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Psychology 1010 , week 7 notes

by: Sydney Hendertilo

Psychology 1010 , week 7 notes PSYC 1010

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Sydney Hendertilo

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Sensation and Perception Lecture notes
Introductory Psychology
Dr. Fischer
Class Notes
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This 3 page Class Notes was uploaded by Sydney Hendertilo on Tuesday October 4, 2016. The Class Notes belongs to PSYC 1010 at Wayne State University taught by Dr. Fischer in Fall 2016. Since its upload, it has received 86 views.


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Date Created: 10/04/16
Psychology 1010  Sensation and Perception o Detecting vs. Knowing  Psychophysics o This is the earliest experimental field of psychology o Question: Do processes in the brain follow natural physical laws?  *Answer: Inspired by research in physics  Characterizing the “Black Box” Independent Variable o Manipulate physical stimulus  Light sound Dependent Variable o Perception  Subjective response  Threshold o First psychology experiments determined limits of sensory systems.  Measured thresholds: minimum that can be detected  Ex.) IV: Independent Variable = Manipulate levels of light  Ex.) DV: Dependent Variable= Ask subject if they can detect light (subjective response)  Psychometric function: Subjective responses vs. stimulus intensity  What causes variability o Noise  Internal: the spontaneous, random firing of neurons  External: Noise present in the environment o Response Bias  A person has to decide whether or not to report a stimulus  Since response is subjective, it can be influenced by bias of the observer  What influences response bias o Habits  People have a tendency to respond the same way if uncertain o Cost benefits  Perceived cost: does the subjective believe there is a particular cost or benefit for making a particular response  Changing the cost or benefit of the decision can influence responding  Signal detection theory (TSD) o Measures decision making process (BIAS)  Assumes detecting information is a decision  TSD assumes two processes 1. Sensory process: capabilities of ones sensory system;presense of noise 2. Decision process: subjective response based on habits; cost/benefit Ex.) IV: Independent Variable, manipulate levels of light DV: Dependent Variable, ask subject if they can detect (subject response)  Catch Trials: Trials where no lights is presented o These trials allow measurements of response bias (ex. If a person habitually reports “yes”, will see more “yes” responses in catch trials.  Observer response o Signal present  Hit (correct)  Mass (mistake) o Signal absent  False alarm (mistake)  Correct rejection (correct) o “yea sayer”-biased to increase hits and avoid misses  Trade-off: more false alarms o “nay sayer”-biased to avoid false alarms  Trade off : fewer hits (more misses) but more correct rejections  The “just noticeable difference” o A change threshold  The change in something until it is “just noticeable” o JNP depends on where you are standing from  JNP experiment : You work for a soft drink company o You are asked to make the drink just noticeably sweetener using the minimum amount of sweetener. o  The just noticeable difference o Webber’s law  Change needed to detect a difference from a baseline is a constant for a given  property Basic process of sensation               1.reception  Detection by specialized receptors  2.Transduction  Conversion into a neutral signal coding 3.coding  Neutral code of stimulus Ex.) stimulus molecules attach to receptors


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