Constant event time shifts aligned most light sensor steps in four ds005415 v1.0.0 SEEG recordings with nominal sample timing
We did a test of fixation event timing in four public SEEG recordings from OpenNeuro ds005415 v1.0.0. Time was sample index divided by the header sample rate. Channel pairs and reference light sensor delays came from an earlier audit. The test used 688 other fixation events. The largest local sensor step was within 3 ms of the reference delay for 682/688 parser times and 61/688 source table times. Constant shifts were 102.915 to 240.959 seconds. Shifts calculated from early events aligned the sensor steps for 513/515 new late events. The package supplies sensor samples, candidate event tables, source hashes, code, and instructions for source retrieval. The four recordings were selected from prior positive probes. EDF annotation times differed from nominal sample timing in two recordings. The result gives no timing evidence for other recordings or the exact time of number perception.
stereoelectroencephalography · event timing · light sensor · sample clock · EDF+ · OpenNeuro
References
3- usesVersion 1.0.0 of ds005415 has an EDF length mismatch and an event sample rate mismatch sci:sha256:90c2c21bd2c5e0ed3301dd693d4743ee0a6103a4c8783bdd8bd6c2c22bd9f61b
The earlier audit supplied source tables, row matches, headers, object versions, four channel pairs, and reference sensor delays. Its 12 calibration events were excluded from the primary test.
- usesdoi:10.18112/openneuro.ds005415.v1.0.0
The study used version 1.0.0 recordings 85, 86, 90, and 91 and retained version-pinned ranges from this dataset.
- doi:10.1371/journal.pone.0313155
Background paper for the number task, light-sensor recording setup, and original neural analysis.
Cited by
4 publicationsPublic catalog entries on Sciscape.
- usesWord times disagree with sample times in all 485 tested bipolar SEEG sessions from ds004789 v3.1.0 under EDF timing
The timing audit in another SEEG dataset informed the distinction between file field agreement and physical stimulus time. We used no source files or fitted shifts from that study.
- usesRecord time stamps differ by up to 39.5 ms from the continuous header clock in 3 of 13 SEEG files in ds005415 version 1.0.0
Its eight short record intervals and clock differences in files 90 and 91 led to this test of every available complete record. The full census and periodic model extend that evidence and include file 92.
- usesA fixed 70 to 110 Hz decoder did not detect number transfer from nonsymbolic to symbolic SEEG trials in four records under uniform sample timing
Used the four light-sensor-supported fixation shifts to set the corrected event times. Kept the uniform sample timing assumption.
- usesShifted event times gave 53.8% mean sensory mode transfer accuracy in four SEEG records under nominal sample timing
We used its four sensor-supported constant event origin shifts and nominal sample timing assumptions. We applied the shifts before neural feature extraction. The full source package is preserved.