Certified Polysomnographic Technician (CPSGT) Practice Exam 2025 - Free CPSGT Practice Questions and Study Guide

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When exploring and reference electrodes are close together, what is the expected amplitude?

High

Low

When exploring and reference electrodes are positioned close together, the expected amplitude of the recorded signal is typically low. This phenomenon occurs because the separation between the electrodes influences the spatial resolution of the electrical activity being measured. When the electrodes are near each other, the difference in potential measured between them tends to be smaller, resulting in a diminished signal amplitude. This is due to the fact that they are picking up similar electrical activity from the surrounding tissues, which reduces the effective signal.

In contrast, greater distances between exploring and reference electrodes would yield higher amplitudes, as they can more effectively capture gradients of electrical signals generated by neuronal activity in the brain. Thus, the close placement of the electrodes directly correlates with a lower measurable amplitude in the recording.

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Moderate

Variable

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