Fig 2.

A) Averaged light spectra for the unfiltered light source (blue dashed line, no filter), light through uncoated filter (control sample, blue line), under transmissive (grey line) and absorptive (black line) states. For unfiltered light and the uncoated control filter, just one measurement was performed, while for ECFs, 11 filters were measured under both states. Orange vertical lines for transmissive and absorptive states indicate standard error of the mean (SEM). B) Images of pulse light as the user perceived them with the filter in transmissive and absorptive states. Estimated RGB values: transmissive (188,192,188), colored (219, 210, 102). C) Filters binocularly implemented in a commercial virtual reality case that participants wore for color naming tests. In the photograph, left filter is in the transmissive state and right filter is in the absorptive state. During actual experiments, both ECFs were in the same state.