What IS Activation?

Next week Luz's DBS apparatus will be "activated." What does that mean? Web MD says, "In deep brain stimulation electrodes are connected by wires to a type of pacemaker device (called an impulse generator, or IPG) implanted under the skin of the chest, below the collarbone. Once activated, the device sends continuous electrical pulses to the target areas in the brain, blocking the impulses that cause tremors."

For a more complete description, visit
http://www.webmd.com/parkinsons-disease/deep-brain-stimulation