PSYS 100 Lecture Notes - Lecture 6: Cellular Respiration, Opponent Process, Sound
5 Oct 2016
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September 13, 2016: sensation and perception, sensation. An immense amount of physical energy, in many different forms, is present all around us all the time. How does physical energy from the environment get translated into a form the brain can use: vision. B. 1. a) each retina contains many millions of neurons known as rods and. Rods: are sensitive to low levels of stimulation. The fovea (at the center of the retina) is all cones. Thus, color is perceived better in the center of the visual field, weak stimuli better towards the periphery. Electromagnetic (light) energy catalyzes a chemical reaction within a rod or cone cell energy released stimulates the cell to fire. A refractory period is required before sensitivity is restored. Different wavelengths are perceived as different hues (colors): shorter= violet/blue; longer= orange/red. All discriminable hues can be produced by one blend or another of just 3 basic colors: blue, green, and red.
