Meet Orexin, The Brain Chemical Behind Staying Motivated

A Nagoya University-led PNAS study finds that orexin neurons in rats help turn expected food rewards into sustained effort.

Activating hypothalamic orexin neurons made rats work harder for food, while inhibiting them reduced persistence.

The neurons became active before expected rewards and remained elevated when rewards failed to appear, highlighting a role in reward prediction and motivation.

The findings may guide future research on low motivation in conditions such as depression and addiction.