MiscQ&A: Daniel J. Siegel, neuropsychiatrist, on the power and purpose of the teenage brain Q&A: Daniel J. Siegel, neuropsychiatrist, on the power and purpose of the teenage brain Spiegel unravels the courage and creativity of adolescents — and reveals that teens are both impulsive and hyper-rational. This was posted on Google+ Share:Click to share on Google+ (Opens in new window)Click to share on Twitter (Opens in new window)Share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Standard