The budget is an important factor in determining which recruitment method(s) recruiters can afford to use.

Researchers are now looking for new ways to stimulate the brains of severely depressed individuals. One method, called __________, involves the use of a pulsing coil held to a person's skull at the left prefrontal cortex.

A) psychosurgery
B) deep brain stimulation
C) electroconvulsive therapy
D) transcranial magnetic stimulation