lecture5_models_of_attention

lecture5_models_of_attention - Outline Selective Attention...

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Outline Selective Attention (General) Selective Attention (Visuo- spatial) Disorders of Attention Automaticity Attention in the real world
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Selection What is missed in our sensory world? How do we choose which aspect of the vast sensory stimuli that we experience deserves further processing? Imaging the following 2 scenarios…
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Results In some cases we can do 2 things at once, but in other cases this becomes an impossible task WHY? Conscious processing versus automaticity
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Questions What happens to the other material in our sensory environment, that is UNATTENDED? Are all stimuli initially processed (and recognized), and then discarded as unimportant? Is the ‘unattended’ information able to influence future thoughts and behaviour?
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Selective Attention Can be thought of as structural limitations to processing Come in several forms: Early selection Attenuation Late selection Bottleneck Theories
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Models of Attention Early selection filter Broadbent, 1958 Assumes attentional filtering occurs prior to pattern recognition stage While paying attention to one source of information, all processing of other stimuli are BLOCKED such that processing never goes beyond the sensory register stage
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Models of Attention Filter Attenuator model Treisman, 1964 SOME of the unattended information also reaches pattern recognition stage We CAN process more than 1 input at a time
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Models of Attention Late-selection model Deutsch & Deutsch, 1963; Norman, 1968 We DO process material that is unattended Past the low level pattern recognition stage, all the way up to higher level processing for meaning and relevance
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Broadbent Attention operates like an ON/OFF switch Attention directs processing to one, and only 1, input channel Attention is ALL or NONE Evidence?
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Cherry, 1953 the shadowing task Recorded 2 different sentences onto tape Subject listened through headphones Sentence 1 played to the right ear Sentence 2 played to the left ear Subjects asked to “SHADOW” (repeat it out loud, as it was heard) the sentence being played to the right ear only Told to IGNORE the sentence in left ear
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Selective Attention Early selection: Broadbent’s filter model Bottleneck Theories Dichotic Listening
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Cherry, 1953 the shadowing task Results supporting Broadbent Can shadow sentence in right ear Could not recall the sentence played to the left ear! BUT, Cherry then varied aspects of the unattended sentence, to see if ANY information about the sentence was getting through PHYSICAL CHARACTERISTICS OF THE sentence WERE DETECTED! Subjects noticed when unattended sentence
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This note was uploaded on 03/19/2010 for the course PSYCH 207 taught by Professor Lodson during the Spring '05 term at Waterloo.

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lecture5_models_of_attention - Outline Selective Attention...

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