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A researcher studying cats discovered that during the dream state of

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A researcher studying cats discovered that during the dream state of  [#permalink]

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New post 17 Jan 2019, 00:36
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A researcher studying cats discovered that during the dream state of sleep, the cerebral cortex of a cats brain fires messages to its body as rapidly as it does during wakefulness. In an effort to determine why the sleeping cat's body does not respond to the messages being fired by the brain, the researcher removed a cluster of neurons from a sleeping cat's brain stem, the part of the brain that connects the cerebral cortex to the spinal cord. After he had done so, the still sleeping cat got up, pounced as if it were chasing a mouse, and arched its back.

Which of the following, if true, taken together with the information above best supports the conclusion that the sleeping cat was acting out its dreams?

A. The neurons that were removed from the brain stem normally serve to trigger the dream state of sleep and the rapid brain activity that accompanies it.

B. The cerebral cortex is able to receive and transmit sensory information even when the brain is in a sleeping state.

C. The neurons that were removed from the brain stem are normally responsible for transmitting messages from the cerebral cortex.

D. The neurons that were removed from the brain stem normally prevent messages fired by the cerebral cortex during sleep from being received by the spinal cord

E. The types of brain waves produced by the cerebral cortex during sleep have distinctly different properties from those produced during a wakeful state.

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Re: A researcher studying cats discovered that during the dream state of  [#permalink]

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New post 13 Mar 2019, 07:15
Bunuel wrote:
A researcher studying cats discovered that during the dream state of sleep, the cerebral cortex of a cats brain fires messages to its body as rapidly as it does during wakefulness. In an effort to determine why the sleeping cat's body does not respond to the messages being fired by the brain, the researcher removed a cluster of neurons from a sleeping cat's brain stem, the part of the brain that connects the cerebral cortex to the spinal cord. After he had done so, the still sleeping cat got up, pounced as if it were chasing a mouse, and arched its back.

Which of the following, if true, taken together with the information above best supports the conclusion that the sleeping cat was acting out its dreams?

A. The neurons that were removed from the brain stem normally serve to trigger the dream state of sleep and the rapid brain activity that accompanies it.

B. The cerebral cortex is able to receive and transmit sensory information even when the brain is in a sleeping state.

C. The neurons that were removed from the brain stem are normally responsible for transmitting messages from the cerebral cortex.

D. The neurons that were removed from the brain stem normally prevent messages fired by the cerebral cortex during sleep from being received by the spinal cord

E. The types of brain waves produced by the cerebral cortex during sleep have distinctly different properties from those produced during a wakeful state.



I cant get how D is right answer. If part removed prevent message to spinal cord how did cat react.
I thought answer is B..please explain both stems.
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A researcher studying cats discovered that during the dream state of  [#permalink]

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New post 13 Mar 2019, 10:31
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Bunuel wrote:
A researcher studying cats discovered that during the dream state of sleep, the cerebral cortex of a cats brain fires messages to its body as rapidly as it does during wakefulness. In an effort to determine why the sleeping cat's body does not respond to the messages being fired by the brain, the researcher removed a cluster of neurons from a sleeping cat's brain stem, the part of the brain that connects the cerebral cortex to the spinal cord. After he had done so, the still sleeping cat got up, pounced as if it were chasing a mouse, and arched its back.


Which of the following, if true, taken together with the information above best supports the conclusion that the sleeping cat was acting out its dreams?

Information: Cerebral cortex (part of brain) sends the message to the cat's body with equal frequency in both sleeping and wakeful

state. But, while the cat responds to the messages in the wakeful state, it does not do the same in the sleeping state. Why? Now what the researchers did

? They removed some neuron clusters from the part of the sleeping cat's brain that connects cerebral cortex and spinal chord. Now, they found that cat

has started reacting to the messages. This simply shows that the removed neurons' cluster were blocking the messages from cerebral cortex to spinal

chord.


A. The neurons that were removed from the brain stem normally serve to trigger the dream state of sleep and the rapid brain activity that accompanies it.

If this were true, then the cat would have reacted to the messages in the dream. And removal of neuron cluster would have done the opposite.

B. The cerebral cortex is able to receive and transmit sensory information even when the brain is in a sleeping state.

We know this from the passage that cerebral cortex does this function. But this info is not helpful in solving why cat does not react even after sending of signals from the cerebral cortex.

C. The neurons that were removed from the brain stem are normally responsible for transmitting messages from the cerebral cortex.

If this were true, then the cat would not been reacted after their removal from the brain. Same as A.

D. The neurons that were removed from the brain stem normally prevent messages fired by the cerebral cortex during sleep from being received by the spinal cord.

Correct : As per explanation above (blue text)

E. The types of brain waves produced by the cerebral cortex during sleep have distinctly different properties from those produced during a wakeful state.

Not helpful. Different does not mean non-effective.

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Re: A researcher studying cats discovered that during the dream state of  [#permalink]

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New post 13 Mar 2019, 13:49
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Mohammad Ali Khan wrote:
Bunuel wrote:
A researcher studying cats discovered that during the dream state of sleep, the cerebral cortex of a cats brain fires messages to its body as rapidly as it does during wakefulness. In an effort to determine why the sleeping cat's body does not respond to the messages being fired by the brain, the researcher removed a cluster of neurons from a sleeping cat's brain stem, the part of the brain that connects the cerebral cortex to the spinal cord. After he had done so, the still sleeping cat got up, pounced as if it were chasing a mouse, and arched its back.

Which of the following, if true, taken together with the information above best supports the conclusion that the sleeping cat was acting out its dreams?

A. The neurons that were removed from the brain stem normally serve to trigger the dream state of sleep and the rapid brain activity that accompanies it.

B. The cerebral cortex is able to receive and transmit sensory information even when the brain is in a sleeping state.

C. The neurons that were removed from the brain stem are normally responsible for transmitting messages from the cerebral cortex.

D. The neurons that were removed from the brain stem normally prevent messages fired by the cerebral cortex during sleep from being received by the spinal cord

E. The types of brain waves produced by the cerebral cortex during sleep have distinctly different properties from those produced during a wakeful state.



I cant get how D is right answer. If part removed prevent message to spinal cord how did cat react.
I thought answer is B..please explain both stems.


Hi,
Bold part in the statement is the player that makes it the correct choice.
“The neurons that were removed from the brain stem normally prevent messages fired by the cerebral cortex during sleep from being received by the spinal cord”
Had neurons not been removed, cat would have still been sleeping.

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Re: A researcher studying cats discovered that during the dream state of   [#permalink] 13 Mar 2019, 13:49
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