I just went and did a quick experiment. I went out and stared at the sun for half an hour until it set behind the horizon. I was recording my galvanic skin response and drawing a graph with processing.
The measurements are very scattered, picking up and down… There is a quieter pattern in the middle, when I was on the phone, and it goes disperse again towards the end when I go back to the staring. Then came in a took some more readings. Pattern is much more regular.
It is impossible and definitely not my intention to make assumptions regarding the meaning of these. A human body is a very complex system and its oscillations are not direct effects of clear causes but rather aggregations of hundreds of quasi-causes. Yet how cool would it be to see our interactions with other bodies expressing at the level of bodily potentials, leaving traces in the form of microchanges.