I was cleaning up a concentrated formic acid spill and when I was close enough to the hood to get a whiff it smelled exactly like the smell sensation from hitting my head.
We know that olfactory memory is very keen. While many people identify a vaguely metallic odor when hit in the head, I doubt many non-chemists have had occasion to smell pure formic acid. Do chemists familiar with the chemical generally agree that formic acid matches the olfactory sensation of head concussion?
If so: Is there a physiological effect of head concussion that would mimic the effects of formic acid vapor on the olfactory system? (Or maybe even produce formic acid that could be picked up by olfactory nerves?)