Search found 9 matches

by pcp15srl
Fri Mar 02, 2018 4:05 pm
Forum: BioSemi all other topics
Topic: Exporting GSR signals for analysis
Replies: 10
Views: 1100

Re: Exporting GSR signals for analysis

Hi Coen, I wasn't able to get my hands on a resistor this afternoon, but instead I hooked up another lab member to the GSR electrodes and compared what Actiview was showing me with what the .bdf file is recording. When actiview was showing a value of 6500 nanosiemens, my bdf file gave the same value...
by pcp15srl
Thu Mar 01, 2018 7:34 pm
Forum: BioSemi all other topics
Topic: Exporting GSR signals for analysis
Replies: 10
Views: 1100

Re: Exporting GSR signals for analysis

Hi Coen, Yes so this is what is making me think that the conversion is not quite correct. For one of my data files applying this conversion will give you the following values: 0.327120788 0.327234528 0.327570769 0.327817259 0.327959778 0.328092834 0.328210144 0.328242156 0.328274169 0.328317566 0.32...
by pcp15srl
Wed Feb 28, 2018 11:44 am
Forum: BioSemi all other topics
Topic: Exporting GSR signals for analysis
Replies: 10
Views: 1100

Re: Exporting GSR signals for analysis

Hi Coen,

Thanks for this, I've had a look at the information stored in the .bdf header, so what you've said makes much more sense to me!

Best wishes,

Sam
by pcp15srl
Tue Feb 27, 2018 4:59 pm
Forum: BioSemi all other topics
Topic: Exporting GSR signals for analysis
Replies: 10
Views: 1100

Re: Exporting GSR signals for analysis

So the only conversion of the values should be GSR_Value/32000? Here is the same data with this conversion applied: Time (s) 0 0.04 0.08 0.12 0.16 0.2 0.24 0.28 0.32 0.36 0.4 0.44 0.970605469 0.970840638 0.971307372 0.971433716 0.971761781 0.972013488 0.972329528 0.972667969 0.972893678 0.973229859 ...
by pcp15srl
Tue Feb 27, 2018 2:34 pm
Forum: BioSemi all other topics
Topic: Exporting GSR signals for analysis
Replies: 10
Views: 1100

Re: Exporting GSR signals for analysis

Hi Coen, Thanks for your response. When I apply this calculation I am getting values that are still quite large (see example of one participants data below), this general pattern of values in the hundreds appears to be consistent across all of my participants, which makes me think there is something...
by pcp15srl
Sat Feb 24, 2018 2:43 pm
Forum: BioSemi all other topics
Topic: Exporting GSR signals for analysis
Replies: 10
Views: 1100

Exporting GSR signals for analysis

Hi, I realise that this has been covered previously, but I am having trouble understanding what calculations are necessary to convert my GSR signals for analysis in other software. I collected my data using the 16 Hz GSR module as part of my ActiveTwo hardware. The software I will be using for analy...
by pcp15srl
Mon Dec 11, 2017 2:13 pm
Forum: BioSemi all other topics
Topic: Strange activity on a single electrode
Replies: 4
Views: 5510

Re: Strange activity on a single electrode

Hi Coen,

This is really useful, thanks a lot for your help!

Best wishes,

Sam
by pcp15srl
Tue Nov 28, 2017 7:57 pm
Forum: BioSemi all other topics
Topic: Strange activity on a single electrode
Replies: 4
Views: 5510

Re: Strange activity on a single electrode

Hi, I'm responding to this old post because we have had the exact same issue during data collection in our lab (high frequency noise in P2, almost certainly due to bridging between P2 and DRL). I'm just wondering whether this bridging introduces noise back into the entire electrode set (due to noise...
by pcp15srl
Wed Aug 09, 2017 11:43 am
Forum: BioSemi all other topics
Topic: EEG Earphones
Replies: 0
Views: 1471

EEG Earphones

Hi, During EEG data collection, I will be presenting various sound stimuli to my participants. I'm looking for some suitable earphones that will not introduce any electrical noise into the recording. Has anyone else used earphones during EEG recordings, if so do you have any recommendations? I've co...