That's quite a lot of dependent variables for such a low N, skeptical. Also claims like these require extraordinary evidence: It has now been established [

That's quite a lot of dependent variables for such a low N, skeptical. Also claims like these require extraordinary evidence: It has now been established [33, 34, 35, 36] that brain rhythms include ultra-slow frequency oscillations (USFO), which are usually not detected by standard electroencephalogram measurements. The frequency range of these oscillations corresponds to very low-frequency pulsations Pc3–4 characteristic of a polar cusp. Among the ultra-slow fluctuations, the rhythm with a period of 15–40 s is remarkable in that the human brain is accompanied by transitions of levels of consciousness, for example, transitions to the hypnotic state. The fluctuations in the decasecond range correspond to the period of fluctuations of the pulsations Pc3, the amplitude and intensity of which are significantly higher during the polar day than in the polar night. It is not excluded that Pc3–4 pulsations can contribute, along with other factors, to the unstable mental state of the residents of arch. Spitsbergen. (But then maybe that's just my unstable mental state talking, having lived there for a year when I was five. I didn't notice any geocosmic agents, I mostly just remember the reindeer and the heating pipes criss-crossing Longyearbyen.)