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Lecture 9

PSYC 2390 Lecture Notes - Lecture 9: Hemianopsia, Scotoma


Department
Psychology
Course Code
PSYC 2390
Professor
Lana Trick
Lecture
9

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Feb9th,2016
Lecture9:NeuralCoding:FromtheEyetotheBrain,Chapter3(Continued)
Backgroundconcepts(continued)
ganglioncells 
 magnocell(Mcell)
 transientresponse
 nocolour
 Parvocell(Pcell)
 sustainedresponse
 finedetailandcolour
 retinotopicimage(diagramoncourselink)
 spatialrelationsonretinaarepreservedinthebrain,thingssidebysideinthe
worldarealsosidebysideinthebrain,onlyflipped.Soleftvisualfieldisright
sideofbrain,viceversa.
 youstillseepartsoftherightvisualfieldwithlefteyeandviceversa,isn’tcutinhalf
downthemiddle.
 distributedcodingvs.specificitycoding
 coding:howdoesthebrainsignalinformation
 specificitycoding
 codinglineorientation,ex.verticalline.Youcanhaveacellthatonly
is
stimulatedwhenthereisaverticalline.
 atypeofcellthatonlyrespondstoonetypeofstimulus
 doesn’tseemlikethebrainworksthisway,atleastintheearlystages,
with1cellfor1attribute.
 distributedcoding
 lookingatthepatternofactivityacrossalotofcells,asopposedtoone
cellinspecificitycoding.
 cellwillrespondtoacertainextenttoeverything,butbetter(moreaction
potentialspersecond)tosomestimulithanothers
 factorsinthedimnessofthelightaswell,#APgoesupinbrightlight,
downinlowlight,evenlowerwhennotquitetherightorientation(ie.
diagonalvs.vertical)
 earlystagesofthebrainrelyondistributedcoding,lateronmoretospecificity
coding
 ex.tiltaftereffect
 youlookatsomething,andthere’saconsequenceonwhatyoulookat
next.
 showpeoplediagonallines,thenshowthemverticallines,andtheystart
seeingtheverticallinestiltinthedirectiontheywereadaptingto.
 soyousawlinestiltedtotheleft,thentheverticaloneswouldstart
movingtowardstheright
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