Drosophila sugar response is increased by starvation duration and sucrose concentration in a locomotion-independent proboscis extension test.

Flies either responding to the first (water) or not responding to the last 30% to the labellum were excluded from the data analysis. The proportion of responding flies increases not only with increasing sucrose concentration but also with increasing starvation time of 21 hours compared to 14 hours. C. The response index is significantly higher after 21 hours compared to 14 hours of starvation indicated by asterisk (Wilcoxon rank sum test, p < 0.05) and was calculated by summing the positive proboscis extension responses to all the seven stimulations and are illustrated as medians (bar), the 75%- and 25%-quartiles (box) and the total data range (whiskers).

Numbers inside the boxes indicate sample sizes.