But when an older face appears, it delivers a shock of surprise.
They delivered 150-volt shocks to the arms of 20 volunteers and asked them to rate the pain.
Every time the student gave an incorrect answer to a question, the subject was ordered to deliver a shock.
If anyone gets too close, the shield delivers a mild shock.
The one on my arm could deliver a shock.
The researchers then put the rats on a device that delivered a shock to their feet.
The big question, of course, is just how much delivering shocks to lab rats can tell us about human behavior.
Its appendages can also deliver an electrical shock in some cases.
Orlando was the first participant in the study to have required the vest to deliver a shock.
"That door delivers a paralyzing shock to any one who touches it."