Your are particularly (some might say unnaturally) sensitive to your surroundings.
Benefit
You gain a +2 mutation bonus on Perception checks. You also gain Blind-Fight as a bonus feat.
Modern System Reference Document © 2002, Wizards of the Coast, Inc.; Authors Bill Slavicsek, Jeff Grubb, Rich Redman, Charles Ryan, based on material by Jonathan Tweet, Monte Cook, Skip Williams, Richard Baker,Peter Adkison, Bruce R. Cordell, John Tynes, Andy Collins, and JD Wiker.