Neuromarketing is a field that uses neuroscience technologies like fMRI to understand consumer brain responses to advertising and brands. Two case studies are described: a Pepsi vs Coke taste test found brand knowledge influenced perceptions of taste, and viewing sports cars strongly activated reward areas of the brain. Supporters argue neuromarketing can improve ad effectiveness and product targeting, while opponents see it as a form of brainwashing that could spread degraded values and disease. The field is still emerging but may influence how commerce and ethics develop regarding commercial use of brain scanning.