Nagoya University Links Orexin Neurons to Motivation in Rats, Raising Breakpoints in PNAS Study
Updated
Updated · ScienceDaily · Aug 5
Nagoya University Links Orexin Neurons to Motivation in Rats, Raising Breakpoints in PNAS Study
1 articles · Updated · ScienceDaily · Aug 5
Summary
Nagoya University researchers found orexin neurons help rats sustain effort for food rewards, with motivation dropping when those cells were suppressed or selectively degenerated.
Progressive-ratio tests showed activated orexin neurons pushed rats to higher breakpoints, while blocking the neurons made them quit sooner and take longer to complete effortful tasks.
Real-time fiber photometry showed orexin activity rose as rewards were anticipated, stayed elevated when expected food failed to appear, and strengthened as the required work increased.
The team used newly engineered orexin-Cre rats to target the cells precisely, and reported that extra stimulation did not further boost motivation beyond normal levels.
Published in PNAS, the study points to orexin circuits as a potential route for understanding motivational deficits seen in depression, addiction and ADHD.