Telepathic communication, otherwise known as mind reading, is also known to the Colonials. Following the exodus from the Colonies, the human survivors happen across Count Iblis, who uses his power to acquire information and reinforce his will upon those who freely give themselves to him.
Xam, an engineer aboard Galactica, is struck by void lightning generated by an unnamed storm zone. This strike unlocks his latent psionic potential, elevating him to a delta-class telepath: provisioning the ability to project ideas and beliefs into the minds of others, including non-organic life such as the Cylons.
A deleterious effect to psionic use, particularly in extreme circumstances, leads to mental damage of the user. In Xam's case, use of his psionic powers to fool the Cylons during the Battle of the Storm Zone results in his death (Classic Battlestar Galactica Vol. 2 #11).