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The effect of training on choice performance for selecting one of the four celebrity faces. At all training stages, S+ is one of the celebrity faces shown. S− was a black screen (Training 1) an object (Training 2) or an unfamiliar face (Training 3). Data are shown as the mean ± s.e.m. Where error bars are not visible, they are obscured by the symbols. Chance (50%) is shown as a dashed line.
