Sid 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 be sees the letter "s" on the screen. a few days ago, sid was a whiz at this task; however, he is doing very poorly today. how are sleep researchers likely to explain sid's poor performance?
a) due to the. sleep deprivation, sid does not understand the task.
b) microsleeps are occurring due to the sleep deprivation, and he is asleep for brief periods of time.
c) he is determined to ruin the research because of the suffering he is endurlng at the hands of the researchers.
d) he is probably dreaming thathe is somewhere else and has no interest in responding to the "here and now."
e) .the researchers have changed the speed of the testing and sid is unable to keep up.

b) Microsleeps are occurring due to the sleep deprivation, and he is asleep for brief periods of time.

Explanation:

Micro-sleep refers to a period of dozing off or sleeping temporary for a fraction of a second to 30 seconds which causes a person to be unable to respond to certain sensory situation and for that moment it like they are unconscious; they can not see or feel anything in those seconds during which micro-sleep hit them.

So for a second a person is awake and another they are not awake and there is a shift between these two states.

A person drifts off slowly and has their eyelids shutting down slowly until they shut completely or slightly and they head goes down to their chest as if they are nodding .

It usually happens when a person has not had enough sleep like Sid in the above text which is making it hard for him to see the S on the screen.

answer; (d) one tectonic plate plunges beneath another; (most common,convergent boundaries)