Which retail neuromarketing technique has been proven most effective at increasing average transaction value in grocery stores?

Neuromarketing combines psychology, neuroscience, and marketing to influence consumer behavior at a subconscious level. Retailers are increasingly using these sophisticated techniques to drive sales without consumers even realizing it. This poll tests your knowledge of cutting-edge neuromarketing tactics employed in modern retail environments that affect purchasing decisions without shoppers' conscious awareness.

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Playing slower tempo music (under 70 BPM) to encourage customers to move more slowly through store aisles
Placing essential items at the back of stores to maximize exposure to promotional products
Using red price tags to create a sense of urgency and immediate purchase motivation
Implementing facial recognition to customize digital displays based on customer demographics