In order to study parts of an animal's brain, researchers may sometimes deliberately damage a part of the brain. They accomplish this by placing into the brain a thin insulated wire through which they send an electrical current that destroys the brain cells at the tip of the wire. This technique is called ____________.

A) lesioning
B) ESB
C) EEG
D) CT scan

The technique described in the question is called lesioning, which involves deliberately damaging a part of the brain to study its functions. ESB (electrical stimulation of the brain) involves sending a small electrical current through specific parts of the brain to stimulate activity, while EEG (electroencephalogram) and CT scans are non-invasive techniques used to study brain activity and structure, respectively.