AbstractIn recent years a number of electrophysiological and psychophysical observations have suggested that the temporal properties of the human longwave‐ and middlewave‐sensitive cones might be different. However, until now the issue has remained unresolved, despite its obvious importance. We have succeeded in probing, electrophysiologically, the temporal properties of the two classes, under a range of adapting conditions, in a normal human observer. Here we present evidence that the temporal properties of these cone types are indeed different and that this difference is constant irrespective of the state of light adaptation, suggesting that light adaptation has little effect on the kinetics of transduction in human co
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