I have been led to believe by expert testimonies that juggling may lead to an increase in brain depth and size.
At the moment I am not able to draw on much evidence.
If this is a myth, I would appreciate clarification, thank you.
"A new study published in the journal Nature finds that learning to juggle may cause certain areas of your brain to grow."
Prior to conducting the tests, the subjects were scanned, measuring the size of their brains. After, the researchers told half of the subjects to teach themselves the 3-ball cascade variation of juggling for atleast 60 seconds. The subjects were also given three months of practicing time. The other half did nothing. After the period had passed, the researchers took scans of the 24 people again. The 12 people who did not juggle had no brain mass changes, but the 12 who learned to juggle showed an increase in brain matter.
Source: Benefits of Juggling, Yahoo
Also, a study published by PLoS one Science Journal (July 2008) suggests that juggling may alter gray matter in the occipito-temporal cortex as early as after seven days of training.
Here is a link to the study for those of you that may be interested: http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0002669