Visual pursuit errors: implications for network models

摘要

. Therefore, significant variability is introducedearlier, at the time of visual transduction itself, early visualprocessing stages, or the sensorimotor transformation. Velocity is notsensed directly, but rather requires observation of a change over time.Thus, early estimates of velocity may be poor because the denominator isso small. The authors show velocity measurements 60 ms into the eyeresponse, an average of 180±18 ms after target motion initiation.The orientation of the error ellipse with major axis in the direction ofmotion suggests that, although speed is poorly estimated at first,direction is better resolved