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[Phys-L] Variations in People’s Sense of Direction

Hi Phys-L ‘ers,

No one responded last week when I suggested, in the context of the discussion about sharks’ sense of direction, that the variability in people’s sense of direction might be due to differing amounts of iron in their bodies.

Ok, here is another of my quarter-baked theories:

1. I have no sense of direction - once I make one 90 degree turn I am lost.

2. My son just informed me that his mother, a concert pianist, who did little other than practice on grand pianos since the age of four, had an extraordinary sense of direction.

3. Let’s think about it:
a. Her being stationary and in the same position relative to the grand piano for tens of thousands of hours.
b. The local earth’s magnetic field lines being guided, all in the same direction, by the piano’s 200 or so steel strings and tending to pass thru the pianist all in the same direction.
c. The piano(s) were positioned in the same orientation for decades. (Not 100% sure of this)(Sometimes she did two-piano work, where the strings in one piano were parallel to the strings in the other piano.
d. So, if she had any iron in her body, and we all do, that iron would experience torque from the earth’s magnetic field lines.
e. The vibrating of the strings as she played would have caused a shaking in the magnetic field lines which would have shaken the iron particles in her body so that they would more readily “fall into place.”
f. Did I get most of that right?


Bill Norwood
Retired Sep 2018
Physics Dept
U of MD at College Park

Sent from my iPhone