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[PSYB51] Lecture notes 5 (Ch.5)

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University of Toronto Scarborough
Matthias Niemeier

Lecture 5: Perception of colour and motion #1: Short answer question Describe one experiment that would suggest that faces aren’t special. What were participants asked to do? Which method was used? What was found? What does that potentially mean? -Fusiform area, experiment using gribo (neo-object) hence no practice effect -Using entire family gribos #2: Detect colors through retina using 3 different tones #3: -Trichromacy: Mechanism which 3 detectors for many colours -Opponent processes: different processes in different colour #5 -Colour: Not physical property, but psychophysical property -Light that reflected from surfaces #6: -Images are similar to sandwiches, one layer of blue, green and red -Cones are functions similarly to filters, specialized for 3 different types of wavelengths -filters alone cannot tell what colour you are look at, cannot tell what is green or not #7: Univariance: Only rate of action potential is telling information of stimulus -one kind of filters(photoreceptor) do not help much, cannot tell discrimination -Any colour can produces same output #8 -Each cones response to different certain wavelength, result as a curve of graph -e.g. some cone responses greatest to green, and yellow the second -2 colour (blue and orange) result same # of output, #9: S cones: Short cones M-cones: Middle cones L-cones: Long cones #10: Scotopic: refer to dark light, using rod cells, no able to discriminate colours -Rods only have one type of photopigments, also peak at green colour (M-cones) #11: Newton: White light is actually consist a range of different colours Young Helmholtz theory: -State there’re must be 3 mechanisms in sensing colour -Always able to create similar bluish light that from single wavelength -Using 3 different wavelengths together -using blue, green and red colour at the same time -Look the same, but different physical property according to Newton #12: -S-cone: Refer as blue cones (Peaks at blue for greatest responses) -Shorter range of wavelength for creating responses -Not responses to many wavelength -M-cones is referred as green cones (Peaks at green for greatest responses) -L-cones: is referred as red cones #14: -More even the curves, more close to perceive black and white (grey colour) #15: -Metamers: cannot perceive, -Mixing green and red will look like yellow to us, M and L cones receives same # of responses -not able to distinguish as different colour, but perceive as yellow #16 Metamers: can apply in another form of senses -in any cases where cannot distinguish and tell the difference, information is lost #17: Mixing light and paint together: can be additive or subtractive -Mixing colour light together: Additive mixture, become brighter, more energy -Mixing paint together: Subtractive mixture, result dimmer and darker colour -Take out light, may result of black colour -Result as white colour when blue and yellow light shines together in balance wavelength -We do not have blue cones, hence looks more blur and darker than other colours -less specialized, only have green, red and yellow cones #19: -Pigment have properties to filter other different colours ranges of light #20: -3 different types of dimensions can create any kinds of colours -Hue: different types of pure colours -Saturation: strength of a hue, faint or richness of colour -Brightness: distance from black in colour space, dark of brightness of colour #21: -Magenta: not a spectral hue, cannot get this colour from sunlight -not a pure colour, mix of blue and orange -M cones response differently -Not possible without simulating M cone when S cone and L cones stimulated at the same time -Magenta (Blue and orange) respond as green colour (between blue and orange wavelength) -Since M cones is specialized for wavelength between S cone and L cones #23: -Hering: System which is known as the Opponent colour theory -Based on obser
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