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Abstract

Reaction times were recorded to chromatic, mesopic stimuli to investigate mesopic reaction time spectral sensitivity. Measurements were made using three laboratory set-ups and a driving simulator. The chromatic stimuli had spectral distributions that ranged from quasi-monochromatic to broadband. Reaction time spectral sensitivity for small (0.29o) foveal stimuli changed little with luminance and was described adequately by V(l). Reaction time spectral sensitivity for peripheral stimuli exhibited a Purkinje shift, and approached V'(lambda) at 0.01 cd m-2. In the periphery, the results for medium-sized stimuli (2o) reflected the activity of colour-opponent neurons in addition to rod and cone-based achromatic activity, resulting in three-peaked spectral sensitivity functions.

Item Type:	Article
Keywords:	mesopic vision, reaction time, mesopic photometry, spectral sensitivity, spectral luminous efficiency, night-time driving, mesopic visual performance, colour vision
Subjects:	Optical Radiation and Photonics Optical Radiation and Photonics > Materials and Appearance
Last Modified:	02 Feb 2018 13:15
URI:	http://eprintspublications.npl.co.uk/id/eprint/4061

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