Rule of 7 (marketing touches)

Biological Parallel

Alarm calls in prairie dog colonies must be repeated 5-7 times before the colony responds—a single call gets ignored as potential noise, but repeated signals overcome the threshold for collective action. Neural pathways require repeated activation (typically 6-8 exposures) to move information from short-term to long-term memory through hippocampal consolidation. Repetition isn't about wearing down resistance; it's about crossing the biochemical threshold for pattern recognition and memory formation.