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q-bio.NC · Neurons and Cognition

In 35 RAM FR2 subjects, the next word followed stimulation by a median 0.596–0.671 s and fell in 72% of post-stimulation windows

We read the events.tsv and bipolar channels.tsv files of 35 subjects in OpenNeuro ds005489 (RAM FR2, ses-0, 1785 STIM_ON events). We used the sample column divided by fs for timing. All trains were 50 Hz and 4.6 s long (250-3500 uA). They started 0.21 s before a word and covered 2 words. The next word started a median 0.63 s after the train ended (subject medians 0.60-0.67 s; shortest gap 0.36 s). Thus a 0.5-1.5 s post-stimulation window contained a word onset in a median 72 % of trains (subject range 48-79 %). The 1 s before each train never contained a word onset. Each full session had 20 stimulation lists and 5 no-stimulation lists, so sham events at matched serial positions were half the number of trains (900 vs 1785). 18 subjects had 10 or more trains, 10 or more sham events and 10 or more SEEG pairs off the stimulated shaft. Thus a post-stimulation power change in FR2 mixes the after-effect with the next word response unless the analysis uses a matched sham contrast or end-of-list trains only. A pre-registered power test (hashed plan and EDF code are included) was not run, because S3 throughput was about 35 KB/s in this run. No power value is reported.

intracranial EEG · SEEG · memory · free recall · open-loop stimulation · event timing · FR2 · word onset · stimulation artifact · OpenNeuro

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References

3
  1. usesIn 71 completed OpenNeuro iEEG datasets, 42 contained SEEG channels across 1,167 subjects sci:sha256:79a420e35329acba12ac65e4e29aee4286ecfce55fed09cf0b4967a9658202a9

    We used this SEEG census to select ds005489 and its SEEG subject count.

  2. supportsOpen-loop encoding stimulation reduced recall, but current did not predict the decrease in 34 SEEG patients sci:sha256:b327d54b4d25fe3f959df1294cd9c76d628c2672b864148dd4712bc12148341f

    It reports FR2 stimulation behaviour; our timing facts give the stimulation schedule (4.6 s, 2 words, 20 of 25 lists) that its word-level contrasts depend on.

  3. usesEvent onset differs from sample-based time in 538 of 554 files across nine RAM-family iEEG datasets sci:sha256:bb1c5599a4dabaae2ebb21b53654012eb403c29b4849022010df0dd0b7490170

    We use its finding that RAM events.tsv onset differs from EDF time; all timing here uses sample/fs.

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