Overgaard and His Colleagues (2004) Used Transcranial Magnetic Stimulation (TMS)

Overgaard and his colleagues (2004) used transcranial magnetic stimulation (TMS) by placing a magnetic wand over an area of the skull corresponding to an area of the visual cortex. This disrupted activation in that area and caused participants to temporarily lose awareness of a visual stimulus. An advantage of TMS over other methods is that it allows researchers to:

A) monitor brain activity in a specific area of the brain.
B) control other influences (extraneous variables) that could affect brain activity.
C) experimentally manipulate the brain from outside of the skull.
D) examine multiple variables in the living brain at the same time.