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Chapter 11 - Skeleton - Psy250 Scientific Inquiry Chapter...

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Single Case, Quasi- Experimental, and Developmental Research Psy250: Scientific Inquiry Chapter 11
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Recall….
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Other research designs have been created to address special research problems Single case experimental designs: effect IV must be inferred from experiment w/ only 1 participant Pre-experimental and quasi-experimental designs: used when not possible to use true experimental design Developmental designs: study changes that occur with age.-
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Single Case Experimental Designs Single case experiment: experiment in which the effect of IV is assessed using data from single participant. a.k.a. single-subject or single participant designs Often used in education, clinical research, and applied settings First, subjects behavior is measured over baseline control period Then, manipulation introduced during treatment period, while behavior continues to be measured
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Single Case Experimental Designs Changes from baseline to treatment period provides evidence IV had an effect But could be many other possible explanations Some other event may have coincided with introduction of treatment Reversal designs, multiple baseline designs, and replications seek to deal with some problems of single case designs
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Reversal Designs Seeks to demonstrate IV had an effect by reversing manipulation A (baseline period) -> B( treatment period)->A(baseline period) ABA design aka withdrawal design ( because treatment withdrawn or removed from 2 baseline period)
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Reversal Designs Can be improved by extending to ABAB or ABABAB design A( baseline period)->B(baseline period)->A(baseline period)-> B(treatment period) ABAB and ABABAB designs More powerful than ABA- in these designs less likely random fluctuation or other event led to observed changes. Fewer ethical concerns – doesn't seem right to end study w/ w/drwan of treatment. Can feature control group
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Multiple Baseline Designs Some reversal designs impossible or unethical Might not be ethical to remove beneficial treatment Some treatments produce long-lasting effects that cannot be undone Multiple baseline design: observe behavior before and after manipulation under multiple circumstances( across different individuals behaviors, or settings) Behavior should only be different after manipulation introduced Rule out possibility other events were responsible
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Multiple Baseline Designs Multiple baseline across subjects: behavior of several subjects recorded over time. Manipulation introduced at different point in time for each subject Multiple baseline across behaviors: several different behaviors of a single subject measured over time. Manipulation introduced at different point in time for each behavior
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Multiple Baseline Designs Multiple baseline across situations: same behavior measured in different settings.
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  • Summer '10
  • BriannaLHarris
  • Longitudinal study, Cross-sectional study, multiple baseline designs, Nonequivalent Control Group Design, Case Experimental Designs

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