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Lighting Research and Technology
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Mesopic visual efficiency II: reaction time experiments

H. Walkey, PhD

Applied Vision Research Centre, Henry Wellcome Laboratories for Vision Sciences, City University, London, UK, h.walkey{at}imperial.ac.uk

P. Orreveteläinen, DSc

Lighting Laboratory, Helsinki University of Technology, Helsinki, Finland

J. Barbur, Ph.D

Applied Vision Research Centre, Henry Wellcome Laboratories for Vision Sciences, City University, London, UK

L. Halonen, D.Sc

Lighting Laboratory, Helsinki University of Technology, Helsinki, Finland

T. Goodman, BSc

National Physical Laboratory, Teddington, UK

J. Alferdinck, BSc

TNO Human Factors, Soesterberg, The Netherlands

A. Freiding, Dipl-Ing

Laboratory of Lighting Technology, Darmstadt University of Technology, Darmstadt, Germany

A. Szalmás, MSc

Virtual Environment and Imaging Technologies Laboratory, Pannon University, Hungary

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 ({lambda}). Reaction time spectral sensitivity for peripheral stimuli exhibits a Purkinje shift, and approaches V ' ({lambda}) 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.

Lighting Research and Technology, Vol. 39, No. 4, 335-354 (2007)
DOI: 10.1177/1477153507080920
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