For there are such things as psychic probes, and here we have four Foundation brains.

He didn't need to use a psychic probe to know who was on the other side of the door.

He opened his mind, sent out a tentative psychic probe.

He said, "This man has been treated with a psychic probe.

Isn't it obvious to you that he has been under the psychic probe?

I found it difficult to control him and eventually had to use a psychic probe.

She defends herself from the psychic probe and literally calls the police.

It had been her bad luck to be in the vicinity when the psychic probe struck.

But she was not responding to his psychic probe.

Subject each one to a psychic probe and find out which of the two is lying.