Which filter setting creates a very narrow band pass that should rarely be used clinically?

The filter setting that creates a very narrow band pass which is rarely used clinically is characterized by low-frequency and high-frequency cutoff values that closely restrict the frequencies being analyzed. The configuration of low frequency at 5.0 Hz and high frequency at 15 Hz results in a very limited bandwidth of only 10 Hz, which is not ideal for most clinical applications where a broader range of brain activity needs to be captured.

In typical EEG practice, the bandwidth must be wide enough to encompass relevant brain wave patterns, such as alpha, beta, delta, and theta rhythms. A band pass filter set to 5.0 to 15 Hz may exclude important activity outside this narrow range, making it unsuitable for comprehensive EEG interpretation. Instead, broader settings allow for clearer observation of brain function and abnormalities, increasing diagnostic effectiveness.

The other configurations of low frequencies at 0.1 Hz combined with higher frequencies provide more versatility by capturing a wider array of brain signals, thus being preferable in a clinical context.