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Psych 463, Exam 1
Question | Answer |
---|---|
Number of senses? | 11 (5 basic senses, kinesthesis, weight, temperature, pain, time, & vestibular / balance). |
Receptor neurons? | Cells specialized for each sense; the first contact point. |
Transduction? | Transforming energy from one form to another. In the eyes, it involves the rods and cones. In the hearing, it's the hair cells in the inner ear. |
Psychological v. Physiological analysis? | Psychophysical focuses on stimulus-perception relationship (Weber fraction), while Physiological focuses on stimulus-neuronal relationship (receptive fields). |
Psychophysics? | |
Psychophysical Tasks? | 1. Absolute Threshold Detection 2. Difference Threshold Discrimination 3. Stimulus Identification 4. Magnitude Estimation |
Steven's Power Law? | Perceived Magnitude = KSn -K is some constant -S is stimulus intensity -n is some power (usually less than 1) |
Weber's Law? | DL / S = K, where -DL is the Difference Limen / the just-noticeable difference (jnd) -S is the value of the standard stimulus -K is a constant that varies from one sensory modality to another. Weber’s Law breaks down at extremes. |
Psychophysical Methods? | 1. Method of Adjustment 2. Staircase 3. Yes/No vs. Forced Choice 4 Signal Detection (Proportion of Hits vs. False Alarms) |
Subjectivity of Psychophysical Methods? | Forced choice eliminates subjective criterion (there is a correct answer). Magnitude estimation is inheriently subjective. |
Effiency of Psychophysical Methods? | Method of Adjustment is most Efficient, but is subjective. Constant stimuli is least efficient. Forced-choice staircase is a good compromise of efficiency and objectivity. Signal Detection is less efficient, but it does give measures of threshold. |
Signal Detection? | Either: 1. False Alarm 2. Hit 3. Miss 4. Correct Rejection |
Detectability? | Related to the ratio of Hits and False Alarms (really difference between normal curves divided by standard deviation). |
Criterion? | -Related to total number of Yes responses (Hits plus False Alarms) -Different people may have different criteria -Can be manipulated by changing payoffs. |
Perceptual Processes? | -Environmental Stimulus -Attended Stimulus -Stimulus on the Receptors -Transduction -Processing -Perception -Recognition -Action |