PSYCH 1XX3 Lecture Notes - Lecture 7: Retinal Pigment Epithelium, Depth Perception, Occipital Lobe
28 Feb 2017
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(cid:449)e (cid:862)see(cid:863) (cid:449)ith our (cid:271)rai(cid:374), the eyes (cid:272)olle(cid:272)t the (cid:448)isual sti(cid:373)ulus. Light travels as a wave and varies in amplitude and wavelength. Variations in amplitude affect the perception of brightness. The greater the amplitude of the light wave, the more light is being reflected or emitted by that object, so the object appears brighter or more intense to use. Variations in wavelength affect the perception of colour. Measured in nanometers (millionths of a millimeter) Smaller wavelengths refer to light with higher frequency, larger wavelengths refer to light with lower frequency. Shorted wavelength we see is 360nm (violet) and longest is 750nm (red) Visible spectrum is from the human perspective. Some insects, like bees, can see wavelengths shorter than 360nm in the ultraviolet spectrum and perceive differences in flowers. Some animals, like snakes, can see wavelengths longer than 750nm in the infrared spectrum to allow them to find prey in the dark by seeing body heat emitted from the prey.
