Sensation and Perception 10/12
Sensation and Perception 10/12 PSY 101
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This 5 page Class Notes was uploaded by Nowak Notetaker on Sunday October 18, 2015. The Class Notes belongs to PSY 101 at Indiana University taught by Dr. Thomassen in Summer 2015. Since its upload, it has received 17 views. For similar materials see Introductory Psychology in Psychlogy at Indiana University.
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Date Created: 10/18/15
MKNOWAK 10121016 Sensation and Perception Sensation translating messages stim from environment Sensory neurons first Perception producing stable interpretations of translated messages then Stim gt sensation physical gtperception higher order psychological part gt response Sensation building blocks of experience data driven real info bottomup processing 0 physical translating the message Perception experience of stim events conceptually driven from mind topdown processing organizing data mentally psychological producing stable interpretations Optical Illusions show the difference btwn sensation and perception sensory info has not changes perception changes we see in 2D and perceive in 3D depth perception Hollow Mask Illusion ignore monocular depth cues of shading shadows overridden by topdown processing expectations of reality MKNOWAK Schools Structuralism Wundt Fechner Weber experiences from basic senses SENSATION Gestaltists form organize principals of Visual PERCEPTION fundamental and innate how we experience as whole rather than pieces Sensation afferent Axn potentials respond to stim Sight Vision electromagnetic energy wavelengths of light Sound hearing physical sound waves thru air Touch physical pressure on receptors Smell chemical molecules in air or liquid Taste chemical molecules on tongue receptors MKNOWAK Transduction going from physical world stim to the language of the mind neural impulses allows brain to manipulate enviro data ex photoreceptors detect light but eye and brain detect image Transduction occurs w in photoreceptors create neural impulses 400nm700nm visual colors shortvioletblue mediumyellowgreen longred Rods about 120 milleye sensitive to low light mvmnt outer eye peripheral Cones about 6 milleye sensitive to fine detail visual acuity color densely packed in center fovea Dark Adaption Photopigments in photoreceptors chemically react to light break down in bright regenerate after low light adaption Processing in Retina ganglion cells tuned respond to specific trigger brightness contrastlateral field receptive fields across retina magicians and pick pocketers Visual Cortex neurons pick up and process features damage prosopagnosia failure of face recognition MKNOWAK Color Vision Trichromatic Theory 3 types of cones blue red green colors sensed comparing activation of colors most are a mix of the colors wrong kind of photopigment in cones certain color blandness Opponent Processes receptors respond positive to one color and negative to complementary color yellow blue red green black white Stable Interpretations inborn tendencies bottomup physical messages topdown belief of expectations 5 laws of visual organization Gestalt Proximity closeness processed as unit similarity topdown similar associated Good Continuity continuation of lines Closure topdown closed figures favored over open Common Fate moving in same direction group together Depth Cues MKNOWAK Monocular depth cues require input from one eye anything used in drawing 3D object Binocular depth cues require 2 eyes Retinal Disparity diff btwn location of images in each retina Convergence how far eyes turn inward to focus on object Phi Phenomenon Apparent motion Assume motion wo actual movement Movies ipbooks Perceptual Constancy Perception of objects far more constant or stable than our retinal images topdown sensory messages unstable size constancy ex someone walking away Shape constancy ex door closing Sound Sound is mechanical energy vibrating stim speed of vibrations Frequency various pitches Intensity of vibrations Amp volumes MKNOWAK