at irregular intervals

A quiet Van Nuys neighborhood of manicured lawns, palm trees and single-family homes has been embroiled in a noisy squabble over a train horn that one homeowner has affixed to a tree and used to set off drawn-out blares at irregular intervals.

In their experiments, the researchers used sequences of sounds in which a different tone was heard at irregular intervals in between a series of identical ones.

At irregular intervals, the voice also tells you not to worry and warns that more flashes are coming soon.

At the Hammer, Moshayedi experimented with group exhibitions installed in open-plan galleries, sometimes including performance art scheduled to happen at irregular intervals alongside traditional paintings, sculptures, photographs and video projections.

Pictures hang at different heights and at irregular intervals.