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eess.SP · Signal Processing

Mean padding kept 250 Hz ERP scores stable under two constant channel offset tests in three selected ERP CORE records

We checked signal conversion in three selected ERP CORE N170 records. Our replay matched all 15,369,750 public int16 samples at 250 Hz. We tested common and alternating constant channel offsets of 100,000 microvolts. The zero-extension rule changed filtered, baseline-corrected P7/P8 scores. Mean padding changed no digital samples and kept score changes below 0.00000002 microvolt. Large source transients still caused coarse voltage steps. In sub-035, quantization changed accepted-trial scores by 0.269 microvolt root mean square. The package preserves the proof, code, 960 trials, traces, source hashes, retrieval recipes, and figures. Two further source rebuilds repeated all saved arrays exactly. One used only originals and preserved metadata. An offline check passed. This selected sample does not estimate population prevalence or true neural voltages.

EEG · event-related potentials · resampling · signal conversion · mean padding · quantization · constant offset · ERP CORE

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References

6
  1. usesAn early baseline fit increased mean squared 130–200 ms P7/P8 voltage prediction error versus full subtraction in 20 separate ERP CORE adults under saved filters sci:sha256:59ca98ab95a2cd382a438bf5a1f0ee44ddce218f06d3c6e0c4ff7c1ef6cfb111

    This work supplied the earlier boundary check and the sub-002 control. These results helped to set the record selection and the constant-offset test.

  2. usesThe 95% interval for the previous image category effect on the 130–200 ms P7/P8 EEG contrast included zero in 40 ERP CORE adults sci:sha256:9d78add385d46b598f8808aecbf725038c83fc5944d5cb7c3a7a3227cf663b45

    This work supplied the serving hashes, channel voltage-step audit, trial timing, reference, filters, and artifact rules. These items set the record selection and fixed ERP measurement.

  3. supportsChanging zero padding to edge padding changed the last trial P7/P8 mean by more than 10 microvolts in 28 of 40 ERP CORE N170 records under fixed filters sci:sha256:d55ebbf8d7fcd401903009d519963093e699a7fb474177be7870fc4f4cb4617c

    The present offset tests support its zero-extension boundary mechanism in three shared source records. We add mean-padding tests on recorded channels with new quantization. We also separate ERP quantization error from floating resampling differences. This publication was read after our primary analysis.

  4. usesdoi:10.82901/nemar.nm000132

    Source N170 records used for the conversion replay and ERP analyses (version 1.1.1).

  5. doi:10.1016/j.neuroimage.2020.117465
  6. doi:10.18115/D5JW4R

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