Figure 2From: Heritable differences in chemosensory ability among humansRatings of bitterness on a 7.5-cm visual analog scale. Subjects rated raw, chopped vegetables for their bitterness. The y-axis is the average rating of bitterness for each vegetable and the x-axis is the variation between subjects as measured by standard deviation. The more bitter the vegetable tasted on average, the more variable the bitterness ratings (r = 0.497).Back to article page