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Chapter 5

Psy100h1 Textbook notes chapter5 part2

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University of Toronto St. George

CHAPTER 5 SENSATION PERCEPTION AND ATTENTIONothis poing has NO rods or codesblind spotooptic nerve splits into two part that cross at OPTIC CHIASMcauses all info from left side of visual space to be projected on right hemisphere of brain vice versa first synapse of majority of ganglion cells in thalamus from there to primary visual cortexvisual sensory neurons tuned to particular types of information in light some respond best to color shape directions of motion gives neuron SPECIFIC receptive field population of sensory receptors that influences activity in a sensory neuron region within which cell responds to given stimuli VISUAL receptive fields located on a specific region of retina or visual space ganglion cells have receptive fields sensitive to edges abrupt changes in brightness or color and insensitive to uniform regions large areas of same color or brightness oRetina filters out uniform because little useful information oCompressed image sent to brain emphasizes bordersEdge detectionadjacent photoreceptors in retina inhibit one another olateral inhibitioneg illusion of round grey dots at intersection of white lines against dark backgroundobject looks lighter against a black background than white one called simultaneous contrastemphasizes changes in visual stimuli imp for finding boundaries of objectsColor of lightdetermined by wavelength 400700 nm but wrong to equate physical wavelength with perceived colorcolor categorized by hue brightness saturationhue distinctive characteristics of color depends on lights wavelength when reaches eyebrightness perceived intensity or luminance of color depends on amount of lightodifferent from lightness A psychological dimension determined by its brightness relative to surroundings obecause of simultaneous contrast two greys with same brightness can different in lightness depending on surrounding levels of brightness olightness more important for visual appearance but not physical propertysaturation purity of color varies according to mixture of wavelengths in stimulus color determined not only just wavelength but MIXTURE of wavelengths SPECTRAL PATTERN in stimulusTWO ways to produce spectral pattern SUBTRACTIVE or ADDITIVE mixture oSubtractive color mixing mixture occurs within stimulus itself physical not psychological Eg mixing paints Occurs because color determined by pigments Red yellow blue are the subtractive primary colors Get black if mix all 3 additive color mixing what you see is determined by interaction of wavelengths with receptors in eye PSYCHOLOGICAL processthree primaries law of color any color can be created by combining 3 wavelengths one from longwave red one from middle greenyellow one from short bluevioletoexact colors are ARBITRARY oadditive primary colors Red green blue Get WHITE light if mix oPrism rainbow because different wavelengths refract at different anglesColor visionstarts in cone cells transducer light into neural impulses oTHREE types of cones SblueMgreenLred oColor of stimulus determined by how much of each type of cone activated ratiooEg YELLOW light stimulates M and L hardly Ssome colors seem to be opposites red and green blue and yellowdue to retinal ganglion cells osome excited by L cones but inhibited by M cones red and green are opposites
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