A montage with the following derivations on adjacent channels is described as Fp1-F3 F3-C3 C3-P3 P3-O1. What type of montage is this?

The montage described, with derivations such as Fp1-F3, F3-C3, C3-P3, and P3-O1, is classified as a bipolar montage. This type of montage is characterized by the recording of the voltage difference between two adjacent electrode sites. In this montage, each channel measures the voltage difference between one electrode and the adjacent electrode to the right or left, creating a bipolar setup.

For example, in Fp1-F3, the electrical activity is recorded as the difference between these two frontal electrodes. Each subsequent channel continues this pattern of measuring the potential difference between pairs of adjacent electrodes. This arrangement helps highlight the localized electrical activity in the brain by providing a clearer representation of the directional flow of electrical signals.

The bipolar configuration is useful in clinical settings, particularly in sleep studies, as it can enhance the visibility of certain brain wave patterns and improve the differentiation of electrical activity across the cortex. This may also be advantageous in identifying specific brain states during polysomnographic monitoring.

Other montage types, like referential, involve recording from one location against a common reference point rather than between adjacent electrodes, which clarifies why this is not a referential montage. Similarly, options like common ground or transcerebral