 The "Mawdryn Undead" storyline establishes that the younger version of the character involved in the discharge, Brigadier Lethbridge-Stewart, is traumatized by the event and, for the next several years, loses his memory of the Doctor.It is possible, however, as Lawrence Miles and Tat Wood theorise in their reference book "About Time 5", that the energy discharge is simply a side effect of the Effect's operation.It also appears, given the number of times that the Doctor has met his other incarnations, that the Effect does not apply to Time Lords or, at the very least, can be mitigated.