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. Author manuscript; available in PMC: 2015 Jan 8.
Published in final edited form as: Neuron. 2014 Jan 8;81(1):130–139. doi: 10.1016/j.neuron.2013.10.043

Figure 2. Ganglion cell responses to single cone stimulation.

Figure 2

Three of the numerically dominant RGC types responded robustly to single cone stimulation. In each high resolution receptive field map, two stimulus regions are indicated by black polygonal outlines, with each region selected to activate a single cone in isolation. Scale bars 15 μm. Responses to stimulation of each region separately are plotted below as rasters over 40–50 trials (rows of grey dots) and peristimulus time histograms (black traces). For each RGC, the left raster plot corresponds to the leftmost stimulus region. The stimulus was a contrast step 0–250 ms (indicated above response plot). For the OFF cells, the stimulus was a 96% contrast decrement and for the ON cells it was an increment. Discriminability indices, d′ (see Experimental Procedures), for single-trial responses to stimulation of the stronger (leftmost) stimulus region in each RGC were 6.9 and 5.5 for the top and bottom OFF midgets respectively; 2.9 and 5.3 for the OFF parasols; and 2.6 and 3.9 for the ON midgets.

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