Also included in the lyrics is a term from "The Second Coming," "Spiritus Mundi" (translating to "spirit of the world"), which William Butler Yeats used to refer to the collective unconscious, another of Jung's theories.

The only way I can keep them straight is that 'Synch I' has Sting's cool sequencer part, that 'dunga dunga dung' thing that I, to this day, get all the credit for.

Robert Santelli of Relix Magazine said, "'Synchronicity I' is as close as the Police have ever flirted with musical anarchy: nothing seems to fit as each musician drains himself with relentless pokes and punches that ultimately ends in a KO.

"[5] New Musical Express writer Richard Cook described the song as "a revision of 'Message in a Bottle' dynamics to sweep aside the cobwebs of inactivity.

"[5] Adam Sweeting of Melody Maker claimed, "Indeed listening to this opening track, 'Synchronicity I', it doesn't take much of a leap of imagination to foresee the Police as a fusion group.