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We analyzed different contrast metrics to scale the stimulus strength for suprathreshold reaction times when it is modulated along an achromatic channel (L+M) and both chromatic channels L/M and S/(L+M) considering increments and decrements along these axes. Reaction times were examined as a function of the Weber luminance contrast; spatial luminance ratio and, in terms of threshold units.The results show that when there is only luminance decreasing or increasing no such asymmetry between the two is observed and our results indicate that both spatial luminance ratio, Weber luminance contrast or threshold units equate RT values. While,if the stimulus is modulated along an isoluminant plane the appropriate contrast is Weber (RMS) or SRL for stimuli modulated along L/M axis and for stimuli modulated along S/L+M, showing an asymmetry between S-cone decrements and increments in L/M cone pathway. Threshold units are not appropriate, showing inconsistencies: the stimulus with chromatic direction equal to 90° appears as the most informative with a maximum gain. Even more so, the shared contrast gain grows as the size of the stimulus decreases. Aceptacion del articuloFrom: Jean-Pierre Jeannet Date: 2016-02-21 14:27 GMT-03:00Subject: Submitting publication material: Manuscript 8148 KRGTo: bodonell@herrera.unt.edu.arDear Beatriz Maria ODonellWe are informed that your paperThe appropriateness of contrast metric for reaction timeshas now been accepted for publication in Perception. Congratulations!Next, you will need to prepare and submit your final production materials within the next FIVE days (via PiMMS) to us at Pion Ltd, where your paper will be processed. Please note that at this stage we require separate hi-res (300 dpi) files for all figures in your paper (EPS, TIF, and PDF files only are accepted), along with a final version of the manuscript, formatted as per the style of Perception. Please also embed low-res figures within the manuscript, so that we can see where you would ideally like these placed. Please note, even if your paper does not contain any figures, we still require you to complete this stage.At the same time, if you previously indicated that your paper may be of interest to the general public, you will need to provide contact details for your University Press Office.Please click on the quick link below and follow the instructions to submit.http://submission.perceptionweb.com/mms/gopage.phtml?page=3dc8686230a34ea875bdb47e8251f2a7Best regards,Pion Ltd, publishers of Perception and i-Perception.PiMMS (Pion Manuscript Management System)-----------------------------------------------------------InstructionsPlease view the author guidelines at http://submission.perceptionweb.com/supplement/instructions/pr/authors.htmlIf you have any questions,please contact Gillian Porter at the editorial office, gillian.porter@bristol.ac.uk.