perception and sensation notes
perception and sensation notes PSYCH111-06
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This 3 page Class Notes was uploaded by Rayne Wagner on Wednesday December 30, 2015. The Class Notes belongs to PSYCH111-06 at Brigham Young University - Idaho taught by Wiggins, Bradford Jay in Fall 2015. Since its upload, it has received 23 views. For similar materials see General Psychology in Psychlogy at Brigham Young University - Idaho.
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Date Created: 12/30/15
October 2, 2015 General Psychology Introduction to sensation and perception Sensation: data coming in Perception: how we make sense of the data Bottom up processing: - Sensory receptors relay information to the brain - The brain interprets this information Top down processing: - Previous experience and expectations affect the detection and analysis of information from the senses - Explains visual illusions Psychophysics: Methods that measure the strength of a stimulus and the observer’s sensitivity to the stimulus Absolute threshold: minimum stimulus necessary to detect a stimulus half of the time. Difference threshold (just noticeable difference/ JND) Minimal change in a stimulus that can just barely be detected Weber’s law: for a difference to be perceptible, two must stimuli must differ by a constant proportion, rather than amount. Sensory adaption: diminishing sensitivity to an unchanging stimulus Benefit-freedom to focus on informative changes without uninformative background stimulation We perceive the world not as it actually is, but as it is useful for us to perceive it Sensation: the detection of stimuli such as sounds, objects, and smells Vision and hearing Vision: - Transformation light energy The eye Rods - Function in dim light - Detect black and white vision but not colors - Necessary for peripheral and twilight vision Cones - Near center of retina (fovea) - Function in bright or day light - Detect fine detail - Enable color perception Focusing Vision - I people with normal vision, both nearby and faraway objects are focused on the retina at the back of the eye - In nearsighted people, faraway objects are focused in the front of the retina - In farsighted people, close objects are focused behind the retina Feature detection: - Hubel and Wiesel discover feature detector cells in visual cortex (1979) - Feature detector cells pass info onto supercell areas in cortex - Supercell areas recognize biologically relevant objects and specialize in response to a specific stimulus
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