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1.24.12 pt 2 - Chapter 2 Research Design and the Behavioral...

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Chapter 2 Research Design and  the Behavioral Analysis  of Drug Effects
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Variables Experiment : attempt to find a relationship  between two events or variables Independent Variable: The variable that is  manipulated. (In behavioural pharmacology, its  usually the amount/type of drug) Dependent Variable: The observed event (what  can be measured, e.g. behaviour).
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Experimental Control You need to be able to compare what  happened when you gave the drug  (experimental condition)  with what would  have happened if you did not give the drug  (control condition). The experimental and control conditions  must be exactly the same except for the  presence and absence of the drug.
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Designs Between-subjects design : comparison of  different subjects in each condition Within-subjects design : comparison of the  same subjects in multiple conditions over  time
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Within-subjects design  Each subject is his/her own control Each subject tested in each condition Dependent variable must have a stable baseline Advantage better control condition – no individual variation Disadvantage Can only be used with stable dependent variable Take more time, but use fewer subjects
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Within-subjects design Aspirin Tylenol No drug Pain relief for subjects with chronic headaches
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Between-Subjects design Subjects randomly assigned to groups
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