A 0.5 Hz wave is enhanced without affecting a spike using which of the following?

The enhancement of a 0.5 Hz wave without affecting a spike can be attributed to the choice of a low-frequency filter. In this case, selecting a low-frequency cut-off at 0.3 Hz allows for the amplification of the slow wave while avoiding distortion or alteration of higher frequency spikes. By setting the filter below the target frequency of 0.5 Hz, the wave of interest can be accentuated, as it will pass through the filter without being attenuated.

Using a filter at or above 0.5 Hz would not only impact the targeted slow wave but could potentially alter the appearance of spike activity, leading to inaccurate interpretations. Therefore, a low-frequency filter, particularly at 0.3 Hz in this scenario, is optimal for enhancing the 0.5 Hz wave while preserving the integrity of associated spikes.