Mary, who has trichotillomania (chronic hair pulling)is using an ABAB design to see if she pulls more hair while watching T.V. She watched T.V. during dinner for four weeks and pulled at least ten hairs a day for the four weeks. Then she left the T.V. off for four weeks and pulled only one hair per day for the four weeks. In the next step of this design, Mary should

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In an ABAB design, the second A phase is used as a baseline comparison to see if the behavior changes when the intervention (in this case, turning the TV off) is introduced. The B phase is used as a comparison to see if the behavior returns to the original level when the intervention is removed. Therefore, in this case, Mary should turn the TV back on for four weeks to see if the behavior of hair pulling increases again. The other options are not relevant to the research question of whether hair pulling is affected by watching TV.

Mary, Who Has Trichotillomania (Chronic Hair Pulling)is Using an ABAB