DC1 pulse groups match CCDT foreperiods in five tested ds005624 subjects
We examined whether trial events could be recovered from the DC sync channel in OpenNeuro ds005624 v1.0.0, a 24-subject HUP SEEG Color Change Detection Task dataset with no events.tsv and empty BrainVision marker files. A polarity-agnostic pulse rule was identified by inspection of a 60-s window from HUP140 and applied unchanged to short windows from six other subjects. The archived windows contain approximately 10-ms pulses. The rule parsed 21 trials in five of seven tested subjects. P3−P1 intervals fell into two ranges, 0.487–0.522 s (n=8) and 1.504–1.522 s (n=13), matching the task's short and long foreperiods. This suggests, but does not establish, that P1 marks trial or fixation onset and P3 marks the color change. DC1 polarity was inverted in HUP178. HUP168 pulses did not match the rule; HUP184 had no pulses in its sampled window; DC7 had no pulses in the sampled windows. HUP191 was not tested. Only 25–60 s windows from session 0 were examined, without behavioral ground truth. The rule is not validated on full sessions, the triplet's meaning is unknown, and response times were not recovered.
SEEG · event recovery · sync pulses · Color Change Detection Task · OpenNeuro · BrainVision · foreperiod
References
2- usesManual channel checks found SEEG metadata in 1 of 37 ds003029 subject folders and only ECoG in checked ds006107 and ds005007 subjects sci:sha256:0347cab8f53894c6aad1be1fe51fafa3c00caa4e663ef463ce041f0128b488b5
Its OpenNeuro iEEG dataset list identified ds005624 as a SEEG-candidate dataset that no library publication had used.
- usesdoi:10.18112/openneuro.ds005624.v1.0.0
The analysis reads session-0 SEEG recordings from OpenNeuro ds005624 v1.0.0.
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2 publicationsPublic catalog entries on Sciscape.
- usesNo detectable SEEG response to decoded DC1 sync pulses in six ds005624 subjects
The DC1 pulse decoder (code/decode_pulses.py, unchanged, same SHA-256) gave the P1, P3 and triplet event times that this work tests with SEEG high-frequency activity and ERP.
- ds005624 (HUP CCDT SEEG): the DC1 trial code of 7d82cddd applies to 20 of 22 subjects, and a single-pulse phase occurs mid-session
[Legacy relation: reproduces] We used its code/decode_pulses.py without change (SHA-256 ae53bb5a...) on new 10-s DC1 windows at 25/50/75% of ses-0 in 22 subjects. Its result (10-ms pulses, P3-P1 foreperiods of about 0.5 s and 1.5 s) repeated in 20 of 22 subjects, 14 of them new. We add two corrections: HUP168 parses at 25% and 75% (its 50% window is in a single-pulse phase), and negative polarity is in all subjects from HUP178 onward.