Abstract
Human vestibular processing involves distributed networks of cortical and subcortical regions which perform sensory and multimodal integrative functions. These functional hubs are also interconnected with areas subserving cognitive, affective, and body-representative domains. Analysis of these diverse components of the vestibular and vestibular-associated networks, and synthesis of their holistic functioning, is therefore vital to our understanding of the genesis of vestibular dysfunctions and aid treatment development. Novel neuroimaging methodologies, including functional and structural connectivity analyses, have provided important contributions in this area, but often require the use of atlases which are comprised of well-defined a priori regions of interest. Investigating vestibular dysfunction requires a more detailed atlas that encompasses cortical, subcortical, cerebellar, and brainstem regions. The present paper represents an effort to establish a compilation of existing, peer-reviewed brain atlases which collectively afford comprehensive coverage of these regions while explicitly focusing on vestibular substrates. It is expected that this compilation will be iteratively improved with additional contributions from researchers in the field.
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Background & Summary
Cortical areas responsive to vestibular stimuli were first delineated using visual and somatosensory stimuli as well as ligand-based tract-tracing in nonhuman primates. These areas include intraparietal area 2 v, a section of area 3a (denoted 3aV), frontal area 6, superior parietal/supramarginal gyrus areas 7a and 7b,and a region, denoted parieto-insular vestibular cortex, or PIVC, which is located in the Sylvian fissure and is densely connected with these areas as well as the vestibular nuclei in the brainstem1,2,3,4,5. Eickhoff and colleagues6,7 conducted histological examinations of the parietal operculum and posterior insula in humans, and proposed that the parieto-insular region was comprised of four cytoarchitectonically distinct subregions: OP1, the equivalent of primate secondary somatosensory cortex; OP2, localized to the depths of the insular-retroinsular Sylvian fissure, and for which no primate equivalent was found; OP3, equivalent to primate somatosensory area VS; and OP4, equivalent to primate area PV. In conjunction with galvanic vestibular stimulation (GVS) studies, Eickhoff et al. proposed that OP2 might serve as the human homologue of the nonhuman primate PIVC. Zu Eulenberg and colleagues8,9 have since leveraged GVS and functional MRI (fMRI) to further localize human vestibular regions, confirming GVS-correlated responses in OP2, 2 v, 3aV, premotor area 6, and area 7 (designated as PF in the von Economo-Koskinas system10,11,12,13), as well as the cerebellar nodules and uvula, visual area hMST, parietal area PFcm, area hIP3 of the intraparietal sulcus, and visual cingulate (CSv, caudal Brodmann area 23), equivalent to primate areas VPS, VIP, and vestibular cingulate, respectively, after controlling for somatosensory, nociceptive, and salience effects, and concluded that the “core” human vestibular network likely consists of OP2, hMST, PF and PFcm, and CSv. These areas were affirmed via tractography, GVS, and resting-state functional connectivity (RSFC) based methods by Raiser et al.14, who also noted that the connectivity of this network is interhemispheric, predominantly right-lateralized, and characterized by demonstrable RSFC between homotopic regions.
More recent efforts, however, have shown that the core vestibular network is structurally15 and functionally16 interconnected with areas subserving visuospatial processing, arousal and attentional modulation (e.g., anterior insula17,18,19), sensory gain control, proprioceptive (supramarginal gyrus, SMG20,21), sensorimotor (SMG and cingulate cortex22,23), cognitive-perceptual24, and affective processes (SMG, subgenual cortex, and anterior insula25,26,27,28,29). Additionally, cerebral potentials, evoked by both naturalistic and artificial vestibular stimulation, are generated not only in the parieto-insular and temporoparietal cortex of the “core” cortical vestibular system, but also in the cerebellum, frontal-prefrontal, superior parietal, and temporal cortices, as well as the posterior fossa30. Vestibular function may therefore be linked with egocentric orientation and motor planning through body representation and ownership31,32. Additionally, visuospatial memory, navigation, motion perception and even object-based mental image transformations have also been shown to require processing by vestibular system substrates24, and all of these processes can be disrupted in cases of vestibular dysfunction. Indeed, vestibular functioning has been shown to involve the integration of multiple sensory modalities33, and syndromes such as persistent postural-perceptual dizziness (PPPD) and post-concussive vestibular dysfunction (PCVD) have been associated with maladaptive visual and visuospatial processing34,35,36,37. Furthermore, vestibular manipulation elicits affective responses38,39 and vestibular dysfunction may induce or exacerbate anxiety, depression, and other affective conditions33,40 or, conversely, can be modulated by affective conditions such as state and trait anxiety41. Neuroimaging research which incorporates not only cortical areas but also structures in the basal ganglia, thalamus, and posterior fossa would therefore contribute considerably to vestibular systems neuroscience and patient care. Large neuroimaging consortia comprised of datasets from both normative adults and adolescents, including the Human Connectome Project42, UK Biobank43, and Adolescent Brain Cognitive Development studies44, as well as those with mild traumatic brain injury, such as the Long-Term Impact of Military-Relevant Brain Injury Consortium-Chronic Effects of Neurotrauma Consortium, or LIMBIC-CENC, effort45,46,47, are available for comprehensive exploration and hypothesis testing. To date, however, no neuroimaging atlas offers the extensive coverage necessary for researchers to explore vestibular system-associated connectivity across the cortex, subcortical structures, cerebellum, and brainstem. With source validation, such coverage would also afford validation of fMRI-based vestibular research using electroencephalography (EEG) and functional near-infrared spectroscopy (fNIRS), which, while limited in spatial resolution relative to fMRI and generally constrained to cortical areas, do allow naturalistic head movements in experimental contexts48.
The present paper attempts to address this omission by provisioning a compilation of volumetric brain atlases in MNI stereotactic space which, in composite, comprises the entirety of the brain. It is hoped that further development and refinement of this compilation will be supported by the neuroimaging community; recent research, for example, indicates that the OP2 region may consist of functional49 and structural15 subdivisions, such as the posterior insular complex, which exhibit distinct connectivity patterns, and these subdivisions may need to be included in future versions of the compilation. Thus, the present version (denoted Eagle-449 to indicate that it includes 449 regions of interest) represents an initial effort toward providing an important resource for research into vestibular function and dysfunction and the expanding list of regions functionally associated with the vestibular system.
Methods
Generation of the vestibular atlas
Six parcellations were leveraged for this compilation, including the Eickhoff Anatomy atlas, which is a primary component of the JuBrain/SPM Anatomy Toolbox (https://github.com/inm7/jubrain-anatomy-toolbox)50,51,52; the SUIT anatomical cerebellar parcellation by Diedrichsen et al. (https://github.com/DiedrichsenLab/cerebellar_atlases/tree/master/Diedrichsen_2009)53; anatomical parcellations of the thalamus54 and hypothalamus55 by Najdenovska et al.56 and Neudorfer et al.57 respectively; and divisions of the brainstem and diencephalon provided as part of the Brainstem Navigator template58,59,60,61,62,63,64. All cortical areas not included in the Eickhoff parcellation were obtained from the Brainnetome atlas (https://atlas.brainnetome.org) by Fan et al.65,66,67,68,69. All atlases were resampled to MNI152 stereotactic space, if necessary, registered to the 1 mm isometric MNI152 T1 template (version 2009c) using 3-dof linear registration, inspected and corrected for overlapping voxels, and masked against the MNI152 white matter and cerebrospinal fluid templates. “Orphan” voxels, defined as very small voxel clusters which were not contiguous with a larger cluster in-plane or within adjacent slices, were then removed using the AFNI program 3dmerge70, which performed voxel clustering using a maximum inter-voxel connection radius of 1.7 mm. Finally, “liminal” voxels, defined as contiguous but thin edges of 1–4 voxel thickness, and which were usually the result of remnant ROI edges, often in occipital cortex, following subtraction of other atlases from the Brainnetome parcellation, were manually removed by editing in AFNI (Fig. 1).
Several ROIs identified as “vestibular” by Eickhoff6,7, zu Eulenberg8,9, and others14,15,71,72, including OP2/PIVC + , the posterior insular complex (PIC), visual cingulate (CSv), somatosensory areas 2 v and 3aV, premotor area 6, and inferior parietal areas IPS3, PF, and PFcm, as well as cortical and subcortical structures subserving “multimodal vestibular” or “extended vestibular” areas which are responsive to vestibular stimulation but perform non-vestibular-specific functions, such as spatial localization and recall, visuo-vestibular processing, integration of somatosensory and motor information, and representation of peri-personal space, including the medial temporal lobe, insula, precuneus, and temporal lobe15,16, were well-represented in the Eickhoff-Indovina or Brainnetome parcellations. These are presented in Table 1.
Additional preprocessing details for each parcellation are provided below. For a comprehensive list of all ROIs obtained from each atlas, as well as atlas labels, ROI values, and ROI size, refer to Supplementary Tables – Atlas Labels. All preprocessed parcellations, ROI label files (also known as lookup tables or LUTs), and preprocessing code have been made available on the Neuroimaging Informatics Tools and Resources Collaboratory Resources Registry (NITRC repository)73. The compiled atlas is presented as Fig. 2.
Cortical parcellation
Eickhoff-Juelich anatomical cortical parcellation (Atlas A1)
The Eickhoff-Juelich (JuBrain) cytoarchitectonic parcellation is comprised of several known vestibular ROIs, including divisions of the parietal operculum, such as OP2 and secondary somatosensory cortex6,7,74, primary somatosensory cortex, including area 3a75,76, visual area MT/V577, superior parietal cortex, including area 778,79, and inferior parietal cortex, including areas PF and PFcm80,81. A number of ROIs encompassing the hippocampus82, insula83, amygdala82, cingulum84, orbitofrontal cortex85, and visual areas86,87,88,89,90 were also included from this parcellation. 102 JuBrain atlas ROIs, along with left- and right-hemisphere posterior insular complex (PIC), derived from the disjunction of the Brainnetome atlas BA40rv and Eickhoff atlas OP2 ROIs and provided by Indovina et al.15, were incorporated as Atlas A1. To create Atlas A1, the left (L) and right (R) PIC ROIs, as well as SUIT cerebellar (Atlas A3), thalamic (Atlas B1), and brainstem and diencephalon ROIs (atlases B2 and B3) were subtracted from other JuBrain atlas regions.
Brainnetome structural-functional cortical parcellation (Atlas A2)
The JuBrain parcellation does not comprise the entire cerebral cortex, and some areas commonly associated with vestibular processing, including hMST and visual cingulate (caudal Brodmann area 23), are not well-defined. Consequently, all cortical ROIs not defined in Atlas A1 were generated from the Brainnetome atlas, which is premised on the functional and structural connectivity of cortical regions, as Atlas A2. To avoid overlaps with other parcellations, a binary mask comprised of atlases A1, A3 (cerebellar), B1 (thalamic), B2 (brainstem), and B3 (diencephalon) was subtracted from the Brainnetome parcellation. As a result of this subtraction, some ROIs conventionally included in the Brainnetome parcellation, including occipitopolar cortex (OPC), medioventral (cLinG) and lateral occipital cortex (iOccG), L lateral amygdala (lAmygL), and R entorhinal area 28/34 (A28/34), contain zero voxels in the final Atlas A2. However, these regions are indexed in the LUTs for comprehensiveness, for a total 229 Atlas A2 ROIs.
The Brainnetome parcellation does not contain cerebellar ROIs, but does define several ROIs from subcortical structures, including cingulate, caudate, putamen, globus pallidus, and nucleus accumbens, and these structures are also included in Atlas A2. Additionally, some larger cortical areas, such as superior parietal area hIPS3 and postcentral area 2, are more restrictively defined in the JuBrain/A1 atlas, and portions of these areas which are contiguous with, but do not overlap with, A1 areas are also included in Atlas A2. Finally, Atlas A2 contains liminal remnants of other cortical regions which were not defined as part of other atlases, but were too large and contiguous to be considered “orphan” voxel clusters. These remnants are typically found in the occipital lobe in the vicinity of the parieto-occipital sulcus.
Cerebellar parcellation
Diedrichsen-SUIT anatomical parcellation (Atlas A3)
The SUIT cerebellar atlas is premised on anatomical delineations of cerebellar structures and is provided as part of the SUIT Toolbox. It was incorporated into this compilation, without modification, as Atlas A3, and is comprised of 34 ROIs. ROIs included in the SUIT parcellation were subtracted from other atlases, as noted elsewhere in this section.
Subcortical and brainstem structures
Najdenovska anatomical thalamus parcellation (Atlas B1)
Many atlases include a delineation of the thalamus which is based on the functional connectivity analyses by Behrens et al.91,92. Our present atlas compilation, however, is primarily based on anatomical delineation of cerebral structures, and, for consistency, we opted to include the thalamic parcellation by Najdenovska et al.56 as Atlas B1, comprised of 14 ROIs. Brainstem and diencephalon ROIs (atlases B2 and B3) overlapped with the edges of some of these thalamic areas by approximately 1–3 voxels, and were subtracted from Atlas B1 accordingly. A mask comprised of ROIs from Atlas B1 was also subtracted from atlases A1 and A2, as previously noted, as well as from Atlas B4 (hypothalamus). Lateral and medial geniculate nuclei (LGN, MGN) were included with diencephalic regions (Atlas B3).
Brainstem Navigator (brainstem and diencephalon: Atlases B2 and B3)
Brainstem and diencephalon ROIs were incorporated into this atlas compilation as Atlases B2 and B3, respectively. Some minor overlaps of 1–2 voxels were noted among these ROIs; accordingly, each pair of ROIs was assessed for voxel overlap, and overlapping voxels were retained from the smaller, and subtracted from the larger, of the pair. A mask of the Atlas B2 and B3 ROIs was created following this procedure and subtracted from atlases A1 and B1, as previously noted, as well as from Atlas B4 (hypothalamus). The final B2 atlas was comprised of 66 ROIs, and the B3 atlas of 6 ROIs, including L and R LGN and MGN and L and R subthalamic nuclei. Notably, the vestibular nuclei complex, an important component of the vestibular system, is included in Atlas B2 (Table 1).
Neudorfer anatomical hypothalamus parcellation (Atlas B4)
The detailed hypothalamic parcellation by Neudorfer and colleagues57 is originally defined in 0.5 mm isometric space and required additional processing for inclusion in the 1 mm compilation. As part of this process, larger ROIs, such as the L and R mamillary bodies, bed nuclei of the stria terminali, and L and R nucleus basalis were retained; however, the final 1 mm resolution, relative to the size of several other nuclei of interest, including the medial preoptic, paraventricular, periventricular, dorsal periventricular, ventromedial, dorsomedial, supraoptic, suprachiasmatic, tuberomammillary, and arcuate nuclei, as well as the lateral, anterior, and posterior hypothalamus, necessitated their merger into L and R “hypothalamus, not otherwise specified (NOS)” ROIs. Downsampling to the 1 mm isometric grid was performed with the AFNI program 3dfractionize; various 3dfractionize clipping levels (percent voxel occupation) from 0.1 (10%) to 0.8 (80%) were assessed, and a clipping level of 40% ultimately selected, as this yielded ROI borders which most closely matched those in the original, 0.5 mm isometric grid. Minor overlaps between the Neudorfer hypothalamus, Brainstem Navigator, and Najdenovska thalamus ROIs were resolved by subtraction of binary masks representing atlases B1, B2, and B3 from the downsampled ROIs. Eight ROIs remained after this subtraction and are included in the compilation as Atlas B4. A partial view of the original Neudorfer et al. and final Atlas B4 ROIs, following downsampling and subtraction of brainstem and diencephalon ROIs (Atlas B2 and B3), is provided as Supplementary Figure 2.
Data Records
The Eagle-449 atlas compilation has been made available on NITRC73, under an open/attribution license, in the form of Gzipped, NIfTI-format volumetric datasets for atlases a1-a3 and b1-b4; text-format lookup tables (LUTs) for each atlas based on assigned ROI value; a spreadsheet containing ROI values, abbreviations, full labels, ROI group (e.g., somatomotor, orbitofrontal, cerebellum); and suggested ROI labels and ROI ordering for use with the CONN Toolbox73. The present version, v449, resides in the EAGLE449 folder on the associated GitHub repository, and it is expected that future iterations of the atlas compilation, which will be based on additional contributions from vestibular neuroimaging researchers, will be placed in separate subfolders in the same repository.
Technical Validation
Participants and MRI acquisitions
The present study evaluated rsfMRI data from a total 821 datasets from young, healthy adult subjects (402 male, 419 female) included in the HCP S500 (n = 269), S900 (n = 350), and S1200 (n = 202) public data releases. Additional information on HCP inclusion and exclusion criteria may be found in Van Essen42. One rsfMRI acquisition, acquired using a Siemens Skyra 3 T MRI (1200 frames at TR = 720msec, 72 slices, TE = 33.1msec, FA = 52°, 2 mm isometric voxels, 208 × 180 mm FOV)93, previously denoised by the HCP using the FIX denoising pipeline and normalized to the standard MNI152 brain template (REST1_LR_hp2000_clean), as well as a preprocessed T1-weighted anatomical image, was obtained for each participant. The FIX pipeline includes application of a highpass filter at 2000 sec, motion regression, and regression of noise components identified via independent components analysis94. Only data preprocessed with the most recent HCP preprocessing workflow, version r227, were included. Subject ages ranged from 22 to 36 years (see Table 2).
Data preprocessing
Given the denoising and normalization already applied to the subject T1 and resting state data as part of the FIX-denoising process, the current workflow, performed in the CONN Toolbox version 21b, was limited to minimal preprocessing standards and consisted of tissue segmentation to obtain mean white matter and CSF signal, minimal correction or residual subject motion and identification of framewise outliers, ordinary least-squares regression of white matter, CSF, and motion noise sources, and smoothing of residual data using a 4 mm FWHM Gaussian kernel as well as an 8–250 mHz bandpass. Quality assurance results are provided as Supplementary Figure 1– Quality Control.
Functional connectivity analysis
To test the atlas compilation, semipartial correlations were computed, using the CONN Toolbox, between the right (R) OP2, R PIC, and all 447 remaining ROIs from the seven component parcellations. The semipartial correlation coefficient, or SPCC, between ROI pairs controls for other ROIs’ mediating effects on those pairs, and thus represents an estimate of the “direct” or “effective” connectivity between them95,96,97. For this analysis, the Fisher-transformed SPCC, Z(i, j), was computed for each pair of ROIs using the ROI timeseries Ri (t) and the matrix β of multivariate regression coefficients:
where β(i, j) is estimated by ordinary least squares:
and the normalized SPCC,
Is computed as
The matrix Z of all SPCCs was then subjected to a one-sample t-test and a “threshold-free cluster enhancement” (TFCE) score98 computed for each connection and for groups of neighboring connections (subgraphs or “clusters”) from the resulting matrix of t-statistics. Hypothesis testing proceeded by comparing the t-value for each connection with an estimate of a TFCE “extent” parameter at various thresholds and comparing the results with an expected null distribution of TFCE values estimated using 1000 permutations of the original data. This procedure yielded a “peak-level” familywise error rate (FWE)-corrected p-value, representing the likelihood of detecting one or more connections with the observed TFCE value or larger over all connections in Z. “Peak-level” uncorrected and false discovery rate (FDR)-corrected p-values were also estimated for each local extremum in the TFCE score matrix, representing the likelihood of observing its TFCE score, or larger, in at least one other randomly-selected extremum in the TFCE score matrix, or the expected proportion of false discoveries for that extremum’s TFCE score or greater97,99. For hypothesis testing, the current TFCE results were corrected for multiple comparisons at p(FWE) ≤0.05.
The CONN Toolbox computes TFCE using an exact integration method. Note that the definition of a “cluster” of connections for TFCE is partly dependent on ROI sorting, and this sorting algorithm may be implemented manually or through hierarchical clustering based on anatomical proximity or functional similarity100. For the present (exploratory) purposes, ROIs were sorted by anatomical or functional domain, including vestibular or extended vestibular based on prior publications14,15, or orbitofrontal-prefrontal, frontal, somatomotor, somatosensory, visual, superior or inferior parietal, superior or middle-temporal, medial temporal, insular, and cingulate. FWE, FDR, and uncorrected p-values for connection clusters and individual connections did not differ substantially between this manual sorting and the default CONN hierarchical algorithm; other algorithms may, however, be preferable101.
Results
Semipartial correlations, corrected for multiple comparisons using TFCE, are shown for the R OP2 and R PIC seed ROIs in Fig. 3, 4, respectively, and results provided for first-order connections to these ROIs are presented in Table 3. R OP2 connections in this normative cohort included R parietal area PFcm, OP1, OP3, insular areas G, Ig1, and Ig2, PIC, and rostrodorsal area 40 (40rd/area PFt), as well as L OP2. Connections with R PIC included R PFcm, PF, OP1, OP3, OP2, rostroventral area 40 (area PFop), and rostrodorsal area 40/PFt, as well as L OP2. Note that, although TFCEs for the R OP2:R PFcm, R OP2:R 40rd/PFt, R PIC:40rd/PFt, and R PIC-L OP2 parent clusters were statistically significant at p(FWE)≤0.05 and p(FDR)≤0.05, these associations did not survive multiple comparisons correction at the connection level. These results compare favorably with the structural findings of Indovina et al.15 except that no connection between R PIC and L motor area 4a was observed in the current results, but were reported by Indovina et al., and a connection between R OP2 and ipsilateral PFt was observed in the current results, but was not reported by Indovina et al. Additionally, a suprathreshold number of streamlines originating from, or terminating in, R OP2 or R PIC, were observed in the latter study which were not supported, in terms of functional connectivity, here. Neither R OP2 nor R PIC exhibited connectivity with thalamic, brainstem, or cerebellar nuclei. In both cases, however, connectivity was predominantly localized to the right hemisphere, and characterized by homotopic connections with the seed ROIs. All semipartial correlations were positive, indicating in-phase relationships between the seed and target ROIs.
Statistics for all extant connections following TFCE correction are also provided as Supplementary Table 2. Several interesting connections were observed between conventional vestibular regions and areas not typically included in the “core” vestibular network, including R somatosensory area 2 and ipsilateral rostral hippocampus (connection t = +2.3800, p(FDR) = 0.0176, but p(FWE) = 0.3157), R area 7ip and ipsilateral laterobasal amygdala (connection t = +1.8700, but p(FDR) = 0.0623 and p(FWE) = 0.5625), and extensive interconnectivity between cortical vestibular areas 37 dl/hMST and 7ip and visual areas FG2, FG4, lateral-anterior and lateral-posterior area hOc4, and between hOc5, postcentral area 2, and regions of the cerebellum, including L crus, R V, VI, VIIb, and VIIIa. Additionally, several cortical and subcortical vestibular areas, including area PF and the vestibular nucleus complex, were functionally connected with subcortical and brainstem nuclei, such as the subcoeruleus, laterodorsal tegmental nucleus, medial parabrachial nucleus, globus pallidus, and caudal-dorsal cingulate area 24.
Limitations of the validation process
The current version, v449, of the atlas compilation, as well as its technical validation, incurs several caveats. With respect to the compilation itself, it is important to note that the Brainnetome parcellation (Atlas A2) serves as a “catch-all” for cortical areas not included in Atlas A1, and, as previously noted, includes liminal remnants of Atlas A1 ROIs. Consequently, Atlas A2 should not be used independently of Atlas A1, and future versions of the atlas compilation may substitute other anatomically-derived cortical parcellations for, or in addition to, the Brainnetome source. Investigators are also encouraged to consider whether the Brainnetome parcellation comports with their research aims, as some cortical parcellations, including functionally-defined parcellations such as that of Gordon et al.102 may be more suitable for specific purposes. Additionally, based on recent analyses which have delineated functional subdivisions within vestibular areas, including OP2, it appears likely that these areas, as currently defined, are composites of subregions which subserve differential vestibular functions49.
“Validation” of the current atlas compilation was conducted by computing semi-partial correlation coefficients between right-hemisphere OP2 and PIC seeds and all other ROIs, and comparing the results to previous peer-reviewed findings concerning the connectivity of these regions14,15. While these qualitative comparisons were favorable in that they replicated prior results, it should be noted that there are numerous ways, in addition to semi-partial correlation, to assess RSFC. Analyses which leveraged “classical” Pearson correlations failed to resolve network structures, such as connections between vestibular nuclei and other areas, which would be expected based on prior anatomical and structural findings in humans and lower primates, and the technical validation process therefore leveraged semi-partial correlations in order to control for the influence of all other connections with the seed and target ROIs. Due to the nature of semi-partial correlation, however, removing one or more of these regions may effect a new network topology. Finally, the topologies resolved in this validation process are likely incomplete, due not only to inherent issues of multiple comparisons (which were addressed to some degree by the use of TFCE), but potentially due to suppressed effect sizes in the connectivity of the subcortical regions of HCP datasets due to MRI acquisition parameters, which have been noted as problematic by Risk and colleagues102,103.
Usage Notes
The entirety of the dataset may be downloaded from GitHub (https://github.com/EmoryPcvdLab/EagleVAC) or NITRC73. The current version, v449, resides in the EAGLE449 folder of the GitHub repository. As the present authors did not have a role in the acquisition, processing, or distribution of the source atlases, investigators who leverage the atlas are requested to cite these original sources as described in the README file of the repository. It is also requested that investigators consider contributing to iterative refinements of the EAGLE atlas compilation, including, but not limited to, correction of errors, modifications to ROIs, and newly-derived subdivisions of existing vestibular areas documented in published, peer-reviewed research. Finally, investigators should be aware of the number of simultaneous tests (number of ROIs) relative to their sample size when leveraging these parcellations.
Code availability
The BASH shell script used for merging of source atlases has also been made available on the GitHub repository as merge_code.bash. Investigators who wish to replicate the workflow will need to download the original source atlases and adjust file paths in the shell script to point to them. The script requires a recent version of the AFNI suite70.
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Acknowledgements
The present work was supported by NIH/NINDS grant R01NS119683 and a seed grant from the Emory University Department of Radiology and Imaging Sciences. The authors would also like to thank Drs. Iole Indovina and Peter zu Eulenburg for providing several ROI templates, including OP2 and PIC.
Data were provided in part by the Human Connectome Project, WU-Minn Consortium (Principal Investigators: David Van Essen and Kamil Ugurbil; 1U54MH091657) funded by the 16 NIH Institutes and Centers that support the NIH Blueprint for Neuroscience Research; and by the McDonnell Center for Systems Neuroscience at Washington University.
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All authors contributed substantively to the work presented in this paper. J.W.A. and R.K.G. jointly conceived, designed, and supervised implementation of the study and provided clinical interpretation of the results. J.L.S. compiled the original source atlases, conducted the processing and quality assurance workflows for merging of the source atlases, and performed the technical validation using Human Connectome Project data. V.A., J.W.A. and R.K.G. supervised the analysis and edited the manuscript.
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Smith, J.L., Ahluwalia, V., Gore, R.K. et al. Eagle-449: A volumetric, whole-brain compilation of brain atlases for vestibular functional MRI research. Sci Data 10, 29 (2023). https://doi.org/10.1038/s41597-023-01938-1
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DOI: https://doi.org/10.1038/s41597-023-01938-1