Textbook Notes (367,876)
Canada (161,461)
Psychology (9,695)
PSYA01H3 (1,206)
Steve Joordens (1,058)
Chapter 5

chapter 5

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Steve Joordens

Psychology Chapter 5: Sensation -Everything we learn is detected by sense organs and transmitted to our brains by sensory nerves -Provides useful information about external world -Milner and Goodale: Vision evolved to provide distal sensory control of movements that the animals make in order to survive and reproduce -Audition is extremely important for our social behaviour -Vision: provides info about distant events, as with smell, tells us about sources of aromatic molecules far upwind Sensory Processing: -Sensation: detection of elementary properties of a stimulus, ex. warmth, color -Perception: detection of the move complex properties of a stimulus, including its location and nature; involves learning, -Ex. seeing color red is a sensation and seeing a red apple is perception -Pure sensation involves prewired physiological mechanisms Transduction: -Sense organs: detect stimuli provided by light, sound, odour, taste, or mechanical contact with environment -this info is transmitted to brain by neural impulses (action potential) -Task of the brain is to analyze info and reconstruct -Transduction: conversion of physical stimuli into changes in the activity of receptor www.notesolution.comcells of sensory organs -Receptor Cells: neuron that directly responds to a physical stimulus, such as light, vibrations, or aromatic molecules Sensory Coding: -Code = system of symbols or signals representing info -Have two forms: anatomical coding and temporal coding -Anatomical Coding: means by which the nervous system represents information; different features are coded by the activity of different neurons -Temporal Coding : means by which the nervous system represents information; different features are coded by the pattern of activity of neurons -simplest form = rate (how intense it is) Psychophysics: -Psychophysics: branch of psychology that measures the quantitative relation between physical stimuli and perceptual experience -Weber: investigated ability of humans to discriminate between various stimuli -Just-noticeable difference (jnd) = smallest change in magnitude of stimuli that c person can detect -Weber fraction: ratio between jnd and the magnitude of a stimulus; reasonably constant over the middle range of most stimulus intensities -Fechner: used Webers concept to measure peoples sensations and showed how a logarithmic function could be derived from Webers principal -Norwich and Wong: provided a technical overview of how these perspectives relate to each other -S.S. Stevens: came up with the formula: S = kIb (exponential b) -S = psychological magnitude of sensation www.notesolution.com
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