Research by Arne May et Al at the University of Regensburg in Germany found that when they gave participants -- this was actually done on adults -- a simple task to learn, like juggling, in 12 weeks, people who were asked to learn juggling displayed a marked increase in gray matter in their brain.
Penelitian Arne May dkk di Universitas Resensburg di Jerman menemukan bahwa saat mereka memberi partisipan dewasa tugas yang mudah dipelajari, seperti juggling dalam 12 minggu, orang yang disuruh belajar juggling mengalami peningkatan kecerdasan di otak mereka.