Fig. 25

The average response profiles of the S-cluster. Error bars are SE. Striped columns indicate salts; dark grey columns, umami compounds; open columns, acids; grey columns, bitter compounds; and black columns, sweeteners. Numbers within brackets show number of fibers tested with each compound. The plot shows that chimpanzee S fibers are tuned to sweet because there was hardly any response to the non-sweeteners. [56]