We actually feel an insight or an idea and we can see them in the brain …amazing!

A series of studies have used electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) to study the neural correlates of the “Aha! moment” and its antecedents.

Although the experience of insight is sudden and can seem disconnected from the immediately preceding thought, these studies show that insight is the culmination of a series of brain states and processes operating at different time scales.

In their fascinating book, The Eureka Factor, John Kounios and Mark Beeman explain all.

aha thoughts