Lecture Date: 02 - 24 - 16 Wed
Lecture Date: 02 - 24 - 16 Wed PSYCH 2014
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This 0 page Class Notes was uploaded by Somto Onwuchekwa on Wednesday February 24, 2016. The Class Notes belongs to PSYCH 2014 at George Washington University taught by Steven Mitroff in Spring 2016. Since its upload, it has received 13 views. For similar materials see Cognitive Psychology in Psychlogy at George Washington University.
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Date Created: 02/24/16
02124116 Lecture How information ows through the brain Stimulusl Sensory registrationl Semantic processing l Response When does attention lter out unwanted information 0 Early Before semantic processing 0 Does the lter happen during stage 2 sensory registration 0 Before you ve reached anything that has to do with meaning 0 Late After semantic processing 0 Or is it happening at semantic processing the meaning Early Before semantic processing 0 During sensory registration 0 Only process some sensory info Quickly attend to something and block out the rest 0 Ex Dichotic Listening Task Used in the 50 s You put on headphones Info can be said to either left or right You re told to repeat words wordfor word from one ear and ignore the other Dichotic listening 2 sounds one to one ear one to the other Ignore one stream attend to the other stream What can breakthrough from that ignored stream They noticed the unattended when n Noticed if the unattended became a pure tone I If it switched from male to female In Or if it was the same word repeated 35 times a Sensory Info is passing through that39s why they noticed They did not notice if n The unattended changed languages I If it was the sound played backwards 0 Why Although gibberish it still had the same tone I No semantic information is passing through that39s why they didn39t notice 0 Ex Brain activity Letters are going and you re told to look and focus on one When the target appeared in the stream you re attending to you pay attention to it When the target appeared in the stream you re not attending to you don t pay attention The ltering is happening early on Measured through EEG Brain waves based on Attention as early as 100ms One problem for Early selection 0 You can be at a party and hear someone say your name or something that pertains to you 0 Your name grabs your attn If its early selection your name shouldn t go through because it has semantics and meaning so it shouldn t pass the sensory info 0 Some information can break through eg Your name FIRE o This shows that you do have information that moves your attn around Sensory info is the color Semantics is the word 0 That s why its is hard to read BLUE RED ORANGE GREEN YELLOW We look at the color but get affected by the meaning so it is hard Early and Late selection 0 There is evidence for both 0 Its not just early its not just late 0 They can be moved around 0 quotAttention Loadquot Late 0 After semantic processing 0 Process all sensory info 0 Don t attend to anything right away Simble Feature Search 0 In class demonstration O 0 Find the Green Scarf in the midst of red ones Vs Find the Bald guy Why was the bald guy more difficult There was less color variation Feature integration Theory 0 When you see a stimulus displayed you have feature maps in your head 0 There are different feature maps in your head 0 Feature maps for size color shape orientation When things are displayed you know it quotPre attentive Basic Features processed in parallel with feature maps What does that mean Pre attentive Before selection You don t use your limited resources here They happen without effort a If you see blue your blue feature map is activated a If you see yellow your yellow feature map is activated a If you don t see red red feature map is not activated Basic features Things that are core elements of perceptual features a Size color Parallel They re all happening at once a You see blue horizontal lines 0 Blue feature map horizontal feature map and lines shape feature maps are all working at once 0 Attention This links all the feature maps together into a single object to know the blue horizontal lines are one object 0 Visual Stimulus Feature Maps Master Map of locations In class demo o Is red present in the midst of blue o Is red present Yes Feature map working not difficult ls RED VERTICAL present in the midst of red verticals red horizontals and blue horizontals 0 when you have to bind feature maps together bind the red color and determine if its red vertical or red horizontal it takes longer What are the Units of Attention Posner 1980 0 Selecting regions of space regardless of objects 0 Your eyes are constantly moving Secads Moving your eyes Fixation xate on one thing and stop moving your eyes 0 The idea is that you can get people to move their attn in space 0 Exogenous External cue Can be automatic Loud noise Loud bang Makes you look Blinking lights The Posner trial a The small black square randomly popping up in either the LEFT square or the RIGHT square 0 Endogenous You read the sentence and then you attend to the info Internal commitment Not automatic You decide if you want to move your attn You see words telling you to look LEFT or RIGHT then you move your attn to the box it is telling you and the small black square appears Object based attn Faster and more accurate processing within ONE object than across TWO objects Experiment 0 You have two rectangle blocks 0 The cues pop up black dot then the object pops up Red circle Valid Cue refers to the black dot and red circle Same object same object refers to the same block 0 80 of the time o Fastest Invalid Cue Same object o Slower Invalid Diff Object o Slowest
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