Figure 1. Spatial frequency properties of all cells recorded in area 19.

Representative examples of spatial frequency tuning functions of the dominant eye for two complex cells (A and B). The stimuli used to derive the spatial frequency tuning functions were sinusoidal gratings (contrast: 30 %) flickered at a temporal frequency of 2 Hz (A) and 4 Hz (B). The distribution of the optimal spatial frequency (C) for the dominant eye of 62 cells shows that most units are sensitive to low spatial frequencies (mean = 0.18 cycles deg⁻¹). The spatial bandwidth distribution (D) of the dominant eye reveals that the cells are highly selective to static spatial frequency gratings (mean = 1.6 octaves).