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Lecture Note For Chapter 23, come and see

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University of Toronto Scarborough
Christian Campbell

Chapter 23: Doing Research in Behavior Modification Minimal behavior modification program has 4 phases: 1) Screening phase: clarifying the problem and determining who should treat it 2) Baseline phase: determining the initial level of the behavior prior to the program 3) Treatment phase: intervention strategy is initiated 4) Follow- up phase: evaluating the persistence of the desirable behavioral changes following termination of the program In any program in which a treatment phase is introduced for the purpose of modifying some behavior, it is quite possible for an uncontrolled or interfering variable or condition to occur concurrently with the treatment, such that the change in the behavior is due to the uncontrolled variable rather than the treatment itself BM research project attempts to demonstrate that it was the treatment, rather than some uncontrolled variables that was responsible for the change in the behavior in question The reversal-replication (ABAB) research design Reversal: going from treatment back to baseline conditions Should be able to replicate both the original baseline and the original treatment effects Able to demonstrate cause-effect relationship between a particular behavior and treatment program Baseline= A and treatment= B Can also be called withdrawal design for the reason that during the B phases the treatment is withdrawn How long should the baseline last? the pattern of behavior should appear stable and predictable and the trend observed should be in a direction opposite to the effect predicted for the independent variable acting on the dependent variable. Other considerations to shorten or lengthen baseline o Scientific considerations related to the newness of the independent and dependent variables being studied; one might be more comfy conducting a shorter baseline in a new study of behavior that has been already been well researched than in a study of a less explored area; o Practical considerations might limit the length of baseline observations; available time of the experimenter, the availability of observers, restrictions on students for completing projects on time and any of a number of other factors might lead one to limit or extend the baseline for nonscientific reasons o Ethical considerations often affect baseline length How many reversals and replications are necessary? if one observes a very large effect when the independent variable is introduced, and if the area is one that has been explored before, then one replication may be sufficient Limitations: undesirable to reverse to baseline conditions following a treatment phase; impossible to obtain a reversal due to behavioral trapping; other behaviors might be trapped by the individuals physical rather than social environment Multiple-baseline Design Used to demonstrate the effectiveness of a particular treatment without reversing to baseline conditions Multiple-baseline-across behaviors: research design in which two or more behaviors are monitored concurrently and, in a staggered fashion, the treatment is introduced sequentially to each of the behaviors o Application of this design assumes that the behaviors are relatively independent o If apply treatment to only one behavior but if improvement observed in all three behaviors concurrently, then cannot confidently attribute the improvement to the treatment itself o Limitation: may not be possible to find two or more suitable behaviors or sufficient observers to gather the necessary data on several behaviors Multiple baseline across situations: a research design in which a single behavior is monitored in two or more situations, and in a staggered fashion, the intervention is introduced sequentially to the behavior in each of the situations
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