Supplementary Material Information Geometry of the Retinal Representation Manifold Xuehao Ding 1, Joshua B. Melander

A video monitor projected visual stimuli at 30 Hz controlled by Matlab (Mathworks), using Psychophysics Toolbox [1, 2]. Stimuli had a constant mean intensity of 8.3 mW/m We presented a natural scene stimulus that was a sequence of jittered images sampled from a natural image database [3]. The responses of tiger salamander retinal ganglion cells from 5 animals were recorded using a 60 channel multielectrode array. Further experimental details are described in Ref. [4]. Spiking responses were binned using 10 ms bins and for the training set the responses were further smoothed using a 10 ms Gaussian filter.