Pheromones or sound may also play a part but supporting evidence has not been found so far.

In addition to the brief effects on the subject's face as noted above, there are distinct sounds played throughout the flash.

Through the thin walls comes the sound of techno played too loudly.

It was like the sound of some vocal record, played too fast on a phonograph.

You can freeze the picture while the sound plays in the background.

Its sounds like I'm playing in the band, he said.

A constant sound had played at the edges of his consciousness.

There were lights in the house windows, and the sound of a sound system playing rap.

The sound and the way his friend played captured him.

Waxy smiled as he let the vision and the sounds play in his mind.