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Lecture 3

PSYC 211 Lecture 3: PSYC 211 NEURO NOTES OCT 3

3 Pages

Course Code
PSYC 211
Gary Brouhard

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Vision: Photons act like a wave and a particle Amount of energy is inversely proportional to the photons wavelength Photons do all the wavelengths on the electromagnetic spectrum, but were only gonna talk about the Visible Light part. Photon in this section breaks the covalent bond in opsin which causes the depolarization of the neuron (by use of a signal cascade) Opsins are the proteins in our sensory receptors (NEURONS) Four kinds: rod opsin (rhodopsin) and 3 cones (blue, green or red) Each neuron only detects one wavelength of light because each neuron has one opsin Rod doesnt interpret the colourwavelength of light, just the amount of it. The three colour sensors (cones) manage to convey all the colours of the visual spectrum Each cone has an optimal wavelength! Ex: green cone is 535nm, but it is 13 activated at 610nm. Each cone also has a different sensitivity to light (relative activity among the three cones dictates the colour that the brain perceives) A lot of modern TVs have 3 LEDs at each pixel (red green and blue), if activated and at a far distance, look white! Properties of light: o Red + Green = yellow o Red + blue = purple o White: all colours are being reflected o Light is additive, paint is subtractive o Green light means you DONT have red and blue (they have been absorbed not reflected), otherwise youd have white light o When you paint, you are subtracting colours from the whiteness. Paint doesnt create light, just absorbs and reflects light. o Magenta paint is just subtracting green (means you have red and blue light) o With paint, you try to subtract a single colour at a time so that it takes lonegr to create black (once youve subtracted all the colours) o Red paint: ALREADY SUBTRACTED TWO COLOURS (and cyan! Cuz its the combo of blue and green) o Green, blue and red = used in TVs. Paint is magenta, yellow and cyan. o Black = absence of light. 100 brightness = pure light o Brightness = playing with just white and black o Saturation (purity)= how much you deviate from center point in the colour wheel (very close to white or very close to your colour) Eye conditions: o Protonopia: cone is defective because gene that makes protein is defective (ex: red cones are filled with green cone opsin) o Deuteronopia: green cones filled with red opsin o Achromatopsia = see in black and white
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