Need psychology help with Single-Subject Methods

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How are the single-subject methods unique to experimental research?

Think of a problem behavior that you might want to improve upon in one of your future clients, and devise a single-subject design to study the effectiveness of your new intervention (nail biting)

Which single-subject approach would you use here (baseline, discrete trials, dynamic), and why?


Dec 20th, 2015

Thank you for the opportunity to help you with your question!

I am using a multiple baseline technique. 

Example: Multiple-Baseline: 

A pre-intervention reading fluency baseline is established for all three students (Bill, Gloria, and Bob). The data is usually collected concurrently across all three participants. 

After three to five trials and assuming a stable baseline is established, Bill is introduced to the experimental condition, a reading fluency  program. The program is introduced while the other two subjects continue with the baseline condition.

After three to five more trials, Gloria goes into the experimental phase. The third student, Bob, continues with the baseline condition. 

After three to five more days, Bob starts the experimental phase while the other two participants continue in the intervention phase.

In this example, the dependent variable is the number of words read correctly during a one-minute time period, and the independent variable is the three students. 
This design allows the teacher to know that the intervention is effective for Bill and Gloria but is not working for Bob.


Alternating Treatment Design

The alternating treatment design is used to compare the effects of two treatments on one subject. Two interventions or practices are introduced and alternated at each of the training sessions. The teacher determines randomly which of the two experimental interventions to select for each session. This design offers the teacher a method for comparison of the two interventions is better suited to improving the student’s performance. 

Please let me know if you need any clarification. I'm always happy to answer your questions.
Dec 20th, 2015

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