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Brain function and Sleep A study was conducted with fifty-five preteens (ages 9-12) who were not getting the recommended amount of sleep for their age. All preteens agreed to participate in the study. The participants were told they did not have to complete the study and could leave the study at any time. During the study, participants were randomly placed into either a group that gradually moved bedtimes earlier by five minutes each night or a control group that slept on their normal sleep cycle. The study's purpose was disclosed to participants once the study was over. 23. Which of the following ethical considerations was most problematic for this study? (A) Participants were not debriefed. (B) The risk to participants was too high. (C) The participants did not have the right to withdraw. | (D) Informed consent was not given for the preteens to participate in the study. v | Answer D Correct. Because the study involved preteens, parents needed to provide informed consent before the preteens could participate in the study. 24. An adult with a healthy sleep cycle is most likely to enter REM sleep in which of the following ways? (A) immediately after falling asleep (B) after the dream stage is completed (C) after cycling through the NREM sleep stages w (D) soon after falling asleep and then remain there for the majority of the night | Answer C Correct. REM sleep occurs after other NREM sleep stages have been cycled through. 25. REM sleep, generally an \"active\" state of sleep, is accompanied by which of the following paradoxical characteristics