Stages of Smooth Pursuit
Pursuit eye movement can be divided into two stages: open loop pursuit and closed loop pursuit. Open loop pursuit is the visual system's first response to a moving object we want to track and typically lasts ~100 ms. Meaning that this stage is ballistic: visual signals have not yet had time to correct the ongoing pursuit velocity or direction. The second stage of pursuit is called closed-loop pursuit. This stage lasts from 100 ms after the initiation of pursuit until the pursuit movement has ceased. This stage is characterized by the online correction of pursuit velocity to compensate for retinal slip. In other words, the pursuit system tries to null retinal velocity of the object of interest. This is achieved at the end of the open-loop phase. Pursuit gain in the closed-loop phase, i.e. the ratio of eye angular velocity and target angular velocity, is near to 1.
Read more about this topic: Smooth Pursuit
Famous quotes containing the words stages of, stages, smooth and/or pursuit:
“America is a country that seems forever to be toddler or teenager, at those two stages of human development characterized by conflict between autonomy and security.”
—Anna Quindlen (b. 1952)
“America is a country that seems forever to be toddler or teenager, at those two stages of human development characterized by conflict between autonomy and security.”
—Anna Quindlen (b. 1952)
“Success can make you go one of two ways. It can make you a prima donna, or it can smooth the edges, take away the insecurities, let the nice things come out.”
—Barbara Walters (b. 1931)
“We must not suppose that, because a man is a rational animal, he will, therefore, always act rationally; or, because he has such or such a predominant passion, that he will act invariably and consequentially in pursuit of it. No, we are complicated machines; and though we have one main spring that gives motion to the whole, we have an infinity of little wheels, which, in their turns, retard, precipitate, and sometime stop that motion.”
—Philip Dormer Stanhope, 4th Earl Chesterfield (1694–1773)