[@Sophrus], the Zerg, at least, higher minds than the simpletons at the bottom, are capable of Telepathy. It's one of the main ways that they communicate among themselves, as well as one of the ways that they can communicate to Terrans and other races. If it's to be believed, if enough will is put into it, this can translate into audio/video transmissions (such as how Kerrigan communicated with the Hyperion). Probably will be easier to psychically communicate with the Ghosts aboard your ship, too.