Stare-in-the-crowd effect evolved from a necessity for fast and accurate gaze perception for complex social interactions (Emery 2000). According to this model, an eye direction detector (EDD) mechanism - a neurocognitive system responsible for the rapid detection of eyes in the environment and their gaze direction – arose as a function of the geometry created by a dark circular iris relative to the white sclera (Baron-Cohen 1994). Specifically, it is contended that the increased ratio of exposed sclera in the eye outline of humans serves to enhance the velocity and acuity of gaze direction perception (Kobayashi and Kohshima 2001). Baron-Cohen, S. (1994)
The Eye Tribe visual angle and can identify and follow the movement of an eye with sub millimeter precision, which is around the size of a fingertip. The Eye Tribe Company is developing their eye tracking device in hopes that sometime in the near future many products, such as smart phones, tablets, and computers, will carry Eye Tribe’s software. The company’s goal is for their eye tracking technology to become a household item and a common feature on most devices. From their demos, The Eye Tribe makes it clear that they hope their technology will become versatile, used for many things from games