Brain Drain

From Dragon Ball Encyclopedia

Brain Drain is a technique used by Lychee and Zarkuro on Bulma when she, Kuririn, and Son Gohan crash-landed on the wrong planet, mistaking it for the Planet Namuek. This technique lets Lychee and Zarkuro read a person's mind. While this is a potentially very useful technique, but it does have some problems because even though Lychee and Zarkuro used the technique on Bulma, who had minor knowledge of the Namuek language, they still did not know the password to open Kami's spaceship. It is possible however that during the time they probe Bulma's thoughts and the time Lychee and Zarkuro attempt to commandeer the ship, it ironically slipped their mind what the ship's controls were, or that they clumsily failed to probe these controls out of her as they believed there to be nothing unique about the craft.