Hoister Tetrad Mindlink
The mindlink between members of the same tetrad is still unexplained, despite all investigation and at least twelve papers in prestigious journals. It isn’t standard telepathy, nor a physical phenomenon like ultrasound or pheromones. The mindlink works as easily across kiloparsecs as meters. The best guess from psi-experts is that the mindlink is akin to the pseudo-telepathy sometimes demonstrated by identical twins.
However, the mindlink is much deeper than mere telepathy. Members of a tetrad don’t just share thoughts…they share emotions, sensations, memories, imagination, dreams. It is said that each tetrad is one mind in four bodies.