Neuroscientists Conducting Research on What Happens in the Brain During

question 468

Multiple Choice

Neuroscientists conducting research on what happens in the brain during REM and NREM sleep are likely to find that levels of certain neurotransmitters surge while levels of other neurotransmitters recede. According to Focus on Neuroscience: The Dreaming Brain, which of the following happens during REM sleep?

• A) When the activity of REM-on neurons and acetylcholine levels reach a certain threshold, the characteristic signs of REM sleep emerge.
• B) When acetylcholine and REM activity peaks, REM-off neuronal activity picks up, increasing serotonin and norepinephrine levels.
• C) When REM-off neuronal activity and levels of serotonin and norepinephrine increase to a certain threshold, REM sleep is suppressed and the characteristic features of slow-wave NREM sleep emerge.
• D) All of these happen during REM sleep.

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Definitions:

Internal Rate

An implied interest rate that equates the present value of an investment's expected future cash inflows to its initial cost.

Investment Proposals

Formal suggestions or plans put forward for consideration, aimed at initiating a financial investment.

Discount Rate

The discount rate applied in the evaluation of the present value of future cash flows in discounted cash flow analysis.

Present Value

The current worth of a future sum of money or stream of cash flows, given a specified rate of return.