In the visual area of the suprasylvian sulcus (Vss) of the cat, a dual relationship does exist between light flash intensity and amplitude of the initial complex of the evoked potentials. 20 cats were investigated. Light flash intensity was varied over a range of 8 log unit intensity. In the lateral and medial layers of the Vss cortex, the amplitude is a steady increasing function of the light flash intensity, until at high intensities a plateau is reached, where the amplitude remains consistent or may decrease. This type of function is the same as that found in the primary visual areas. However, at points about the middle of the Vss cortical layers the amplitude increases very rapidly with light intensity, and the plateau is already reached within 102 times the absolute threshold intensity, which is still in the scotopic range. When the plateau is reached, the amplitude remains steady or may decrease. The amplitudes in this small area can reach very high values, over 1,200 μV, even at scotopic intensities. The latencies of the first deflection have with both the types of amplitude intensity functions the same relationship with light intensity. The possible role of Vss is discussed.