Question 1: (a) How does the response of the unit change when you change g_bar_l? Why?

(b) How does this differ from changes to g_bar_e?

(c) Use the same technique you used in the previous question to compute the exact amount of leak current necessary to put the membrane potential exactly at threshold when the g_bar_e value is at the default of .4.

Question 2: (a) What happens to the unit's activity if you change the leak reversal potential e_rev_l from .15 to 0?

(b) What about when you increase it to .2? For both questions, explain the results, taking note of what happens before the input goes on as well as what happens while it is on.

(c) What can you conclude about the relationship between the resting potential and the leak reversal potential?

Question 3: (a) What happens to the unit's activity if you change the excitatory reversal potential e_rev_e from 1 to .5? Why does this happen?

(b) Can you compensate for this by changing the value of g_bar_e? To two decimal places, use the simulator to find the value of g_bar_e that gives essentially the same activation value as the default parameters.

(c) Then use the same approach as in question 2.2 to solve for the exact value of g_bar_e that will compensate for this change in e_rev_e.

Question 4: Describe and explain the effects on the spike rate of decreasing g_bar_e to .38, and of increasing it to .42.