Fig. 7.

Models for optokinetic reflex (OKR) vergence eye movement. A: binocular sensory integration model. The first model illustrates a vergence mechanism in which sensory signals (red and blue) are first integrated and motor signals (black) are generated following that integration. B: oculomotor combination model. The second model illustrates a mechanism in which vergence eye movement is generated by combination of motor signals from the two eyes. The visual signals drive asymmetric motor signals (purple), which are then summed to generate the vergence eye movement (black). Red: leftward motion in right eye; blue: rightward motion in left eye. The motor signal from the two eyes are combined to generate vergence eye movement (black).