Which scientifically-proven neuromarketing technique has been documented to increase luxury product sales by up to 18% in high-end retail environments?

Neuromarketing combines neuroscience with marketing to understand consumer behavior at a subconscious level. Major brands invest millions in this research to optimize product design, packaging, and advertising. This poll tests your knowledge of how retailers leverage brain science to influence purchasing decisions - a critical understanding for anyone in business strategy, marketing, or economics. Can you identify the scientifically-backed technique that major retailers are using to drive sales?

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Strategic pricing using the 'charm price' effect (prices ending in 9 or 7)
Artificially increasing store temperature by 3-4°F to accelerate decision-making
Using haptic sensations (weight and texture) to increase perceived product value and quality
Implementing dynamic background music that synchronizes with shoppers' walking pace