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Chapter 5

Chapter 5 - Sensation

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Department
Psychology
Course
PSYA01H3
Professor
Steve Joordens
Semester
Winter

Description
Chapter 5 Sensation Sensory Processing - Sensation: The detection of simple properties of stimuli (i.e. brightness, colour, warmth, sweetness) while perception: Detection of objects, their location, movements and backgrounds (i.e. red is SENSATION, seeing a red apple is PERCEPTION) - Transduction leading across: The conversion of physical stimuli into changes in activity of receptor cells of sensory organs - transduction is DIVERSE, in most sense senses, specialized neurons called RECEPTOR CELLS release chemicals that stimulate neurons which is sent to axon - Sensory Coding: Coding system of symbolssignals representing information - Anatomical Coding: Way by which nervous system represents information; different features are coded by the activity of different neurons - Since early 1800s, Johannes Muller formulated doctrine of specific nerve energies learning in whats happening through the activity of specific area of the brain - Temporal Coding: Way by which nervous system represents information; different features are coded by PATTERN of activity of neurons simplest form is RATE - Psychophysics (physics of the mind): Study of measuring quantitative relation between physical stimuli and perceptual experience - Principle of Just-Noticeable Difference: Ernst Weber (1795-1878): Anatomist and physiologist investigated humans ability to discriminate between various stimuli (just noticeable-difference - smallest change in magnitude of stimulus someone can detect) ratio of brightness of light is 1:40 (WEBER FRACTIONS) - Gustav Fechner (1801-1887): Used Webers idea to measure peoples sensations (jnd was the unit of sensory experience) - Signal Detection Theory: Mathematical theory for detecting stimuli - discriminating signal from noise which takes into account participants willingness to report signal detection - EVERY STIMULUS EVENT REQUIRES DISCRIMINATION BETWEEN SIGNAL AND NOISE - Methods rely on a THRESHOLD (Point where the stimulus or the change in the stimulus is DETECTED), difference threshold= Just-noticeable difference (jnd)) - Absolute Threshold: Minimum value of stimulus that can be detected www.notesolution.com
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