D Question 38 4 pts (Table: Sertraline and Electrical Current Therapy) Brunoni and colleagues (2006) investigated whether the combination of low-level electrical brain stimulation, transcranial direct current stimulation (tDCS), and a commonly used SSRI antidepressant (sertraline) would be effective in ameliorating depression in a group of clinically depressed individuals. The researchers randomly assigned participants to one of two medication conditions (placebo or sertraline) and to one of two brain electrical stimulation conditions (sham tDCS or active tDCS). The dependent variable was the individual's depression score on the Montgomery-Asberg Depression Rating Scale (MADRS) after 6 weeks of treatment. The statistics reported by the researchers are shown, and the average MADRS scores appear in the table. Effect of medication: F(1, 116) = 5.15, p 0.05 Table: Sertraline and Electrical Current Therapy Placebo_Sertraline__Sham 24.73 21.67 tDCS Active tDCS 19.07 13.1730 25 20 Montgomery-Asberg Type of stimulation depression rating 15 scale score Sham tDCS Active tDCS 10 5 Placebo Sertraline Medication (a) What significant effects did the authors find? You should report 3 different items and explain their significance (b) Use the cell means to graph and then interpret in words the results of the study