Tilonians were a pale humanoid species. Some members of Tilonan society were merchants. Other members were sinister governmental officers. Some members of the military had mind-control capabilities.
Much of the scientific research done on by the Tilnoians was on the field of neurology. This also developed neurological surgeries for mind-control.
In 2369, the government collapsed. Attempts to establish order Tilonus IV was violently overthrown.
A Starfleet research team was caught on Tilonus IV. A undercover team from the Enterprise-D was sent to rescue them. Commander William T. Riker was abducted and had the neurosomatic technique used against him.
Upon the Enterprise-D leaving the planet, the situation remained the same. The social infrastructure would need several years for the society to become stable once again.