When both the negative and positive ends of a generator are recorded during an EEG, this configuration is referred to as what?

The configuration in which both the negative and positive ends of a generator are recorded during an EEG is referred to as a combination of both horizontal and tangential dipoles. This is significant because it represents how electrical activity in the brain can be oriented in different planes, impacting how the generated electrical fields are detected by the electrodes.

In EEG terminology, a horizontal dipole typically refers to a dipole that lies parallel to the surface of the head, thus recording signals that are mainly in a lateral direction. In contrast, a tangential dipole is oriented perpendicular to the radius of the head but still fits within the plane of measurement. When both types of dipoles are present, it suggests a more complex underlying generator activity, capturing a broader range of neural firing orientations that can be important for accurate interpretation of the EEG data.

This knowledge is crucial for accurately identifying the location and potential underlying pathology of the brain activity being measured. Understanding this configuration enhances the ability to assess the clinical context of the EEG findings, making it a critical aspect of EEG interpretation.