Fig. 16 Model of binocular fusion and diplopia considered from the point of view of three classes of cortical neuronal receptive field with similar visual directions–monocular left eye (ML), monocular right eye (MR), and binocular corresponding (BC). Stimulus inputs to these receptive fields are shown as full (left eye) and dashed (right eye) lines for zero, small, and large binocular disparities. Third line shows individual and combined visual direction codes for the three types of neurons.