Fig 6. LiCl-conditioned avoidance of DB (n = 6), QHCl (n = 7), CAF (n = 7), SAL (n = 8), and EGCG (n = 6) in two-bottle choice tests after a 3-week period of exposure to the same bitter compound (open circles) superimposed on those measured without the exposure period (closed circles).

# and * indicate the lowest concentrations at which preference ratios fell significantly (p < 0.05) below indifference (0.5) before and after the long bitter exposure, respectively. Solid and dashed lines represent curves fit to the average ratios for the NE and E groups, respectively. Gray lines represent the indifference level (0.5).