What does horizontal resolution in EEG refer to?

Horizontal resolution in EEG is fundamentally about the number of data points stored per second while recording an EEG signal. This aspect is crucial because it determines how much detail can be captured within a given time frame. A higher horizontal resolution allows for a more precise representation of the electrical activity of the brain, which can provide insights into the timing and characteristics of neural events. This temporal resolution is essential for identifying rapid changes in brain activity that could correlate with cognitive functions, seizures, or other critical neurological events.

In contrast, the other choices discuss different aspects that do not relate directly to how finely the EEG can capture data points over time. For example, the amount of time needed for signal stabilization relates to the system's readiness rather than its ability to record detail. Depth of signal analysis pertains to the complexity and thoroughness of interpreting the data rather than the resolution itself. Capacity of storage disk is about the physical limitations of data storage rather than the resolution of the recording process. Hence, the choice highlighting the number of data points recorded per second accurately describes the concept of horizontal resolution in EEG.