Which change would increase the resolution of EEG spikes and improve waveform definition?

Which change would increase the resolution of EEG spikes and improve waveform definition?

• A. Applying 50/60 Hz filtering
• B. Using a 100uV input voltage
• C. Increasing sensitivity
• D. Increasing sampling rate

Answer: (D)

Temporal resolution is what lets us see the fast details of an EEG spike. Spikes are brief events with sharp onsets and may contain high-frequency components, so we need enough samples across the spike to accurately depict its shape and timing. The sampling rate determines how many measurements per second you collect, and, according to Nyquist, you should sample at least twice the highest frequency of interest to reconstruct the waveform. Increasing the sampling rate provides more data points across the spike, reducing discretization error and yielding a clearer, more precise definition of peak amplitude and timing. Filtering to remove line noise can help reduce interference but doesn’t improve how finely the signal is sampled and can even distort fast components if applied too aggressively. Changes to amplifier sensitivity or input range alter how signals are scaled or noise is handled but do not add more samples, so they don’t directly enhance spike resolution.

Temporal resolution is what lets us see the fast details of an EEG spike. Spikes are brief events with sharp onsets and may contain high-frequency components, so we need enough samples across the spike to accurately depict its shape and timing. The sampling rate determines how many measurements per second you collect, and, according to Nyquist, you should sample at least twice the highest frequency of interest to reconstruct the waveform. Increasing the sampling rate provides more data points across the spike, reducing discretization error and yielding a clearer, more precise definition of peak amplitude and timing. Filtering to remove line noise can help reduce interference but doesn’t improve how finely the signal is sampled and can even distort fast components if applied too aggressively. Changes to amplifier sensitivity or input range alter how signals are scaled or noise is handled but do not add more samples, so they don’t directly enhance spike resolution.