24 hours of solitude best for brain development

The Edge is one of the most interesting pages for deep thinkers. They yearly ask a question that gets answered by high regarded people from different fields. In 2006 it was: What is your most dangerous idea. I like the answer from LEO CHALUPA:

"My dangerous idea is that what's needed to attain optimal brain performance — with or without prior brain exercise — is a 24-hour period of absolute solitude. By absolute solitude I mean no verbal interactions of any kind (written or spoken, live or recorded) with another human being. I would venture that a significantly higher proportion of people reading these words have tried skydiving than experienced one day of absolute solitude."