To record bipolar EEG, you will need an EEG amplifier for each pair of electrodes that you want to calculate the potential difference between. It is important to note that you can also derive bipolar measurements from unipolar measurements. This is done in software. For example, if you are recording from sites A, B, C in unipolar you can then get the following bipolar measurements:
AB by calculating A-B
BC by calculating B-C
AC by calculating A-C
If you want to look at all possible pairs, you can calculate the combinations without repetition: n!/(r!(n-r)!) where n is the number of electrodes and r is 2.
- For example, for a bipolar recording on 5 sites you would need 5!/(2!3!) = 10 EEG amplifiers. This assumes that you want to look at the potential difference between all possible combinations of electrode sites. This is the maximum number of EEG amplifiers that would be required.
Here is a reference for the number of EEG amplifiers required if you need to look at all electrode pair potential differences:
2 electrodes: 1 amplifier
3 electrodes: 3 amplifiers
4 electrodes: 6 amplifiers
5 electrodes: 10 amplifiers
6 electrodes: 15 amplifiers
Join us to learn how to use Workflow to automate and standardize procedures in HRV Frequency Domain Analysis.
This training will show attendees how to create simple workflows, from opening files, to conditioning and preparing data for analysis, to the extraction of meaningful information in HRV research.
Join Live! Oct. 5 Register Now
8am PT | 11am ET | 4pm GMT
BIOPAC tools are used for studies in a variety of different fields and disciplines. AcqKnowledge software is one of our universally applicable tools, used by thousands of labs around the world and cited in thousands of peer reviewed publications, such as the following studies… The psychophysiology of guilt in healthy adults. Cognitive, Affective, & Behavioral Neuroscience, 1-18. […]
We had the opportunity to meet lots of researchers at our 4T|Phys Human Physiology Conference this month and demonstrate solutions for life science studies. We presented 39 unique skills sessions, including sessions on measuring blood pressure, recording HRV, and utilizing VR. These studies all apply these skills and further demonstrate how to apply our equipment… Real-Time Personalized Physiologically […] Read All