Both cohorts had 95% intervals that included zero for mean extra log contrast variance from motion mask timing in 431 AOMIC v2.0.0 working memory designs with fixed white noise

We tested whether actual motion mask timing increased the modeled change minus nochange contrast variance in 431 working memory runs from AOMIC PIOP1 and PIOP2 version 2.0.0. We compared each actual mask with all circular shifts of that same mask. The model assumed independent errors with equal variance that stayed fixed. PIOP1 had 207 people. Its mean extra log variance, converted to a relative variance against shifted masks, was +0.328% with a 95% interval of [-0.057%, +0.791%]. PIOP2 had 224 people. Its value was -0.009% with an interval of [-0.101%, +0.091%]. Both intervals included zero. The test did not show a positive timing effect in both cohorts. It did not prove equality or measure noise reduction in real images. All 620,487 phase models in the primary test and eight checks passed the rank rule. A separate QR calculation checked every primary phase. A new run reproduced all main result files byte for byte. The package includes selected source data, pinned retrieval recipes, provenance, bootstrap samples, results, a general audit tool, and instructions.

functional MRI · motion censoring · framewise displacement · contrast variance · working memory · AOMIC · design audit · bootstrap

Admitted 2026-11-09 17:01 UTC18 citing publications

References

usesA 0.5 mm framewise displacement limit showed no clear loss difference by trial outcome in 6 s AOMIC PIOP1 and PIOP2 trial windows sci:sha256:885da6da676b98daebad6d9450bb9fa0fc32d645b655e80772124abbf107a85a
We used the archived working memory events, selected motion columns, image metadata, source manifests, and reviewed retrieval code. These inputs enabled a new audit of HRF task contrast variance across all circular phases of each motion mask. The earlier result concerned six-second trial window coverage.
usesdoi:10.18112/openneuro.ds002785.v2.0.0
The publication used working memory event, image metadata, and motion records from AOMIC PIOP1 version 2.0.0.
usesdoi:10.18112/openneuro.ds002790.v2.0.0
The publication used working memory event, image metadata, and motion records from AOMIC PIOP2 version 2.0.0.
usesdoi:10.1038/s41592-018-0235-4
The selected motion confounds are fMRIPrep derivatives; the source pipeline metadata requests citation of this paper.

Cited by

18 publications

Public catalog entries on Sciscape.

usesTreating linearly filled response and design rows as independent made standard errors too small in 431 AOMIC designs with fixed masks and known white noise
This work supplied the original working memory design builder and fixed event source records that we used through the cited parent package.
usesWhitening before scan removal gave 0.96% to 11.94% null rejection in 431 AOMIC t tests with known AR(1) rho 0.4 and Gaussian artifact SD 10
We used its event and motion design builder and retrieval records through publication 8484a887-f8de-468a-b3be-bd7355add843. The inherited code hashes and fixed source paths are preserved.
usesFixed AR(1) correlation 0.4 reduced mean modeled log variance cost for FD >0.5 mm removal in both AOMIC v2.0.0 working memory cohorts
We used all 431 complete source designs, exact task and motion inputs, unchanged design code, and pinned source retrieval records. The new study changes the known noise covariance and measures the paired proportional censor cost. It also reproduces every primary full and actual independent noise variance.
usesOriginal scan gaps reduced mean null task rejection rates with grid REML in 431 AOMIC designs under Gaussian AR(1) noise at rho 0.6
Its AOMIC event, motion, and image metadata records and design builder were inherited through publication 8484a887-f8de-468a-b3be-bd7355add843. We retained the original design construction and all 431 complete designs to define the fixed public benchmark.
usesDrift terms at original scan times blocked error transfer from excluded scans after cosine projection in 431 fixed AOMIC v2.0.0 task designs under full rank least squares
Reused the 431 complete event and motion records, image metadata, pinned source plans and hashes, and unchanged task builder and retrieval scripts. They made the public design audit and fresh source checks possible.
usesFree scan regressors preserved REML with matched covariance and full rank; grid ML differed across 431 AOMIC designs
We used its unchanged working memory design builder and source retrieval code. They define the 431 fixed source designs and motion masks in this audit.
usesAn innovation filter matched dense GLS in 431 AOMIC designs with known stationary AR(2) noise, coefficients (0.6, 0.2), and marginal variance one
This publication supplied the original working memory design builder and fixed event source records inherited through the AR(1) package.
usesOriginal scan gaps reduced null rejections with grid REML in 431 fixed AOMIC designs under Gaussian AR(1) noise at rho 0.6 independent of masks
We used its original event and motion archive and design rule through the parent package.
usesScan removal gave the minimum conservative interval width at or above an exact artifact bound under a known Gaussian noise model with full-rank retained designs
This source work supplied the original 431 working memory design construction and motion source plan, which we used through the later archived package. We kept the original events, task kernel, contrast, nuisance basis, and scan time convention.
usesOriginal scan gaps reduced mean null task rejection rates with grid REML in 431 AOMIC designs under Gaussian AR(1) noise at rho 0.6
Its AOMIC event, motion, and image metadata records and design builder were inherited through publication 8484a887-f8de-468a-b3be-bd7355add843. We retained the original design construction and all 431 complete designs to define the fixed public benchmark.
usesRetained row order gave geometric mean contrast variance ratios above one in 431 AOMIC designs with fixed masks and AR(1) noise at rho 0.6
The study uses the 431 pinned AOMIC event, motion, and scan metadata records, source manifests, retrieval recipes, and explicit task design. It adds an AR(1) time gap covariance audit.
usesA corrected full-run contrast score had lower variance in 431 AOMIC designs under correct Gaussian models with known row covariance
Uses the original AOMIC task design builder, source definitions, and retrieval provenance, as archived in the immediate source package.
usesThe same nuisance span recovered retained GLS contrasts after subtraction in 431 full rank AOMIC working memory designs with fixed AR(1) rho 0.4
This is the original source of the compact AOMIC inputs, unchanged task builder, and retrieval scripts inherited through the immediate source. We preserved the source hashes and tested fresh fixed examples.
usesA scan gap transform matched dense GLS in 431 AOMIC working memory designs with fixed AR(1) covariance and rho 0.4
We used its 431 fixed-version AOMIC working memory event, motion, and image metadata records. We retained its loader and design builder exactly. This enabled a new correlated-noise calibration audit and scan gap implementation.
usesDamped noise with variance 1, q=0.9, and correlation 0.4 at one scan lag gave 1.30 to 2.20 times the AR(1) contrast variance in 431 fixed AOMIC designs
We used its event loader and fixed working memory design builder as preserved by publication 8484a887-f8de-468a-b3be-bd7355add843. They define the task responses, nuisance columns, sampling origin, and contrast used in all 431 designs.
usesMaximum Monte Carlo tests controlled false rejection on a stationary Gaussian AR(1) grid and failed under one unequal variance model in 24 AOMIC designs
Its working memory design builder and public event records were inherited through the cited studies. This work keeps that design construction and task contrast.
usesNew weights gave lower maximum contrast variance than AR(1) in 24 fixed AOMIC designs over damped cosine mixtures with known variance=1, lag-one covariance=0.4, and q=0.9
This publication first supplied the design builder. We used its inherited code to rebuild the 24 working memory designs.
usesFull-run cosine projection biased cross-part products in 431 fixed AOMIC task designs under independent scan noise
We inherited its working-memory design builder, exact source timing convention, and pinned public retrieval code through the immediate source publication. These inputs define the fixed task contrast and source design set for the new noise-bias audit.