Fig. 3.
Raster plots (I) and spike density functions (II) representing the activity of 2 example GC neurons in response to citric acid/sucrose (A) and NaCl/sucrose (B) mixtures. Shown are the responses to 100% citric acid or NaCl (blue), 100% sucrose (red), and the 50/50% mixture (pink). Horizontal green and magenta bars in II indicate time periods of significant (P < 0.05) fit to the monotonic and mixture patterns, respectively. Spike times in II were convolved with a Gaussian kernel (SD = 50 ms) for display purposes. Panels III and IV show the responses (colored squares) to the complete array of taste mixtures averaged over periods of significant monotonic and mixture fit, respectively. Dashed lines in IV indicate linear fits to the data. Note that the mixture pattern was quantified by a single linear fit to the data ordered by degree of mixture but is visualized by plotting neural responses ordered by citric acid/sucrose ratio and plotting the fit as 2 mirror images of the original (single) linear fit.