Key result
High-pass filters above 0.3 Hz significantly alter P300 peak voltages and latencies.
Why the study?
The selection of high-pass filter cutoff frequencies in P300 studies remains a serious methodological consideration without consensus on an optimal range.
Does the choice of high-pass filter cutoff affect P300 voltage and latency in healthy males?
Does the choice of high-pass filter cutoff affect P300 voltage and latency in healthy males?
High-pass filter cutoffs in P300 studies should be set no higher than 0.3 Hz to avoid significant alterations in voltage and latency measurements.
High-pass filters >0.3 Hz alter P300 measures; Level 5 data leaves optimal bandpass open for larger confirmatory studies.
The selection of which high-pass filter cutoff to use in P300 studies continues to be a serious methodological consideration. To determine whether there was an optimal range of bandpass widths-a range in which P300 voltage and latency would not show statistically significant differences-the authors recorded P300 responses to the auditory "oddball" paradigm from Cz and Pz electrodes in a group of eight healthy males. The authors used high-pass filter cutoffs of 0.01, 0.1, 0.3, and 1.0 Hz with low-pass filter cutoffs of 30 and 100 Hz and measured both P300 peak voltages and P300 integrated mean voltages at 12 bandpass settings. There were statistically significant differences in 7 out of 12 bandpass comparisons for P300 peak voltages and in 7 out of 12 bandwidth comparisons for P300 integrated mean voltages. For P300 latencies, there were statistically significant differences in 9 out of 12 bandwidth comparisons. Based on these results, the best recommendation, therefore, is that the high-pass filter be set no higher than 0.3 Hz.
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Holinger et al. (2000) studied Healthy volunteers (n=8). High-pass and low-pass filter cutoffs vs. Alternative bandpass settings was evaluated on P300 peak voltages, integrated mean voltages, and latencies. Testing 12 bandpass settings revealed significant differences in P300 peak voltages (7/12 comparisons) and latencies (9/12), suggesting high-pass filters should be set no higher than 0.3 Hz.
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