An impulse too weak to initiate the nerve impulse does nothing effective; it is "subthreshold."

He had also begun to detect weak impulses but they seemed not to be getting any stronger.

-a very weak impulse somewhere far beneath him.

By reason of its vibrations, this diaphragm induces very weak electric impulses in the magnetic coil.

Even as she watched, hope building up in her, there came a weak impulse of alien thought: "Tentacle 2731 reporting-difficulty.

Both telepaths were able to detect the initially weak impulses quite plainly, even though they didn't know how to make sense out of them.

However they received only occasional weak impulses.

The weak, telepathic impulses came into Rhodan's brain: Don't shoot again.

"Once Murgut left the ship, I was able to pick up weak impulses again," the telepath stated.

He checked wiring connections, then synchronized the computer's weak impulse to the rhythm already sketched on the monitor.