Example unit, showing increased orientation tuning and contrast sensitivity following BF stimulation. (a) Peri-stimulus time histogram (25 ms binning) and raster plot, showing that BF stimulation led to a robust increase in firing rate (b) A wrapped Gaussian fit to the mean firing rate for each orientation is shown. Values of the tuning width (TW) and tuning height (TH), as well as the orientation selectivity index (OSI) are shown next to the corresponding curve. BF stimulation increased TH and TW parameters while decreasing the OSI. (c) A Naka-Rushton function was fit to the contrast response data to determine the semi saturation contrast (C50 ) as a measure of contrast sensitivity. BF stimulation decreased the C50 and thus enhanced contrast sensitivity.