Called "Force Trainer" it is named after "the Force" powers of Yoda and Luke Skywalker in the popular Star Wars films.

它的名字叫“Force Trainer”，得名于广受欢迎的星球大战电影里和尤达和卢克·天行者的“The Force”力量。

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Two headset-based toys released in 2009 Uncle Milton's Star Wars Force Trainer and Mattel's Mindflex used players' concentration and relaxation levels, gauged by comparing brain waves of different frequencies, to make a ball rise or fall using airflow from a fan.

ECONOMIST: Brainwave controllers