Neuromarketing uses techniques like fMRI and eye tracking to understand unconscious consumer decision making. It has found that over 50% of purchasing decisions are made spontaneously, and advertising can influence brain regions involved in reward and risk assessment. Studies show order of presentation, emotions like fear and disgust, ambient scents, and subliminal cues can sway choices, even without a person's conscious awareness. While controversial, neuromarketing aims to provide insights into effective marketing strategies.