To gure out how the brain stamps a behavior as one to make a habit, the M.I.T. lab began recording the electrical activity of small collections of neurons (brain cells) in the striatum.
A.
fixes a postage stamp on to (a letter)
B.
makes something by cutting it out with a die or mould
C.
brings down (one’s foot) heavily on the ground
D.
impresses a mark on a surface using an engraved or inked block or die or other instrument