Down-regulation of a cytokine secreted from peripheral fat bodies improves visual attention while reducing sleep in Drosophila

动物的行为决策取决于自身状态（internal states），外部刺激（external stimuli），和过往的经验（prior experience）。睡眠和摄食两种行为对应的自身状态是睡眠充足/困，饱和饿。这两种自身的状态都是内稳态的过程。对于生存同等且至关重要。然而，睡眠和摄食这两种行为相互排斥。

DART用于果蝇摄食的应用

判读果蝇摄食行为的4个标准：

(1) it was located at the food,

(2) its speed at the food was less than 1 mm/second， (3) it remained at the food for at least 30 seconds,

(4) it was not sleeping (i.e., immobile).