Hi,
A project I am starting to work on was recording skin conductance using a BIOPAC device. We normally analyze the microsiemen recording and the voltage recording just jitters around zero. However, we accidentally had the channel set to "2" (the physical red channel setting on top) for like... 50 subjects. Picture of BIOPAC setting set at "2" here. Computer settings set for "1".We typically record with the channel set to "1." Because it was set to "2," the microsiemen data is meaningless. Rather than seeing the recordings look normal, the microsiemen values are now all just jittering around 0, and the voltage values now are vaguely looking like what we normally see in the microsiemen channel.
Is anybody familiar with this technology? Is there any way to recover this data? We know that there are basic electricity laws (S = A / V), but we couldn't use this basic equation to recover the data, since the current value (A) doesn't seem to be constant across different subjects.
Any thoughts would be very helpful.
Thanks
If anybody is arriving here from Google and has this problem too... I crossposted to r/Neuroscience.
EDIT: I called BIOPAC and they told me I needed to rescale some values. To do this I opened my bad files, I then clicked on my volt channel, then I went to Transform > Rescale, and I inserted new values in the four boxes that appeared. You should see four boxes with two on the left side pointing to two on the right side. The left-hand values are not correct. To find out the values they should be, you need to open up a file you properly recorded and then go to the MP150 button on top, then click "view by channels", then click "settings", then "Yes." This will open up a window which shows 4 boxes with values in a similar configuration as in the boxes associated with the bad files. Take the left side values and replace the values in the other boxes with these values. Check the box for "transform entire waveform" if it is unchecked, and then click transform.
Hi all,
I'm working on a design for a GSR Sensor. I have it made it in hardware and am getting oscillating readings when I place the sensors on the medial phalanx of my pointer and middle fingers of one hand. The output of the op amp goes to the analog in of my arduino uno.
Here is the schematic for the circuit:
The Highlighted potentiometer is the body resistance, I measured mine to be around 9.5 Mohm just now.
Can anyone see any reason for this oscillation based on the schematic? Does anyone have any suggestions on what I could do better here?
I'll describe the circuit a bit here as well, 3.3v goes in and hits a resistor buffer to bring down the current. Then comes a voltage divider to bring the voltage down to around 0.5v. The feedback loop of the non inverting amplifier is set so at a max of 10 Mohm body resistance I should get around 3.3v, it also contains a 1Mohm feedback resistor to bring the current way down to uA. There is another pot attached to ground on the top to further adjust the current going through the body if necessary.
Thanks
Update**
Serial Plotter Oscillation - Oscillation at around 9000 ms or 0.111hz
Update 2**
Op amp in use LMP2231
I'm considering doing something like that as an internship.
Cognitive enhancement by any means necessary (mainly looking at mental training, meditation,transfer of learning,potentially tCS) is probably the topic that fascinates me before all else.
I can use most lab equipment here (the Netherlands) at will, provided I teach myself how to do it (or at least require very little tutoring). I can program python, R and some matlab. I'll have approx. 9 months of time but no real experience in any of the methods mentioned in the title save for the eye tracking, which I'm doing for 8 months now (looking at low level saccade dynamics, doing everything from design to analysis myself)...
I'd be largely self-taught but local guru-ing would be available at least for some stuff (eeg, etc). It would be email contact with e.g. a long-distance supervisor who's more into the theories I want to look at and and a local supervisor for more methodological questions.
Could it work? I'm eager but maybe just naive in thinking that it's a good idea? The alternative is to get involved in a project that's moreorless preconceived... I could do data collection and data analysis. Well...
I've been considering to create a neurofeedback protocol for example. Or simple replicate and do a follow-up to a published study.
I'm curious what you would do if you were a young research master student interested in improving healthy/typical brains/minds to be more intelligent and more loving?
So, I understand how thinking about certain events etc can trigger a detectable signal by measuring skin conductance. I am able to, without thinking of anything, trigger this response at a specific time (less than a second from action to change in conductance). Honestly I'm not sure how I'm doing it. I create the feeling of "stomach butterflies" and it just happens. Any suggestions on a method to figure out what I am actually "doing" to initiate the response?
Hi,
A project I am starting to work on was recording skin conductance using a BIOPAC device. We normally analyze the microsiemen recording and the voltage recording just jitters around zero. However, we accidentally had the channel set to "2" (the physical red channel setting on top) for like... 50 subjects. Picture of BIOPAC setting set at "2" here. Computer settings set for "1".We typically record with the channel set to "1." Because it was set to "2," the microsiemen data is meaningless. Rather than seeing the recordings look normal, the microsiemen values are now all just jittering around 0, and the voltage values now are vaguely looking like what we normally see in the microsiemen channel.
Is anybody familiar with this technology? Is there any way to recover this data? We know that there are basic electricity laws (S = A / V), but we couldn't use this basic equation to recover the data, since the current value (A) doesn't seem to be constant across different subjects.
Any thoughts would be very helpful.
Thanks
If anybody is arriving here from Google and has this problem too... I crossposted to r/AcademicPsychology.
EDIT: I called BIOPAC and they told me I needed to rescale some values. To do this I opened my bad files, I then clicked on my volt channel, then I went to Transform > Rescale, and I inserted new values in the four boxes that appeared. You should see four boxes with two on the left side pointing to two on the right side. The left-hand values are not correct. To find out the values they should be, you need to open up a file you properly recorded and then go to the MP150 button on top, then click "view by channels", then click "settings", then "Yes." This will open up a window which shows 4 boxes with values in a similar configuration as in the boxes associated with the bad files. Take the left side values and replace the values in the other boxes with these values. Check the box for "transform entire waveform" if it is unchecked, and then click transform.
