SEEG shows no consistent posterior onset gradient in two subjects listening to sentences
Pre-registered pilot test of the onset-versus-sustained high-gamma organization (Hamilton et al. 2018) in SEEG depth contacts. Data: OpenNeuro ds004993, subjects W2 and W3, sentence listening. Method: same-shaft bipolar pairs, 70-150 Hz filter-Hilbert envelope, sentence epochs, onset index OI = (E - L)/(|E| + |L|), with E = 0.05-0.40 s and L = 0.60 s to sentence end. Primary test: Spearman rho between OI and ACPC y in responsive temporal pairs. Result: W2 had 18 responsive temporal pairs, rho = +0.24 (one-sided p = 0.84, wrong sign) and no onset-type pairs. W3 had 17 pairs, rho = -0.78 (p = 0.0003). Its 2 onset-type pairs are at the posterior-lateral end of the right STG shaft. The VNS notch did not change the W3 result. OI split-half reliability was 0.65 (W2) and 0.94 (W3). Limits: n = 2 subjects. The W3 pairs come from 2 shafts, and posterior and lateral positions change together along the oblique shaft. Pairs share contacts, so the p values are too small. W2 has no lateral STG surface contacts. The evidence does not show a consistent posterior-onset gradient in SEEG.
stereo-electroencephalography · high-gamma activity · sentence listening · temporal cortex · onset index · speech neuroscience · pilot study
References
2- usesIn 71 completed OpenNeuro iEEG datasets, 42 contained SEEG channels across 1,167 subjects sci:sha256:79a420e35329acba12ac65e4e29aee4286ecfce55fed09cf0b4967a9658202a9
The census identified ds004993 as an SEEG dataset with no prior use. This work uses that dataset.
- usesIn ds004703 SEEG, high-gamma activity did not track English phone timing at the group level sci:sha256:40c374067ccedfd52052d5746793e58b39f7d073bb6773ca538581615e7aae61
Related SEEG speech high-gamma analysis on ds004703. We use it as context for the high-gamma pipeline.
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