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1. It was shown that the potentials evoked by using a grating pattern alternated in phase at 8 Hz is proportional to the logarithm of the supra-threshold contrast. Other functions were considered, but they did not describe the data so parsimoniously.

2. The same logarithmic function described the results when a grating was simply flashed on and off; therefore, the apparent movement accompanying the phase alternations is not necessary to evoke the potential.

3. The contrast at which the evoked potential reached the theoretically zero voltage (C₀) was compared with the psychophysical contrast threshold, determined by means of proportion-of-time seen measurements; the C₀ contrast corresponded to 50% time seen.

4. The potential, corrected for the proportion-of-time seen, was found linearly related to contrast.

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