie watching another persons eyes can behave like fast peripheral cues. SOA = Stimulus onset asynchrony = time b onset of one stimulus and the onset of another. We can measure timing of attention shift by varying the interval b when cue appears and when test probe appears. If SOA is 0ms then cue and probe appear at same time, for this there is no diff between the effects of valid or invalid cue. SPOTLIGHT OF ATTENTION www.notesolution.com
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