Many efficacy studies examining deep brain stimulation include only very small sample sizes. Why might this occur?
a. Researchers aren’t convinced it will work so they don’t recruit many participants for their studies.
b. Deep brain stimulation has long-term negative side effects that scare people away from participating.
c. The surgery required to implant the electrodes for deep brain stimulation is invasive.
d. The disorders targeted for treatment by DBS are so rare that it is difficult to find enough people to participate in a valid research study.
Answer: C
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