Clipping of the waveforms occurs when:

Clipping of the waveforms occurs when the electrical signal exceeds the upper or lower limits that the digitizer can process. This typically happens when there is an excessively strong input signal, which causes the waveform to be "clipped" at the maximum or minimum voltage, leading to a loss of information in the recorded data. This effect can distort the actual physiological signals being monitored and can make it difficult to interpret the patient's brain activity accurately.

When the waveform is clipped, important details of the signal are lost, such as peaks and troughs that might indicate seizure activity or other brain functions. Therefore, ensuring that the recorded signals are well within the operating range of the digitizer is crucial for obtaining high-quality electroencephalographic data.