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PSY100H1 Lecture Notes - Dioscorea Alata, Aqueous Humour, Radio Wave

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Michael Inzlicht

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-sensation is the stimulation of sense organs
-preception is the selection, organization and interpretation of sensory input
-sensory receptors are tuned to a particular form of energy
-auditory receptors in the ear code for sound pressure changes, not for light
-sensory systems require a minimum amount of energy of activation (absolute threshold)
-Just-noticeable difference (JND): the minimum difference in stimulation that is just
-Weber noted that the JND is a fraction of the original stimulus intensity; the fraction
is different from different sense
The Visual System
-the eye detects electromagnetic radiation (light)
-vision is functional
-allows for detection of movement (predator or prey?)
-allows for detection of colour (ripe or spoiled?)
-light detection is useful because
-light travels rapidly (no delay, unlike hearing)
-light travels in a straight line (no distortion)
-light interacts with the surface of objects in the environment (reflected or absorbed)
Transduction of Light
-light travels through the retina to impinge on photoreceptors at the back of the eye
-light bleaches a pigment contained within the photoreceptors
-bleaching leads to a graded receptor potential that eventually produces an action
potential in the ganglion cell
-two types of photoreceptors
1. cones: found in the center of retina (fovea) and are sensitive to fine details and
2. rods: found in periphery of retina and are sensitive to movement but not fine detail
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Details of the Human Eye
Electromagnetic Spectrum
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