Extroverts exhibit more activity in the anterior cingulate gyrus, temporal lobes, and posterior thalamus. These areas are typically thought to be more involved in sensory processing such as listening, watching, or driving. Differences in cognitive style and sensory-processing relate to characteristics associated with introversion and extroversion. True introverts are quiet, inwardly focused, and reclusive. Extroverts are gregarious, socially active, and sensation seeking.
Introverts get more of their stimulation internally, whereas extroverts seek outside sources.
These variations in brain activity suggest that a lot of our individual differences have an underlying biological cause. Previously, only the faint, fading afterglow of the event had been detected. It was the brightest burst seen so far. The amount of energy released from a gamma-ray burst boggles the mind. Exploding with the power of ten million billion suns, only collisions between objects like super-dense neutron stars and black holes have enough energy potential to create such a cataclysmic event.