fORP TTL Trigger Output Cable. fORP is a collection of interchangable, MR Safe fiber optic response pads and other type of input devices. It is the most comprehensive solution for measuring subject responses in the MR environment. The system is robust, dependable, offers universal software support and is based on over 10 years of continual development. Best of all there is no metal and nothing electronic in the MR room, so you never need to worry that the system will add noise to your images, or raise safety concerns.