Search found 3 matches

by ciara123
Mon Nov 11, 2019 5:16 pm
Forum: BioSemi Hardware
Topic: Photosensor data
Replies: 1
Views: 7840

Photosensor data

Hi, I am using the BioSemi photosensor for the first time and am not sure if we are using it correctly. I have attached one example of data output from the sensor where I have tested it with black/white/gray screen colour changes every 2s. We seem to have very noisy data. The photosensor is attached...
by ciara123
Tue Sep 17, 2019 10:40 am
Forum: BioSemi Software (ActiView executable)
Topic: different trigger codes in bdf
Replies: 5
Views: 12290

Re: different trigger codes in bdf

Hi, Thank you very much for your response. I am still unsure as to why we have correct trigger codes when I use the decimal settings in ActiView, but then different ones in the .bdf file? Also, apologies for this, but how exactly do I split the 16 bit trigger word in two 8 bit bytes? Kind regards, C...
by ciara123
Mon Sep 16, 2019 5:35 pm
Forum: BioSemi Software (ActiView executable)
Topic: different trigger codes in bdf
Replies: 5
Views: 12290

different trigger codes in bdf

Hi, I am piloting some EEG tasks (Matlab scripts) and am finding that the trigger codes saved to the .bdf files are different to those I see in the actiview window when collecting data. For example when running an MMN paradigm, the codes are in the 200's but when I open the .bdf file in eeglab the t...