SOC

Question 1

What does the MSO do? What are the main inputs? What type of cell is it (EE, EI, EO, etc.)?

Answer 1

MSO is mostly tuned to low frequencies and responds to ITDs. It mostly has EE neurons.
EE= neuron increases firing rate for signals to both ears

Question 2

What does the LSO do? What are the main inputs? What type of cell is it (EE, EI, EO, etc.)?

Answer 2

LSO responds to ILDs and has mostly EI neurons.

EI = neuron excited from ipsi, inhibited from contra

Question 3

Explain the tonotopic organization of the MSO.

Answer 3

MSO has over-representation of low frequencies.

Question 4

Explain the tonotopic organization of the LSO.

Answer 4

LSO has over representation of high frequencies.

Question 5

Are MSO neurons tuned to ITD or ILD? Why?

Answer 5

MSO neurons are tuned to ITD. Sensitivity to ITD depends on simultaneous convergent excitation from the two ears.

Question 6

Rank order the following in terms of firing rate at relatively large levels for an MSO neuron: ipsilateral, contralateral, bilateral.

Answer 6

Bilateral, contralateral, ipsilateral

Question 7

Draw firing rates as a function of ITD for the MSO.

Answer 7

See picture.

Question 8

Draw firing rate as a function of ILD for the LSO.

Answer 8

See picture.