Neuroscience techniques like EEG, fMRI and eye tracking can provide insights into unconscious consumer decision making. Marketers have used these methods to understand how consumers perceive brands, slogans and advertisements. For example, Coca Cola research found brand image influenced taste preference more than actual taste. However, some argue neuromarketing could allow manipulation of consumer desires and be misused for propaganda. Overall, it provides useful research tools but also controversies around ethics and potential negative impacts.