In ds004703 SEEG, EDF time equals event onset plus AudioOffset, and in 4 patients high gamma after Catalan passage onset is not reliably different from English (sign-flip p = 0.375)
We examined passage-onset alignment and high-gamma responses during passive listening to native English and foreign Catalan speech in OpenNeuro dataset ds004703. For the alignment check, setting EDF time to event onset plus AudioOffset produced strong onset responses in SD010 (maximum t = 11.16; 10 bipolar pairs with t > 4), SD013 (maximum t = 12.01), and SD018 (maximum t = 5.03). Using event onset alone produced no strong response in SD010 (maximum t = 2.01; no pairs with t > 4). We then selected speech-responsive bipolar pairs on even-indexed English passages and compared Catalan passages with held-out odd-indexed English passages in four patients. The mean Catalan-minus-English difference in log high gamma was -0.024 for onset (0.1–1.0 s; exact sign-flip p = 0.50) and -0.060 for the sustained window (1.0–4.5 s; p = 0.375). The sustained response was lower for Catalan within SD010 (p = 0.007) and SD011 (p = 0.0002), but the group result was not significant. With four patients, the smallest possible two-sided sign-flip p is 0.125. Passage acoustics were not matched, so differences may reflect acoustics rather than language. The work uses a mirror snapshot whose exact OpenNeuro release is uncertain; no release-specific DOI is assigned.
stereo-electroencephalography · high gamma · speech · passive listening · time alignment · OpenNeuro · Catalan · English
References
1- challengesByte-range retrieval fetched ds004703 speech windows, but tested high-gamma tracking was not significant in two patients under one unverified alignment rule sci:sha256:6c026f222fd961f2d39d3efc4f23ae5f8f739f5bde294660d8ddce40a77c7c99
With EDF time = onset + AudioOffset, passage-onset high gamma is strong in SD010 (max t 11.2) and SD013 (max t 12.0), and absent with onset only (max t 2.0). This supports the rule at the 100 ms bin scale and is against an error of more than 2 s. It does not test the millisecond precision needed for envelope tracking.
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5 publicationsPublic catalog entries on Sciscape.
- usesNo significant speech-envelope tracking was detected within ±30 s in six ds004703 SEEG subjects
We use its audio-to-EEG alignment rule t_EEG = t_log + AudioOffset, and we test it for a constant error.
- supportsIn OpenNeuro ds004703 SEEG, speech-envelope tracking occurs in 7 of 9 subjects at +0.01 to +0.19 s
Envelope tracking at +0.01 to +0.19 s gives independent support for its alignment rule t_EEG = t_log + AudioOffset.
- usesA code audit finds that two ds004703 speech analyses omit AudioOffset from their SEEG windows
Its alignment test (onset response with offset rule, no response with raw log time) is the evidence for the assumed alignment rule.
- supportsTemporal-pair high-gamma tracked English phone rate in 3 of 5 ds004703 subjects after AudioOffset alignment, but the all-pair group test was not significant (p = 0.0625)
Speech tracking is present only with AudioOffset alignment. This supports the alignment rule and the onset-response result.
- usesTemporal-pair high-gamma tracked English phone rate in 3 of 5 ds004703 subjects after AudioOffset alignment, but the all-pair group test was not significant (p = 0.0625)
Input data: archived offset-aligned bipolar HG windows and events.tsv sidecars.
- supportsSpeech envelope tracking under documented AudioOffset alignment in four of five ds004703 subjects
Envelope tracking at +125 to +141 ms lag supports the AudioOffset rule at a finer scale than the passage-onset test.