The greenbelt is for uglies to act out their random impulses.

My hunch is that the social cohesion of the group, added to conscientiousness about visiting major attractions, would overwhelm random impulse.

For that matter, was there any way of discovering the intentions of a person whose flow of speech seemed to be triggered by random impulses?

Enmity to a Med Ship is something more than a random impulse.

His whole life had been at the mercy of a random impulse "in the micromaze of a moth's brain."

Even her random impulses, to which Webster had become accustomed, seem opaque.

When no sound is coming from the ears, the brain may still generate occasional, random impulses that the music-processing regions interpret as sound.

Some random impulse drove him out of the house.

The walls of the Situation Room were lined with chips that generated random electrical impulses or impedence webs.

I just wondered why I sometimes suffered these sudden, random impulses, some of which were extremely difficult to resist.