Questions: If a person hears a tone of 3000 Hz , three groups of neurons take turns sending the message to the brain-the first group for the first 1000 Hz , the second group for the next 1000 Hz , and a third for the next 1000 Hz . This principle is known as the a. volley principle. b. place principle. c. relay principle. d. frequency principle.

The answer is the first one (or A): the volley principle.

Explanation for each option:

a. Volley principle: This principle suggests that groups of neurons can take turns firing to send higher frequency signals to the brain. In this case, the neurons are working together to send the 3000 Hz signal by dividing the task among three groups, each handling 1000 Hz. This matches the description given in the question.

b. Place principle: This principle states that different frequencies of sound waves stimulate different places along the cochlea. It does not involve groups of neurons taking turns to send the message to the brain, so it is not applicable here.

c. Relay principle: This is not a recognized principle in the context of auditory processing. Therefore, it is not the correct answer.

d. Frequency principle: This principle suggests that the frequency of the auditory nerve's impulses matches the frequency of the tone, but it does not involve multiple groups of neurons taking turns. Hence, it does not fit the scenario described in the question.

Summary: The correct answer is A: the volley principle, as it accurately describes the process where groups of neurons take turns to send parts of the signal to the brain.