Figure 4. LUM motion sensitivity for L′ and M′ drifting gratings of 4 cycle deg⁻¹ on green and orange fields.

Contrast sensitivity (○, ▵) was measured as in Fig. 2 with gratings of 4 cycle deg⁻¹. The ratio of L′ and M′ weights (▪, □– right axes) is nearly constant with increasing temporal frequency.