NOTE: Answer are in parantheses, EXPLAIN THE REASONING TO WHY chosen answer is c

Question

NOTE: Answer are in parantheses, EXPLAIN THE REASONING TO WHY chosen answer is correct and the others are incorrect

6 pts. 1. The bottom part of the diagram below shows an array (A-E) of location-encoding neurons in a brainstem auditory nucleus. Each solid line ending in a filled dot is an axon making an excitatory synapse onto the postsynaptic neuron. Location-encoding neurons (1-5) send information to higher brain centers 4 Input from left ear Input from right ear 1-1. Which neuron will most likely fire an action potential in response to a sound originating directly to the person's right side? (a) a. neuron A b. neuron B c. neuron C d. neuron D e. neuron E

Explanation / Answer

Ans 1. The right hemisphere of the brain controls the left part and left controls the right. As the crossing of nerves takes place at the brain stem. Injury to the right hemisphere causes impairement of the left. As the right controls the left part. The sound received by the right side triggers an action action potential at the right side. Hence the action potential would be initiated at neuron A.

Ans 2. In order for the better encoding the synapse between 1-5 should be inhibitory. As excitatory synapse has been associated with hearing loss. Excitatory synapse is characterised by NMDA antagonism and increased amplitude and decreased frequency of sound.

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