099i. Smartwatches & Polar H10 & the Muse & OpenBCI only very limited suitable for scientific studies?

This is the hypothesis of Peter Gamma from www.petergamma.org on the 20.2.2024. Peter Gamma from www.petergamma.org is now there where he was on 6. June 2022 with smartwatches:

090. Review of Accuracy Studies of Consumer Grade Heart Rate Monitors: Methods, Testing Protocols, Reference Devices

Hardly anybody reproduces papers written with smartwatches. And with the Muse and OpenBCI, hardly anybody reproduces tests on YouTube and in the web with these EEG devices, for instance here:

Flavio Frohlich, Stellarpower, Jenelson, Thanasis Koutras, paid promotional demo makers to make a marketing study paid by Texas Instruments to find out about Peter Gamma from www.petergamma.org?

And OpenBCI made in China is full of issues:

099d. OpenBCI made in China – what do we know about it?

And no one seems to resolve these issues in a reproducable way. This is neither proofen nor disproofen, it is difficult to proof or disproof, Peter Gamma from www.petergamma.org does not know it. But still this is the hypothesis of Peter Gamma from www.petegamma.org, and he supposes that this hypothesis is most likely true, since Peter does not know of papers which stroke him which do not have a conflict of interest which could convincingly demonstrate him that smartwatches, the Polar H10, the Muse, OpenBCI are more tha of very limited suitable for scientific studies.

And this most probably since these devices where not developed for this purpose. And those which where developed for it, are very expensive.