While racing on the limit (which dilates subjective time), get the rider to bite on a contact switch every perceived 3 seconds. Biting would leave the hands and feet free for controlling the bike as usual. Record the bite intervals.

Repeat when riding 25% below the limit (compare lap times).
I expect the results to differ between racers, depending upon their abilities,
but to be consistent for each racer. Record the heart and breathing rates too.
My pulse goes up to 150+ and I lose a couple of pounds per race, just for the record.
Time dilates most for me when braking for a corner while leaning the bike over, even more so when sliding, and races past on the (boring) straights.

I’m sure you neuro-nerds could improve on this experiment design; go ahead, it’s just a suggestion

To relate that to the human perception of time. If we could have have existed at the dawn of the universe a lifetime of memories would have occurred during a single Planck length time interval. Time was moving exceedingly fast then.

Geometrically, one could think of it like drawing a line between two distant points. First you have to invent what seems like an arbitrary rule. To draw that line you must connect individual points between those two endpoints that have an equal distance between each point. That is, you can’t just subdivide spaces between each point with less distance between them, like rational numbers can be.

This means you must create an ever longer and more curvy line between those two endpoints as you fill the space between those two endpoints with more discrete sub points (memories). That curvy line representing perceived time will literally be longer than a straight line with no points (memories) between them.

And, by the way, shouldn’t that be “Does Time Run Slower When You’re Terrified?”

As I recall, the graduate student falling in will observe the events of the outside universe flash by, ending as s/he crosses the event horizon. These are subjectively witnessed events that can be reported (up until the very end).

Of course the reports won’t get out until well after the events have occurred in the external universe; but what can be reported back is acceleration of the rate of passage of time, as experienced by the student.

Kind of like the Blair witch project.

Go back to GR 101. If you pass “GO,” do not collect $100.00!

…and you too, Collin (12)

While SCUBA diving with a group, I was told by a novice that his partner was being carried off by the current. As that only experienced diver on the boat, with 8 people gathered on the bottom, I had to dive 75 feet down to get the group up to the boat so we could find the guy being carried away by the current while 12 miles offshore. After checking, there were no air tanks onboard with enough air to get me to the bottom to get the group to surface, then get me back up.

There was only one choice. Take the only tank with enough air to get me to the bottom and inform the group below, then depend on Boyle’s Law to expand what air was in my lungs as I rose from the 75 foot depth at a rate slow enough to prevent the bends.

I experienced the time-dilation effect, though I was not fearful. I knew the biology and physics involved and had taken the precautions I could, given the circumstances.

I suspect there is some relationship to adrenaline in the body, rather than strictly a reaction to fear. My experiences in the military tend to reinforce that view. When, in boot camp, you go “over the wall” on the night-fire course with machine-gun tracers two feet over your head, then crawl through a field with explosions going off on every side … you intellectually know you’re safe, but your adrenaline is pumping. I’d bet every Iraq Vet would tell you the same.

I’ll bet on an adrenaline effect.

http://www.radiolab.org/2010/sep/20/