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A team of researchers at Shizuoka University is hitching a ride on Japan’s bullet train technology, aiming to transmit targeted advertising at high speeds.

Using a groundbreaking technique called high-speed suggestive particle mapping (HS-SPAM), the system relies on embedded arrays of microscopic LEDs that flash subliminal messages. The initial tests, conducted in 2015, confirmed that images could be effectively transmitted and recognized by viewers.

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