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Psychophysics #1
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- 1Psychophysics is primarily concerned with...The relationship between the properties of a stimulus (stimulus intensity) and the perception or experience of that stimulus
- 2What are overt behavioural reponses and what are they used for?In optometry they ask subjects whether something seems clearer, in perception research they ask if a light is brighter. Also monitoring "preferential looking" or behavioural responses to stimuli
- 3Absolute ThresholdThe smallest stimuli intensity required for perception
- 4The detection problemIs there something there? What is the minimum amount of stimulus energy required to detect a stimulus?
- 5The discrimination problemIs this different from that? What is the smallest amount of stimulus energy change which results in a discrimination
- 6Scaling ProblemHow much of the property is there?
- 7Difference ThresholdSame as discrimination problem. Minimum change in stimulus energy required to equal change in reported experience
- 8—Method of Limits. Begin either with easily detectable stimulus or non-detectable stimulus and Ascend/Descend until you reach a change in reported experience
- 9—Method of Constant Stimuli. Randomise the possible intensities and then have participants report existance of experience or not
- 10—A theoretical graphic Representation of the results of a method of constant stimulus measureing thresholds
- 11—An emperical graphic Representation of the results of a method of constant stimulus measuring thresholds. This is a psychometric function, or ogive
- 12AT in psychometric functions is...When there is equal "yes" and "no" responses, i.e. at 50%
- 13—Examples of Absolute detections
- 14Response Biases"Liberal" subjects have a tendency to answer "yes" when uncertain, "Conservative" subjects will answer "no" when uncertain.
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- (Psychophysics) Fichas sobre Psychophysics #1, creado por cjjstone el 05/05/2014.
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- cjjstone
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