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Koko Signs 'Brush'
In this footage we see Koko ages 1 to 29 years old as she learns and uses the sign “Brush/Comb”. From the earliest stages of development as a baby, to mastering the sign independently, Koko's journey with the sign for 'Brush' exemplifies the power of motivation in learning. Grooming proved to be a compelling incentive for Koko's linguistic development.
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