Reaction times are recorded to chromatic, mesopic stimuli to investigate mesopic reaction time spectral sensitivity. Measurements are made using three laboratory setups and a driving simulator. The chromatic stimuli have spectral distributions that range from quasi-monochromatic to broadband. Reaction time spectral sensitivity for small (0.29°) foveal stimuli changes little with luminance and is described adequately by V (λ). Reaction time spectral sensitivity for peripheral stimuli exhibits a Purkinje shift, and approaches V ' (λ) at 0.01 cd m-2. In the periphery, the results for medium-sized stimuli (2°) reflect the activity of colour-opponent neurons in addition to rod and cone-based achromatic activity, resulting in three-peaked spectral sensitivity functions.
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