An anonymous reader writes: Sam Barnett "has been strapping electrode caps on focus group participants and showing them primary season debates," reports CNN, and there's one clear conclusion. "Seeing Trumps face, hearing Trump's voice, lights up the brain." His data captured big surges in neural activity for hot-button topics like immigration, and revealed that while Marco Rubio actually triggered slightly more brain activity among men, Trump clearly produced the highest reactions among women and overall. "The focus group participants might have been excited by Trump. Or they might have been repulsed," reports CNN. "But one thing was for sure: they weren't bored." Barnett has also used electroencephalography (or EEG) to study advertising, and in the future he hopes to also apply it to other complex forms of brain stimulation like movies and even hedge-fund investing.