Neuromarketing uses techniques like eye tracking, EEG scans, and fMRI to measure neurological and physiological indicators when consumers are exposed to marketing stimuli. This reveals hidden preferences that traditional surveys cannot access. Some techniques measure attention, emotional response, and activation of brain regions related to reward and decision-making. Early adopters include PepsiCo, Daimler Chrysler, and Jack Daniels, but high costs and ethical concerns may limit widespread adoption. Overall, neuromarketing aims to uncover subconscious consumer preferences to create more effective marketing.