Okay, this started wandering around in my brain as I stared ruefully at the clock at work. How do humans sense time? It's not exactly one of the five main senses with a straightforward complex of neurons assigned to it. I think I remember something in neurobiology about a larger part of the brain having something to do with it, but that was about as precise as that class went into it. So then in some hypothetical part of the brain is there a logic function operating, like we know this is the present because it happened right after what just happened in the past? And ignoring all the readily apparent faults in that logic, what do we even recognize as the present (one second? an instant? is that based on brain chemistry as well?). Then my other question becomes, do other animals sense time differently than we do? Or do they even sense it all - or rather, is there some threshold of sentience that has to be passed, or is a timesense something that is inherent to all? Any ideas or answers, anyone out there?