Class Notes (835,539)
Canada (509,225)
Psychology (7,782)
PSYA01H3 (847)

APLUS PSYA01 Textbook Notes - Chap 5-9.pdf

95 Pages
Unlock Document

Steve Joordens

PLEASE DO NOT COPY - Ex. rub your eyes  light-sensitive receptors are there, and they are mechanically stimulated  action potentials are produced in the optic nerves  brain acts as if the neural activity in the optic nerves was produced by light  you see stars and flashes - This can be seen in the other senses too - artificially stimulate the nerves that convey taste  sensation of taste - electrical stimulation of the auditory nerve  sensation of a buzzing noise Temporal Coding - Temporal coding: a means by which the nervous system represents information; different features are coded by the pattern of activity of neurons - it is in terms of time - The simplest form of temporal code is rate: by firing at a faster/slower rate according to the intensity of a stimulus, an axon can communicate quantitative information to the brain - Ex. light touch  encoded by a low rate of firing; more forceful touch  by a high rate of firing - Anatomical coding: The firing of particular set of neurons tells where the body is being touched - Temporal coding: the rate at which these neurons fire tells how intense that touch is Psychophysics - Psychophysics: a branch of psychology that measures the quantitative relation between physical stimuli and perceptual experience - physics of the mind - Scientists have to find ways to measure people’s sensations, and there are two methods: the just-noticeable difference and the procedures of signal detection theory The Principle of the Just-Noticeable Difference - Weber looked at the ability of humans to discriminate between various stimuli, he measured the just-noticeable difference (jnd) - just-noticeable difference (jnd): the smallest difference between two similar stimuli that can be distinguished; also called difference threshold - The jnd is directly related to the magnitude of that stimulus - Give people two metal objects and ask if they were different in weight - participants said they were the same unless they differed by a factor of 1 in 40 (they could barely distinguish 40 g and 41 g; 80 g and 82 g, etc. - the difference in weight between 40 and 41 g, and 80 and 82 g is the jnd - Different senses had different ratios ex. ratio for differences in brightness of white light is 1 in 60 - Weber fraction: the ratio between a jnd and the magnitude of a stimulus; reasonably constant over the middle range of most stimulus intensities - Fechner: used Weber’s concept of the jnd to measure people’s sensations - assumption: the jnd was the basic unit of a sensory experience - he measured the absolute magnitude of a sensation in jnds - Experiment: put participant in dark room and have two bulbs (one is sample, one is comparison) - sample is turned off, comparison is brightened until they notice a difference  the value is one jnd - set sample to one jnd, comparison is brightened until they notice a difference  the value is two jnds - continue this until the lights become uncomfortably bright th Notes by Mary Lee Notes from Psychology the Science of Behavior 4 Ed Carlson/Heth
More Less

Related notes for PSYA01H3

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.