Chris is taking part in research on the effects of sleep deprivation; he has been without sleep for 75 hours. Right now researchers have asked him to sit in front of a computer screen and hit a button each time he sees the letter A on the screen. A few days ago, Chris was a whiz at this task; however, he is doing very poorly today. How are sleep researchers likely to explain Chris's poor performance?
◦ Due to the sleep deprivation, Chris does not understand the task.
◦ Due to sleep deprivation, Chris cannot concentrate on the task.
◦ He is determined to ruin the research because of the suffering he is enduring at the hands of the researchers.
◦ He is probably dreaming that he is somewhere else and has no interest in responding to the "here and now."
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