in the second step for robotic arm to work the monkey learned to move

a) a feedback loop
b) its own arm
c) its head
d) a stick

to learn about the relation between the cursor movements and robotic instrument the monkey needed to

a) master a neuroprothetic limb
b) practice for a few days
c) see itself on the screen
d) remove the joystick

at the end of the experiment the monkey learned to control the robotic arm using its own

a) arm
b) brain
c) joystick
d) initiative