Speech-motor activity rises before spoken recall onset, while auditory activity rises after it
We tested whether the 0.5 s before annotated vocal onset in free-recall analyses contains speech-motor activity and whether the annotation aligns with auditory responses. In 54 people with pure SEEG recordings from OpenNeuro ds004789 v3.1.0 (session 0; 1,680 isolated recalls), speech-motor high-frequency activity (70–150 Hz) was elevated in the pre-onset window (+0.24 dB, 95% bootstrap CI 0.16 to 0.32; Holm p = 0.0004). Auditory activity increased after onset (+0.68 dB, CI 0.49 to 0.90; p = 0.0004), with a small pre-onset increase (+0.08 dB; p = 0.015). Grand-mean 50% rises occurred at −0.18 s for speech-motor and +0.04 s for auditory activity, but the per-person latency difference was not significant (n = 38, mean +0.02 s, p = 0.75). These results support annotation accuracy at the group level and show that baseline contrasts in the usual pre-recall window can include speech preparation. No audio was available to establish true sound onset; anatomy was atlas-labeled, and data came from one session of epilepsy patients.
free recall · speech motor · auditory cortex · SEEG · high-frequency activity · vocal onset · memory · neuroscience
References
6- usesIn 71 completed OpenNeuro iEEG datasets, 42 contained SEEG channels across 1,167 subjects sci:sha256:79a420e35329acba12ac65e4e29aee4286ecfce55fed09cf0b4967a9658202a9
This work used the SEEG channel-type census to identify pure-SEEG subjects.
- usesIn 47 patients, pre-vocal high-frequency activity was elevated for correct recalls in non-hippocampal pairs, but hippocampal specificity was not supported sci:sha256:9c69cbcdd0dbc431454afb784a17253e85cd7185f26e3a7b0a2a341eb058be79
This work gives speech-motor and auditory pre-vocal HFA, which is context for the non-hippocampal pre-vocal effect in that publication.
- usesIn session 0, hippocampal 70–150 Hz power rose before correct recall, but not non-word vocalizations or intrusions sci:sha256:84a42bd21339f01488b7c08ea1383cf40e235d470e91c5464ceda16a2fd630ea
This work uses the same FR1 pre-vocal 0.5 s window and tests if speech-motor HFA is present in it.
- usesHippocampal high-frequency power did not differ significantly by recall contiguity in slow transitions sci:sha256:f2ad33ae7a4d50223507fe3ac24b81b82db23910817b4a511e389c014493319c
This work uses a similar isolated-recall selection and pre-recall window.
- supportsRecall timing agrees within 50 ms for 53 of 54 catFR1 subjects; timing mismatch does not explain the reported null HFA result sci:sha256:fcb00e76d723b456fce3957b4f137fe1fa61976e29147781880fcf8ed992d2b9
The auditory HFA step within 0.1 s after the annotated onset is physiological evidence that RAM vocal-onset annotation is accurate at the group level.
- usesdoi:10.18112/openneuro.ds004789.v3.1.0
This analysis used session 0 of OpenNeuro ds004789 v3.1.0 (RAM FR1), including channel and electrode tables, event annotations, and bipolar EDF recordings.
Cited by
2 publicationsPublic catalog entries on Sciscape.
- usesCue-period 70–150 Hz power was higher before correct cued recall in 18 pure-SEEG patients; 3–8 Hz power did not decrease
Its finding of speech-motor 70-150 Hz power in the 0.5 s before vocal onset sets our rule that the window must end at least 0.5 s before speech.
- usesSEEG speech-related high-gamma activity was bilateral during spoken free recall
We used its archived per-pair mean 70-150 Hz traces (results/pair_mean_traces.npz) and per_subject.tsv (copied with matching SHA-256 hashes), and its event and window definitions (isolated spoken recalls, annotated vocal onset, dB baseline -2.0 to -1.5 s, SMC and AUD regions). We added hemisphere and MNI coordinates from ds004789 electrodes.tsv and tested left versus right.