It got me thinking: I had the freedom to turn around any time I wanted. I felt the desire to turn around somewhere between the start and end of the street. But I ended up walking to an end of the street as marked by a street sign. It felt better, mentally, to stop at a preexisting stopping point/boundary than to do it somewhere where a point/boundary wasn’t marked out. Human tendency towards order, I suppose (aside from those of us who choose chaos). Neat little quirk of human brains.
Dopamine is the reward one.
Endorphins are stress relief, serotonin is stability, oxytocin is your mooshy feels.
Maybe it’s a similar effect to OCD, except not compulsive or a disorder, when you get stress relief from completing some arbitrary task like that.