Cain cites physiological research showing that when people (not just introverts) oppose group consensus, their brains' amygdalae "light up"—signaling fear of rejection—thus discouraging potentially valuable individual contributions to the group.
Cain mengutip penelitian fisiologi yang menunjukkan bahwa ketika seseorang (tidak hanya introver) menentang konsensus kelompok, amigdala otak mereka "menyala"—menandakan takut ditolak—sehingga mengecilkan nilai kontribusi individu yang potensial bagi kelompok.