The Human Expression was an American garage and psychedelic rock band from Los Angeles that released three well-regarded singles, and made additional demo recordings between 1966 and 1967.

[8] This being the 1960s, the original B-side of their first single, "Readin' Your Will", may have been dropped due to its being a cautionary tale about a friend who is indulging too much in illicit sex and drugs.

Their second single is an ethereal psychedelic rock number called "Optical Sound", where the singer is collecting his thoughts after a drug experience.

"[9] Following the break-up of The Human Expression, Quarles cut several demo recordings in the studio, though they were not released until collected on a 1994 retrospective album (see below).

The music of The Human Expression has been compiled by Collectables Records/Cicadelic Records on a retrospective album called Love at Psychedelic Velocity that was released in 1994.

Meantime, Martin Eshelman and Armand Poulin were in the process of establishing another band called "Rap", with guitarist Tony Foley and bass player Able Rodrigez.

A compilation album, The Human Expression & Other Psychedelic Groups, was released by the same label in 2000 and featured three of their songs (and virtually the same cover), plus additional recordings by several other bands.

Though listed as a track unique to this CD, "Your Mind Works in Reverse" is the same song and recording as "Room of Shadows" which appears on some other Human Expression compilations.