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Psych 463, Exam 1

QuestionAnswer
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
Created by: 1256828643