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Chapter 4

PSYC 2003H Chapter 4: Chapter 4: Sensation and Perception

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PSYC 2003H
Denise Beike

Chapter 4 Sensation and Perception Sensation and Perception are Distinct Activities Sensation: simple stimulation of sensory organ Perception: organization, identification, and interpretation of a sensation in order to form a mental representation Transduction: many sensors in the body convert physical signals from the environment into encoded neural signals sent to CNS Psychophysics Gustav Feschner (18011887): new approach to measuring sensation and perception Psychophysics: methods that measure the strength of a stimulus and the observers sensitivity to it Measuring Thresholds begin measuring process with a single sensory signal Absolute threshold: the minimal intensity needed to just barely detect a stimulus in 50 of the trials Just noticeable difference (JND): the minimal change in a stimulus that can just barely be detected not a fixed quantity proportion between stimuli is important Webers Law: the JND of a stimulus is a constant proportion despite variations in intensity
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