Benjamin has recovered well from his surgery (scoliosis correction) and is feeling quite his usual self again today after a good trip out to the football, with much bouncing around his bedroom sorting things (no sound on this video – imagine loud ‘Haaa’ sounds!).
This behaviour is really challenging to differentiate between this and a seizure using the simple algorithm we use in the pebble watch, so he keeps setting off his seizure detector alarm. While it’s nice to know he is feeling better, the beeps get annoying and you start to ignore them if they go off too often, so I had to do something about it….
I have had a look at the alarm log and in all cases the spectral power in the 5-10Hz region of interest is well over the threshold level, but the ratio of the power in the region of interest to the whole spectrum is borderline – the ratio alarm level is set to 30 by default (=3.0 ratio) and he is generating a ratio of between 3 and 4. This means that a relatively minor change to the ratio alarm level could solve the problem without compromising the detection capability. I have increased the ratio threshold to 40 (=4.0 ratio). At this level it just avoids going off with the sorting movements, but still alarms easily with a seizure-like shaking of the arm without other movement going on too. Will test for a while and see how it goes.
I think I’ll write a page describing what the settings are and how to tune them in case other people have trouble….
[Note, I think I had done this before (but maybe not increased the ratio threshold as far as 4.0), but re-installed the app and lost my settings – should have written them down!].