Search found 13 matches

by Alexandre
Thu Dec 12, 2013 9:53 pm
Forum: BioSemi Hardware
Topic: How to capture analog data above 2kHz ?
Replies: 3
Views: 2935

Re: How to capture analog data above 2kHz ?

Hello, Thank you for your quick reply. I do not have an ego input and my ports are already taken by a GSR/RESP port and an ABR port. Is there another way that would allow me to do that ? What about the GSR / Resp port, could I input some voltage to it ? My sensor is a Force Resistance Sensor. Thank ...
by Alexandre
Fri Dec 06, 2013 11:36 pm
Forum: BioSemi Hardware
Topic: How to capture analog data above 2kHz ?
Replies: 3
Views: 2935

How to capture analog data above 2kHz ?

Hello, I need to capture analog signal from a sensor device. I have an AIB box, but I am confused by what I have read on the webpage. If I understood correctly, my AIB Box is useless for sample rates above 2kHz ? What is the easiest way then to aquire information from my sensor on a EXG channel, in ...
by Alexandre
Mon May 28, 2012 8:10 pm
Forum: BioSemi Hardware
Topic: Massive 16Hz contamination from GSR sensor
Replies: 1
Views: 2631

Massive 16Hz contamination from GSR sensor

Hello, We are willing to record GSR alongside EEG, we are using the 16Hz SC coupler. When connected to the subjects finger, I can see a good GSR signal and how it is modified by subjects taking a deep breath. But the EEG channels are all massively contaminated by 16Hz (barbwire look to quote from an...
by Alexandre
Fri May 11, 2012 4:39 pm
Forum: BioSemi Hardware
Topic: Combo Input
Replies: 1
Views: 2308

Combo Input

Hello, In my lab we have several biosemi systems, complete with a whole bunch of accessories. I am willing to use GSR and respiration belt, for which I found that we have purchased the sensors. There is a dedicated input called "GSR Resp" on our amps. The GSR sensor fits and works well, the respirat...
by Alexandre
Thu Oct 06, 2011 8:17 pm
Forum: EEG data analysis
Topic: How to get a clean Auditory Brainstem Response ?
Replies: 5
Views: 7831

Hi Hal,

Thanks for your comment.
Indeed, using a low stimulation rate and enough repetitions, I was able to get a clean response with the 5 waves present. Best
by Alexandre
Fri Jul 08, 2011 7:12 pm
Forum: BioSemi Hardware
Topic: ABR / ERP simultaneous recording
Replies: 5
Views: 5570

Thank you

Thank you for this fresh paper. So if I understand well you actually used mode 7 with conventional Biosemi electrodes ? Did you carry out your analyses with EEGLAB ? What about introducing a random jitter between two stimuli to avoid responses from previous trials ?

Best

Alexandre
by Alexandre
Wed Jun 08, 2011 6:39 pm
Forum: EEG data analysis
Topic: How to get a clean Auditory Brainstem Response ?
Replies: 5
Views: 7831

Thank you for your reply, I use the special ABR electrodes in speedmode 9. I am not using the online average, I do perform the averaging offline in matlab. I get a dstinguishable wave 5 but the other waves are quite messy. Indeed my problem has to do with noise. My main question was about the intens...
by Alexandre
Tue Jun 07, 2011 6:38 pm
Forum: EEG data analysis
Topic: How to get a clean Auditory Brainstem Response ?
Replies: 5
Views: 7831

Any hint ?

Hello,

Does anybody use Biosemi for ABRs that could comment ?
Shall I rather email directly to support ?
Thank you

A.
by Alexandre
Mon May 30, 2011 9:52 pm
Forum: EEG data analysis
Topic: How to get a clean Auditory Brainstem Response ?
Replies: 5
Views: 7831

How to get a clean Auditory Brainstem Response ?

Hello, I have the ABR system and using it in speedmode 9 to collect ABR to click sounds. I have some trouble obtaining a clean response that could be compared to a clinical ABR. I found this nice graph on your website http://www.biosemi.com/abr.htm You provide some details about how you generated th...
by Alexandre
Thu Jul 09, 2009 4:14 pm
Forum: EEG data analysis
Topic: Importing referenced ABR data into EEGlab ?
Replies: 2
Views: 4277

Thanks, I will try this out !
Best
by Alexandre
Thu Jul 09, 2009 4:13 pm
Forum: BioSemi all other topics
Topic: Conductance gel
Replies: 6
Views: 6033

Thanks, I will try this out !
Best
by Alexandre
Wed Jul 08, 2009 5:03 pm
Forum: BioSemi all other topics
Topic: Conductance gel
Replies: 6
Views: 6033

A way to monitor correct wiring

[quote]most interesting is to know how do you measure impedances and why?[/quote] Indeed I understood that because of active electrodes, no scrubbing is necessary, but still, how can i control that the contact between the electrodes and the skin is good enough (especially in the case of using paste ...
by Alexandre
Tue Jul 07, 2009 6:40 pm
Forum: EEG data analysis
Topic: Importing referenced ABR data into EEGlab ?
Replies: 2
Views: 4277

Importing referenced ABR data into EEGlab ?

Hello, I am a newbie and use the ABR recording software (Auditory Brainstem Recording) from BioSemi to carry out psychophysical experiments. When importing my BDF data in EEGlab I get the following message "We highly recommend that you choose a reference channel IF these are Biosemi data (e.g., a ma...