Psychology 2800E Lecture Notes - Lecture 15: Sound Intensity, Classical Conditioning, Krypto

• School: Western University
• Department: Psychology
• Course: Psychology 2800E
• Professor: Patrick Brown

Document Summary

De nition: when a variable is manipulated w/in subjects, all subjects receive all levels of that variable studies may use b/t groups only, w/in groups only or both. Eg, which of 3 cars is most comfortable (ford, chevy & toyota 10 volunteers) Each volunteer drives each car on same length journey & rates each for comfort. Reasons for use: few participants are available e. g. studying prosopagnosia. Increase ef ciency e. g. instead of 2 treatment groups, do 2 studies. When theres no acceptable matching procedure e. g. cannot measure enthusiasm. Increase sensitivity ability to detect the effect of an iv. Each subject is her own control, reducing error variability due to individual differences. Reducing error variability is analogous to turning up the magni cation of a microscope. To study differences in participants over time; if u want subjects to compare 2/more stimuli relative to one another learning & psychophysics.