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| Question | Answer |
| what is colour goof for? | scene segmentation camouflage perceptual organisation good evolutionary force |
| what is scene segmentation | how variations in colour often signal objects' boundaries |
| what are some examples of the ways colour can be a good evolutionary force | can help us detect ripe fruits, harmful or harmless berries, correct leaves to eat, poisonous venomous berries helps us with deciding what's edible |
| what is colour | the different hues we are able to perceive from the narrow band of visible light & its frequencies of wavelengths within it |
| what spectrum is light a part of? | electromagnetic spectrum |
| what are the units of visible light? | 3.9 x 10^-6 to 7.5 x 10^-6 so basically just remember 3.9 & 7.5 and -6 as a power |
| do objects poses colour? | no, the colour is reflected off of the object |
| what is the colour of an object dependent on? | the light source |
| what are the 3 parts to colour? | hue, intensity & saturation |
| what is perceived colour dependent on? | intensity of reflected light + saturation of colour |
| what are intensity & saturation? | intensity = how bright the light is saturation = how much white light is mixed in pure hue |
| what are the psychological attributes for these properties of light? wavelength, intensity & spectral purity | wavelength = hue, colour intensity = brightness spectral purity = saturation |
| what is the difference between pink & red? | the saturation -- white light mixed with pure hue |
| difference between dark blue and light blue? usually | intensity -- the brightness |
| difference between blue & red? | hue |
| what are the 2 theories of colour perception? | trichromatic theory & opponent process theory |
| who was trichromatic theory proposed by? | helmholtz (also proposed the outflow theory for ears) |
| what are the 3 types of receptors for colur & their properties for what they respond to best | short, medium & long cones short = blue pigment (419nm) medium = green pigments (531nm) long = reds pigments (558nm) |
| what happens when a wavelength hits these cone photoreceptors | the pigment is responds best to is bleached & results in permeability changes = action potential |
| is the signal that is sent to the brain coloured? | nope.. our brain interprets the electrical signal |
| what does the trichromatic theory say? | there are 3 different types of cone photoreceptors that are best at responding to different wavelengths of visible light the colour we see is determined by the level of activity in these 3 |
| what is some support for the trichromatic theory? | 3 diff types of dichromatism (colour blindness) and when mixing the 3 colours, we're able to produce all the possible colours of light |
| who was opponent process theory suggested by? | hering & hurvich-jameson |
| what does this theory suggest? | when you're looking at one part of the visual field, u have an opponent process - in which are 3: red-green, yellow-blue, black-white |
| what does this suggest about the receptors? | a red-green receptor will only see red or green, nothing else |
| which of these theorie s are true? | both -- after learning about anatomy of the eye |
| what is the support for the opponent process theory? | nonexistence of a certain colour - like bluish-yellow confusion with colourblindness types like a problem with red = also for green, suggesting linkage afterimages effect where staring at blue = see some yellow + colour context effect |
| whats the colour context effect? | where the visual input is the same but because the context is different, the colour is perceived differently |
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