You foul up the targets' subconscious sensory system, overloading vision, hearing, feeling, and other more esoteric sensory systems, including vibration sensitivity, thermal sensing, and others—in effect, the cascade buries the senses of the target creatures (even those with blindsight, tremorsense, touchsight, or other esoteric methods of sensing the environment) with randomly firing neurons for the duration. The creatures are treated as if blinded (see the “Blinded” condition summary in the Player's Handbook). However, from round to round, an affected creature has a chance to sense normally. Each round on the creature's action, roll 1d4. Unless you roll a 4, the target does nothing for 1 round as it stands attempting to re-establish contact with its senses. Rolling a 4 frees the creature of the effect for 1 round.
Sense-blocked creatures that are attacked (and damaged) are shocked out of their sense deprivation for 1 round by the tissue damage—they can attack or attempt to flee however they desire on their next action. The following round they are subject once again to the sensorineural cascade (unless they are continually attacked each round).
If you spend an additional 4 power points, the condition lasts 24 hours. If you spend an additional 6 power points, the condition is permanent.