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Lecture 12

PSYC 2390 Lecture Notes - Lecture 12: Pointillism, Georges Seurat, Tetrachromacy


Department
Psychology
Course Code
PSYC 2390
Professor
Lana Trick
Lecture
12

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Thurs,Feb25th,2016
Lecture12:ColourVision(Chapter9)
Reviewfromlasttime
TemporalPathway
ParietalPathway
● damagecancausehemispatialneglect(aboutwhereweleftofflasttime)
○ notactuallyblindtotheinformation,theyjustcan’tpayattentiontoit.Likethey’ll
drawanimage(likeaflower)butit’smissinghalfitsside
○ someevidencethey’repayingattentionbutnotawareofit,giventwopicturesof
houses,oneonfireonthesidethey’reneglecting,they’llsaythey’reidenticalin
everyway,andwhenaskedwhathousethey’dratherliveinthey’dalways
choosetheonewithoutthefire.Soonsomelevel,theinformationisgettingin.
Dissociationsbetweenpathways
● damagetoonewon’tcauseproblemstotheother
● thingslikethemotorsystemwillstillgetinformation,butthecognitivesystemdoesnot.
ColourVision(Chapter9)
Whatiscolour?
● wavelengthistheaspectmostcloselyrelatedtocolour
○ spectrumofvisiblelight,350nm750nm
○ purecolour,othercolourslikepurpleandbrownarearesultofmixtures
● Chromaticcolour
○ fromthespectrum
● Achromaticcolour
○ grey,black,white
○ whiteisequalamountsofallofthem
○ greyisallthetypesoflight,butnotasmuchwavelengthisreachingyoureye
○ blackisevenlesswavelengths,allequally
● Hue
○ mostcloselyrelatedtothewavelength(wavelengthchroma)
● Brightness
○ theamplitudeofthewavelength
○ thehigher/largertheamplitudethebrighterthecolour
● Saturation
○ purityofthelight/colour
○ puresaturatedcolour:monochromaticlight(monochromaticmeaningone
wavelength)
○ desaturatedcolour:notpure,madeupofamixtureofwavelengths
● Colourcomesfromtwodifferentsources
○ pigmentandlightsource
Newton’sinsight
● realizedthatwhitelightisacombinationofdifferentwavelengths
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