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Lecture

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Department
Psychology
Course
PSY280H1
Professor
Kristie Dukewich
Semester
Fall

Description
PSY280: Lecture 1 Notes 1. Recognize the 6 general components of the perceptual process - Environmental stimulus - Stimulus is transformed and receptor processes - Neural processing o It starts at the level of receptor - Perception - Recognition o Top-down processing o Bottom-up processing - Action o Action in response to stimulus o Action can also profoundly change our sensation of information 2. Make arguments in favor of perception being a valid topic of scientific investigation - Sensation and perception are the foundation for mental event - It is the about mental experience - Thus, it is in the domain of psychology 3. Recognize the relationships between stimulus, perception and physiology, in the 3 general approaches to the study of perception - Psychophysics - Neural recordings (for stimuli and physiology), e.g. electrodes insertion - Neural activity during psychophysics (for physiology and perception), e.g. neuroimaging 4. Distinguish between 3 classical methods in psychophysics - Method of limits - Method of adjustment - Method of constant stimuli 5. Describe the ways in which absolute threshold can be established - By the 3 classical methods in psychophysics 6. Use psychometric functions to derive the relationships between stimulus intensity and perception - 3 different relationships for sensation magnitude against stimulus intensity o Linear o Exponential (response expansion) o Logarithmic (response compression) 1 7. Identify the variables used to calculate Weber’s fractions Weber’s fraction: ΔI = k x I - ΔI: Just noticeable difference - K: Weber Fraction - I: reference intensity Different sensations have different corresponding Weber fraction 8. Identify the variables in the Steven’s Power Function used to describe magnitude estimations and how they relate to the kind of relationships that are possible P= KS n - P: perceived intensity - K: constant - S: stimulus intensity - n: exponent (slope of log) If n=1, it is linear relationship If n>1, it is exponential relationship If n<1, it is logarithmic relationship 9. Determine the difference between a liberal vs. conservative response criteria - A liberal ten
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