From: What limits performance in the amblyopic visual system: Seeing signals in noise with an amblyopic brain Journal of Vision. 2008;8(4):1. doi:10.1167/8.4.1 Figure Legend: The circles and ellipses depict bivariate Gaussian density distributions for double pass response activity. The abscissa represents the response activity for the first pass (the quantity depicted in Figure A1 above), and the ordinate is the similar activity for the second pass. The left panel is for very weak external noise, where there is minimal activity difference in the two passes. The right panel has stronger activity because it is for the case of stronger external noise. The blue, red, and black ellipses represent the noise distributions for the ideal, template, and human curves. The magenta ellipse is for the signal plus noise distribution of the human response. The vertical and horizontal dashed lines represent the criteria in our double pass, rating scale signal detection method. Date of download: 10/8/2017 The Association for Research in Vision and Ophthalmology Copyright © 2017. All rights reserved.