[Eeglablist] has anyone used an actiCHamp and an ActiveTwo?

[Patrick Simen]

I only have experience with ActiCHamp, so it may be true that BioSemi is better. 

However, I just wanted to say that I haven't found it at all difficult to reduce impedance with the BrainProducts system. It also didn't feel uncomfortable to me when I wore the cap several times and had the electrodes inserted by students (nor when I inserted them myself -- it was easy enough that I could prep myself completely and quickly without assistance from anybody else -- I just needed a handheld mirror to see the occipital electrodes). 

The only thing I really noticed was that reducing impedance was far (!!) easier and more comfortable than the usual process with passive-electrode caps in my previous lab. But that would probably be true with any active electrode cap, I guess.

Incidentally, an engineer at Brain Products also told me something that agrees with what Baris says below: there's not much point in going beyond 64 electrodes. 

Best,

Pat.

On Nov 7, 2012, at 11:10 PM, Baris Demiral wrote:

> Yes I have experience with both. Use BioSemi. Here is my reasoning:
> 
> I used full BioSemi Active2 system (cap+amplifier+LabView+response bix etc.) Electrodes are easy to insert, small, easy to reduce impedance, comfortable. You put the gel before the electrodes are placed.
> 
> I used BProduct Active electrodes with Neuroscan amplifier+electrode box. Electrodes are very large, not easy to place the elctrodes on the cap, subjects feel discomfort. In order to reduce this effect you may need to place the electordes on the manican before you put it on the subject which is weird. Since you will have 128 electrodes !! Also, you ned to insert the gel after you put the electrodes through a small opening, which makes impedance reduction relatively hard to obtain.
> Kinking problem is likely to occur due to the difficulty of placing the electrodes.
> 
> Buy BioSemi. even 64 channel is fine for many applications and source localization. 128 too much and not very necessary (read some papers related to source localization, you will notice that after 60 channels quality does not change much). Kinking proble is likely to occur due to the orientation of the cable placed initially in the beginning. 
> 
> Feel free to call me if you need further help. But, I would suggest (if you are going to pay a lot of money in this business) go and observe the systems in the labs live.
> Baris
> 
> 
> On Fri, Nov 2, 2012 at 11:42 AM, Jason M Cowell <cowell at uchicago.edu> wrote:
> Hello,
> 
>  
> 
> Our lab is presently in the process of acquiring several active 128- electrode systems. Does anyone have experience with both the Brain Products actiCHamp and the BioSemi ActiveTwo? We are comparing both and are interested in the quality of these data, particularly in noise issues. Are either of the systems more compatible with EEGLAB? Any help or experience, particularly using the actiCHamp would be greatly appreciated.
> 
>  
> 
> Jason
> 
>  
> 
> Jason M Cowell, Ph.D.
> 
> Postdoctoral Scholar
> 
> Social Cognitive Neuroscience Lab
> 
> University of Chicago
> 
> 5848 S. University Ave.
> 
> Chicago, IL 60637
> 
>  
> 
> 
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> -- 
> S. Baris Demiral
> NIH/NIDCD
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Patrick Simen, Ph.D.
Assistant Professor, Neuroscience Department
Oberlin College
psimen at oberlin.edu
www.oberlin.edu/faculty/psimen


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