BIOPAC® Systems, Inc. Logo

Bipolar EEG

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.

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

modified 1/19/15

Associated Applications

Spotlight On
short, lightweight pinch leads

LEAD115 Lighter Lead Series

New series of unshielded 45 cm electrode leads with thin cable; suitable for facial EMG and other areas where lighter, shorter lead cables are required. Use for female Touchproof connectors to pinch clip connectors—connect electrodes to either a C-series amplifier or an MEC. The pinch connectors are light weight and the lead cable tinsel wire […]

View All
Latest News

Alan Macy Honored as Local Hero

“Alan Macy: Scientist, Entrepreneur, and Visionary Community Builder” The Santa Barbara Independent honored Alan Macy as a Local Hero. “What makes Macy a Santa Barbara Independent Local Hero is the combination of vision, generosity, and persistence he has shown in bringing creative people together and in crafting innovative venues for them to collaborate. …For this, and for his […]

BIOPAC Releases New BioNomadix Smart Center System

Good quality data is important for reliable physiological research. No longer restrained to wires or stationary devices, BIOPAC’s newly released Smart Center is a lightweight and compact system designed to acquire quality data. The portable, wireless device offers high fidelity physiological data, allowing for subjects to be untethered while being recorded. The system includes the […]

Read All
Request a Demonstration
Request a Demonstration