In the gameplay we also see that the tadpole psychic power is a Wisdom-based roll that tried to force a creature to do your bidding.
So characters that have already high persuasion, intimidate or deception and high charisma (Those skills are CHA-based) could do better with the skills if they do not have positive modifiers in the wisdom stat. In most of the situations where Sven used the tadpole you also have the -persuade- option.
Sounds like the "force persuade" of KOTOR games, a way for low-skill or low charisma characters to be able to persuade in dialogues, for a prize (in KOTOR you usually earn dark side points).
