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
Eyes are the window to the soul and, more importantly, the brain. Psychophysiology, neuroscience, and consumer neuroscience researchers use eye tracking technology to understand emotion, behavior, subject response, decision-making, and human performance—and to help improve products and services. But not everyone knows where to start or how and why to use this important technology. A panel of eye tracking experts will present typical use cases and the latest eye tracking technology.
Join this online presentation with Q&A to learn the fundamentals of eye tracking!
Thursday, Nov. 21st
8:00-9:00 am PT
Recent physiological studies feature BIOPAC’s Wireless BioNomadix Data Recorders Using Metronomes and Rhythmic stimulation to help people with Parkinson’s disease walk For those living with Parkinson’s disease, even simple tasks can take too long to accomplish properly, such as crossing a room or picking up an object. In this study, participants with diagnosed cases of […]
BIOPAC’s just released Introductory ECG Guide addresses fundamental to advanced concerns to optimize electrocardiography data recording and analysis. Topics include: ECG Complex; Electrical and Mechanical Sequence of a Heartbeat; Systole and Diastole; Configurations for Lead I, Lead II, Lead III, 6-lead ECG, 12-lead ECG, precordial leads; Ventricular Late Potentials (VLPs); ECG Measurement Tools; Automated Analysis Routines […]
Read All