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Canada (161,798)
Psychology (9,695)
PSYA01H3 (1,206)
Steve Joordens (1,058)
Chapter 5

PSYA01 chapter 5 notes

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Steve Joordens

Psychology Chapter 5 Sensation Sensory Behavior Sensation the detection of the elementary properties of a stimulus o i.e. brightness, colors, warmth, and sweetness Perception the detection of the more complex properties of a stimulus, including its location and nature; involves learning o Both inanimate and animate objects I.e. Seeing the color red is sensation, seeing a red apple is perception Sensory mechanisms visual, auditory, gustatory, olfactory, and somatosensory systems Transduction Sense organs detect stimuli provided by light, sound, odor, taste, or mechanical contact with the environment o Information about these stimuli is transmitted to the brain through neural impulses Action potentials carried by the axons in sensory nerves Task of sense organs is to transmit signals to the brain that are coded in such a way as to represent faithfully the events that have occurred in the environment Task of the brain is to analyze this information and reconstruct what has occurred Transduction the conversion of physical stimuli into changes in the activity of receptor cells o sensory organs o Sense organs convert energy from environmental events into neural activity Receptor cells release chemical transmitter substances that stimulate other neurons, thus altering the rate of the firing of their axons Receptor cell a neuron that directly responds to a physical stimulus, such as light, vibrations, or aromatic molecules www.notesolution.com Somatosenses (body senses) dendrites of neurons respond directly to physical stimuli without the intervention of specialized receptor cells TABLE 5.1 PAGE 130 Sensory Coding Action potentials are fixed in size and duration o Cant be altered Different stimuli cannot be translated into different types of action potentials Code system of symbols or signs representing information Sensory system transmit information take two general forms o Anatomical coding o Temporal coding Anatomical coding a means by which the nervous system represents information; different features are coded by the activity of different neurons o Interpret the location and type of sensory stimulus according to which incoming nerve fibres are active o Sensory coding for the body surface is anatomical Temporal coding a means by which the nervous system represents information; different features are coded by the pattern of activity of neurons o Coding in terms of time o rate The firing of a particular set of neurons (an anatomical code) tells where the body is being touched; the rate at which these neurons fire (a temporal code) tells how intense that touch is Psychophysics Systematic study of the relation between the physical characteristics of stimuli and the sensations they produce o Physics of the mind www.notesolution.com
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