Audio-visual suggestion
Audio-visual suggestion was a suggestion that was made through audio-visual means.

When the male crewmembers of the  were under the spell of the female inhabitants of the second planet of the Taurean system in 2269, the ship received a subspace radio signal from the planet sent by an opto-aud. 

To Spock, it was identified as the sound of a Vulcan marriage drum, followed by an audio-visual suggestion of the female who was playing it. ()

Psychology
Communication