COGS 14A Lecture Notes - Lecture 18: Pseudorandomness, Prenatal Care, Random Assignment
28 Feb 2017
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Cogs 14a lecture 18 notes: within-subjects; quasi- experiments 2/27/17. Can test different levels of independent variables in the same individual. Can also take many measures at each level of independent variable. Allows for many comparisons of stimuli in each condition for example, you could take hundreds of eeg recordings for the same people, experiencing many different trial types. When participants go through all possible values of the independent variable, they are exposed to more information over a longer period of time (compared to between group designs. Due to repeated exposure to the stimuli, the participants have more opportunities to figure out the experiment this may lead them to change their behavior to please or thwart the experimenter. One way to control for this is to use filler trials, to distract the participants and keep them from figuring out what is happening. Practice effects: as you perform a task more, you get better.
