"Just like us humans, learning to drive and navigate seemed to have a relaxing effect on the rats. In a control experiment, they found rats had higher levels of cortisol when being driven around in remote-controlled cars than when they were allowed to steer themselves."

From the futurism post https://futurism.com/the-byte/scientists-rats-drive-tiny-car...

Seems like a terrible control imo for me to say driving intrinsically has a relaxing effect. A better control would be rats doing nothing vs rats driving and seeing if the rats doing nothing were more stressed than the driving rats, meaning the driving rats were actually lowering their baseline stress.

In this experiment the control of being a passenger in a terrifying vehicle moving all by itself with no autonomy or control over the situation can quite likely be the thing causing elevated stress, rather than rats driving depressing levels of stress. Imagine if someone suddenly strapped you into a bubble that started moving by itself and you have no idea why this is happening, no control over the situation, or where you're going or what's going to happen to you. Stressful af. Hell, people get stressed just being in the passenger seat watching someone else drive.

The vast majority of people prefer having autonomy and control over their own motion vs being helplessly navigated by someone else you don't know/trust with zero context and no idea what's going on. A little misleading if this reflects the actual study.