Study Guides (248,311)
United States (123,312)
Psychology (665)
PSYC 4031 (8)
All (8)
Midterm

Sensation And Perception Test 1 Notes

10 Pages
73 Views
Unlock Document

Department
Psychology
Course
PSYC 4031
Professor
All Professors
Semester
Winter

Description
Chapter TwoResearch MethodsSignal Detection Theory Three classical methods of psychophysics that we have examined have a common goal locating a thresholdSIGNAL DETECTION THEORYargues that the thresholds obtained by classical psychophysical methods are composites of two separate processes 1 The observers sensitivity to the stimulus and2 the observers decisionmaking strategy or criterionSIGNALwhere a weak physical stimulus is presentNOISEwhere no physical stimulus is present only background noiseThe physical stimulus alone is not sufficient to determine perceptionmental factors are also criticalSN Signal to noise ratioReceivers often report sensitivity in terms of SN ratio with higher numbers indicating increased sensitivityWhen you expect a stimulus you shift your criterionCRITERIONwillingness to say that you detect a stimulusDesign of a signal detection experiment SIGNALNOISEA set of trials that include both the signal that one is supposed to detect as well as the background noiseCORRECT REJECTIONWhen an observer says No and there is no stimulus presentFALSE ALARMWhen an observer says Yes and there is no stimulus presentHITWhen an observer says Yes and there is a stimulus presentMISSWhen an observer says No and there is a stimulus presentMAINTAINED ACTIVITYthe spontaneous firing of the brain cells even in the absence of stimulationMost subjective intensity is centered around a score of 3 rarely reaching very high 5 or very low 1Distinguishing between sensitivity and criterion d d prime is used as an index of sensitivityFigures 24 and 25 in the bookThe origin of the measure of sensitivity d is basically the distance between the peaks of the two distributions
More Less

Related notes for PSYC 4031

Log In


OR

Join OneClass

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

Sign up

Join to view


OR

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.


Submit