• This coordinate-based meta-analysis included voxel-based morphometry (VBM) studies and resting-state voxel-based pathophysiology (VBP) studies of blood flow, glucose metabolism, regional homogeneity, and amplitude of low-frequency fluctuations (ALFF) and fractional ALFF (fALFF). (psychiatryonline.org)
  • We performed an activation likelihood estimation meta-analysis on voxel-based morphometry studies reporting decreased grey matter in 14 neurological and 10 psychiatric disorders, and compared the regional and network-level alterations for these two classes of disease. (nih.gov)
  • Coercive harming significantly increased activation in the amygdala, hippocampus, orbitofrontal cortex, and dorsolateral prefrontal cortex (dlPFC). (researchsquare.com)
  • However, ecstasy-polydrug users displayed significant increases in oxygenated haemoglobin (oxy-Hb) from baseline compared to controls at several voxels relating to areas of the inferior right medial prefrontal cortex, as well the right and left dorsolateral prefrontal cortex. (ljmu.ac.uk)
  • However, there were significant differences in oxy-Hb level change at several voxels relating to the left dorsolateral prefrontal cortex (DLPFC) and right medial prefrontal cortex (PFC) during the CWFT, indicating increased cognitive effort in ecstasy users relative to controls. (ljmu.ac.uk)
  • Many neuroimaging studies have used the verbal n-back task during functional MRI (fMRI) to explore brain activation associated with working memory processing, and n-back task performance is associated with the activations of bilateral frontal and cortical regions [ 6 ]. (biomedcentral.com)
  • although activations tend to be more bilateral at younger ages (e.g. (biorxiv.org)
  • Based on previous findings, we expected that these tasks would result in activation of bilateral temporal and inferior frontal cortices. (ajnr.org)
  • Relative to cross-class Foils, Transitive and Equivalence relations requiring inferential judgments elicited bilateral activation in the anterior hippocampus while Symmetrical relations elicited activation in the parahippocampus. (biomedcentral.com)
  • Relative to each derived relation, Foils generally elicited bilateral activation in the parahippocampus, as well as in frontal and parietal lobe regions. (biomedcentral.com)
  • A linear regression identified regional activations to p(Stop), each in correlation with SSRT and motor urgency. (jneurosci.org)
  • A mediation analysis showed that right SFG activation to conflict anticipation mediates the correlation between SSRT and motor urgency bidirectionally. (jneurosci.org)
  • Bonhoeffer and Grinvald, 1996 ), using identical schemes of stimulation and correlation analyses. (jneurosci.org)
  • 2) Is there a correlation between activation of sensorimotor-related brain regions and three clinical measurement scales of ankle function and disease severity in patients with chronic ankle instability? (bvsalud.org)
  • Spearman analysis was performed to explore the correlation between activation regions and the three clinical assessment scales. (bvsalud.org)
  • CLINICAL RELEVANCE: Because there was a positive correlation between the neural activity in sensorimotor-related regions during plantarflexion and clinical severity, clinicians might one day be able to help patients who have chronic ankle instability with neuromuscular rehabilitation by applying electrical stimulation to specific targets (such as S1M1 and the supplementary motor area) or by increasing activation of sensorimotor neurons through ankle movement. (bvsalud.org)
  • Our tool is the functional holography (FH) method, originally developed for analyzing electrophysiological recordings and based on analyzing the voxel-voxel correlation matrices. (mssm.edu)
  • Activation of the ventromedial prefrontal cortex, posterior cingulate cortex and right superior frontal gyrus (SFG) during conflict anticipation correlated negatively with the SSRT. (jneurosci.org)
  • Here, in a large sample of young adults, we showed that activation of the right superior frontal gyrus (SFG) during conflict anticipation is positively correlated with the capacity of inhibitory control and negatively with motor urgency in the stop signal task. (jneurosci.org)
  • Under placebo, compared to controls, individuals with ASD had atypical brain activation in response inhibition regions including the inferior frontal cortex, premotor regions and cerebellum. (biomedcentral.com)
  • Also, within ASD individuals, brain functional differences were shifted significantly towards control levels during response inhibition in the inferior frontal and premotor cortices. (biomedcentral.com)
  • In 31 of 34 patients, activation was identified in the inferior frontal gyri or middle frontal gyri or both in Brodmann areas 9, 44, 45, or 46, unilaterally or bilaterally, with one or more of the tasks. (ajnr.org)
  • In the tabulation of activation from word-generation tasks, five contiguous coronal sections encompassing the middle and inferior frontal gyri were examined. (ajnr.org)
  • We identified activation in the left inferior frontal cortex, left superior temporal sulcus, and left inferior parietal lobule during the attitude attribution task, compared to the gender matching task. (psychiatryinvestigation.org)
  • In contrast, exploring regions reduced by memantine, we found significant reduction of activations within right lingual gyrus and left superior frontal gyrus in comparison between 2-back and 0-back test. (biomedcentral.com)
  • However, another network implicated in high-level cognition- the domain-general multiple demand, MD, network-is robustly present in both right and left frontal lobes, suggesting that EG's left frontal cortex is capable of supporting non-linguistic cognitive functions. (biorxiv.org)
  • In the elderly control volunteers, activation during memory encoding was observed in medial and lateral temporal lobe structures (fusiform, parietal and occipital parts, and hippocampal formation) and in the frontal cortex, as reported previously in studies of young control volunteers. (ajnr.org)
  • We retained voxels with p values less than 0.05 in a voxel-level family-wise error correction. (bvsalud.org)
  • The changes in BOLD signal and blood volume, which are most tightly correlated with the periodic stimulation, peak at the site of neuronal activation. (jneurosci.org)
  • These results contribute to the understanding of the hemodynamic mechanisms underlying the BOLD signal and also suggest analysis methods, which improve the spatial localization of neuronal activation with both fMRI and ORIS. (jneurosci.org)
  • Our results show that the FH analysis performed for a single trial reveals interesting motifs, even in a simple motor task: unilateral hand movements yielded two clusters, one in the contralateral M1 region showing neuronal activation and one in the ipsilateral homologues region showing deactivation. (mssm.edu)
  • Conclusion: Ecstasy-polydrug users show increased neuronal activation in the prefrontal cortex compared to non-users. (ljmu.ac.uk)
  • This technique relies on the fact that cerebral blood flow and neuronal activation are coupled. (theinfolist.com)
  • We studied motor task fMRI activation and resting-state functional connectivity (rsFC) in a 61-year-old right-handed male patient who suffered hemiparesis and physical weakness in the right upper limb, 2 years after his acute insult, pre- and post-treatment of 60 daily HBOT sessions. (frontiersin.org)
  • First level task-fMRI analyses We performed further analyses with FSL version 6.0.1. (ipskampprinting.nl)
  • Importantly, within the cortical regions that were active for both complex movements, MVPA could accurately classify different patterns of activation for the sequential rhythm and sequential order tasks. (frontiersin.org)
  • with their topographies coarsely overlying the primary sensory cortices of the relevant stimulus modality, suggesting that the activation of specific cortical regions appears on the scalp surface as different delta brush distributions. (elifesciences.org)
  • Coordinate-based meta-analysis identified spatially convergent structural (VBM) and functional (VBP) abnormalities in major depression. (psychiatryonline.org)
  • Comparing the two activity patterns from the scans a month apart, the ICC for each voxel of the brain was poor (the median ICC was at best 0.35, which is low, and that was in the most favorable of the several conditions of the task. (discovermagazine.com)
  • 2006) study might suggest they are seeking to identify similar activation patterns. (savedelicious.com)
  • Applying an unbiased analysis, in which spatiotemporal activity patterns in one brain were used to 'model' activity in another brain, we found a striking level of voxel by voxel synchronization between individuals during free viewing of an audio-visual movie. (princeton.edu)
  • In particular, the use of videotaped violent scenes can serve as the ideal stimulus for assessing activation patterns in response to violence. (psychiatrictimes.com)
  • In this regard, the work of Paul Ekman, Ph.D., and Richard Davidson, Ph.D., using electroencephalogram recordings while subjects viewed gruesome films indicated asymmetries in activation patterns in the anterior regions of the left and right hemispheres (Davidson et al. (psychiatrictimes.com)
  • and "Do perceptions of sounds correlate with voxel patterns in the somatosensory cortex? (auntminnieeurope.com)
  • In addition to measuring the blood oxygenation level dependent (BOLD) signal using fMRI, the authors also used a technique known as "representational similarity analysis" (RSA) to characterize the relationship between different frequencies in each cortex by looking at the activation patterns across multiple voxels. (auntminnieeurope.com)
  • Ciccia and colleagues (2006) previous analysis of the group data looked at the brain activation patterns that persisted across all study participants. (inquiriesjournal.com)
  • Activation patterns where then compared according to question difficulty to discover which brain areas are activated by different levels of social judgments (Ciccia, 2006). (inquiriesjournal.com)
  • The image analysis for the present study considered each participants brain activation patterns rather than grouped results as discussed by Ciccia and colleagues (2006). (inquiriesjournal.com)
  • Coordinates showing significant activation and/or connectivity differences between BD participants and controls during resting-state, emotional, or cognitive tasks were extracted. (nature.com)
  • Our results demonstrate that sequential rhythm and sequential order tasks were partially dissociable based on activation differences. (frontiersin.org)
  • In the basal ganglia, however, overlapping activation for the sequential rhythm and sequential order tasks, which was found in classic motor circuits of the putamen and ventro-lateral thalamus, could not be accurately differentiated by MVPA. (frontiersin.org)
  • We previously demonstrated that reducing serotonin by acute tryptophan depletion (ATD) shifts differences in brain function during performance of EF tasks towards control levels. (biomedcentral.com)
  • We conducted a pharmacological magnetic resonance imaging study, using a randomized double-blind crossover design, to compare the effect of an acute dosage of 12.5 mg tianeptine and placebo on brain activation during two EF tasks (of response inhibition and sustained attention) in 38 adult males: 19 with ASD and 19 matched controls. (biomedcentral.com)
  • More studies are needed to optimize the retest reliability of fMRI activation for memory tasks. (discovermagazine.com)
  • In patients performing two iterations of the letter word-generation tasks, test-retest reliability was quantified by using the concurrence ratio (CR), or the number of voxels activated by each iteration in proportion to the average number of voxels activated from both iterations of the task. (ajnr.org)
  • In previous reports, many different language tasks have been used, and activation in multiple lobes of the brain has been identified. (ajnr.org)
  • This study evaluated human Blood Oxygen Level-Dependent (BOLD) responses in primary and higher-order olfactory regions of older adults, using odor memory and odor identification tasks. (dovepress.com)
  • Paired t -tests were used to compare differences in the degree of activation between odor identification and odor memory tasks within individuals. (dovepress.com)
  • We used functional magnetic resonance imaging (MRI) to examine brain activation during attitude attribution task as compared to gender matching tasks. (psychiatryinvestigation.org)
  • The completion of these tasks allowed for a clear overlay of the functional imaging data over the structural data and the identification of activation in pre-specified regions of interest (Frackowiak, Friston, Frith, Dolan, Price, Zeki, Ashburner, & Penny, 2004). (inquiriesjournal.com)
  • We speculate that methods that measure activation of brain structures during memory tasks may be used to measure such changes in function, even before morphologic changes are apparent. (ajnr.org)
  • Regression analysis revealed that recency of ecstasy use was a significant predictor of oxy-Hb increase at two voxels over the right hemisphere after controlling for alcohol and cannabis use indices. (ljmu.ac.uk)
  • By comparing the spatial and temporal characteristics of the BOLD response over the barrel with those of the two ORIS signals, we examined whether a positive BOLD signal reflects indeed a washout of deoxyhemoglobin or alternatively a blood volume effect, i.e., a relative change of the intravascular water fraction in a given voxel. (jneurosci.org)
  • During sustained attention, individuals with ASD had decreased brain activation in the right middle temporal cortex, right cuneus and left precuneus. (biomedcentral.com)
  • High-level language processing is supported by a left-lateralized fronto-temporal brain network. (biorxiv.org)
  • BOLD activation was modelled by convolving all regressors with a canonical hemodynamic response function and its temporal derivative. (ipskampprinting.nl)
  • This temporal information was used to individualize the functional imaging analysis in SPM. (inquiriesjournal.com)
  • The purpose was to determine the feasibility of functional MR imaging during a learning task in healthy elderly volunteers and in patients with Alzheimer's disease and to test our hypothesis that brain activation is decreased in the medial temporal lobe (MTL) memory system in patients with Alzheimer's disease compared with control volunteers. (ajnr.org)
  • Preprocessing analysis of the data included: slice timing correction, realignment and unwarping, co-registration, normalization to the MNI T1 template (Montreal Neurological Institute), and smoothing with a 6 mm isotropic Gaussian kernel. (inquiriesjournal.com)
  • These preprocessing steps allow SPM to combine the functional and structural imaging data into a single image for analysis. (inquiriesjournal.com)
  • Clusters with voxel numbers greater than 10 were retained. (bvsalud.org)
  • The secondary analyses identified portions of the subgenual cingulate cortex, hippocampus, amygdala, and putamen as demonstrating convergent abnormalities. (psychiatryonline.org)
  • In other words if an individual shows a huge activation of the hippocampus in one session, it doesn't mean that will happen whenever they get scanned. (discovermagazine.com)
  • odor memory) contrasts had several areas of significant activation, including many of the classical olfactory brain regions as well as the hippocampus. (dovepress.com)
  • Activation observed in the hippocampus to nodal-dependent derived conditional relations (Transitive and Equivalence relations) highlights its involvement in maintaining relational structure and flexible memory expression among stimuli within a class (A ≡ B ≡ C). (biomedcentral.com)
  • Four parallel, independent meta-analyses were calculated using the revised activation likelihood estimation algorithm: all experiment types, all resting-state experiments, all cognitive experiments, and all emotional experiments. (nature.com)
  • The algorithm selects the relevant voxels using a dendrogram clustering method combined with a unique standard deviation (STD) filter, identifying the voxels with high STD correlations. (mssm.edu)
  • A highly selective response to food in human visual cortex revealed by hypothesis-free voxel decomposition. (mit.edu)
  • Moreover, our results demonstrate that the unitary nature of conscious experience in fact consists of temporally interleaved and highly selective activations in an ensemble of specialized regions, each of which 'picks-up' and analyses its own unique subset of stimuli according to its functional specialization. (princeton.edu)
  • Regression analyses showed that frequency of ecstasy use, total lifetime dose and amount used in the last 30 days was significant predictors of oxy-Hb increase at several voxels after controlling for alcohol and cannabis use indices. (ljmu.ac.uk)
  • We investigate the impact of decisions in the second-level (i.e., over subjects) inferential process in functional magnetic resonance imaging on (1) the balance between false positives and false negatives and on (2) the data-analytical stability, both proxies for the reproducibility of results. (hindawi.com)
  • see, e.g., [ 1 ]) The analysis of an fMRI time course in a single subject (first-level analysis) offers some insight into subject-specific brain functioning while group studies that aggregate results over individuals (second-level analysis) yield more generalizable results. (hindawi.com)
  • For first-level analyses, Carp [ 5 ] demonstrated the large variation in the choices made in each of these different phases which impacts results. (hindawi.com)
  • for novelty encoding paradigms, the interpretation of fMRI results on a single subject level is hampered by its low reliability. (discovermagazine.com)
  • RESULTS: In the patient group, cortical activation was greater during plantarflexion than during dorsiflexion, which was different from that in the control group. (bvsalud.org)
  • Our results provide important empirical evidence for researchers in the field of cognitive control for the use of individual ROIs in the frontoparietal network for both univariate and multivariate analysis of fMRI data and serve as another step toward standardization and increased comparability across studies. (mit.edu)
  • They measured functional MRI (fMRI) signal changes following a frequency discrimination task, and used multivariate pattern analysis to validate the results. (auntminnieeurope.com)
  • Dr. Yurgelun-Todd is an expert in the application of structural and functional magnetic resonance imaging, the administration and analysis of neurocognitive tests, and the integration of the results obtained by using multiple imaging modalities combined with clinical assessment. (va.gov)
  • CONCLUSION: The results suggest that ecstasy users show increased activation in the PFC as a compensatory mechanism, to achieve equivalent performance to non-users. (ljmu.ac.uk)
  • Fractionating theory of mind: a meta-analysis of functional brain imaging studies. (wikipedia.org)
  • Quantitative meta-analyses of this literature, however, have failed to find statistically significant between-study spatial convergence, other than transdiagnostic-only effects. (psychiatryonline.org)
  • For each of these imaging techniques, the panel evaluated the following items: possible indications, technical aspects, qualitative and quantitative analysis of lung morphology and the potential interplay with mechanical ventilation. (ersjournals.com)
  • Following the intervention during trials involving the affected hand, there was an observed increase in fMRI activation in both the supplementary motor cortex (SMA) and the premotor cortex (PMA) bilaterally. (frontiersin.org)
  • Imaging for the fMRI activation study: 101 EPI volumes of 32 interleaved axial slices were acquired using a prospective motion-controlled, gradient recalled echo, echoplanar acquisition (Thesen et al. (inquiriesjournal.com)
  • This meta-analysis aims to comprehensively reassess brain activation and connectivity in BD in order to identify replicable differences that converge across and within resting-state, cognitive, and emotional neuroimaging experiments. (nature.com)
  • Bandura's social-cognitive approach and Berkowitz's cognitive-neoassociation analysis posit a role for emotional arousal as an affective tag that may facilitate lasting influences. (psychiatrictimes.com)
  • Here, we visualized activations of the cerebellum and extracerebellar regions using high-field fMRI, while we asked participants to observe and imitate images with pictures of human faces expressing different emotional states or with moving geometric shapes as control. (springer.com)
  • Studies researching this matter have skewed towards dissembling manipulation, or participants' obedience levels, neglecting the fact that agents under coercive power are also victims of coercive violence. (researchsquare.com)
  • 21 male participants) matched by age and education level. (bvsalud.org)
  • This data was then looked at in two ways: as a group image (where the 10 second decision points for all of the participants were averaged together), or as individuals (each individual participant's activation using the same ten second marker as the decision point). (inquiriesjournal.com)
  • Functional MR imaging offers the possibility to study individual participants noninvasively using the blood oxygen level-dependent technique (14) . (ajnr.org)
  • This analysis aims to undertake a critical analysis of the study's rationale, design and conclusions. (savedelicious.com)
  • Our findings provide the first evidence that tianeptine can shift atypical brain activation during EF in adults with ASD towards control levels. (biomedcentral.com)
  • A recent meta-analysis of imaging studies in nondisabled adults (16) identified several motor planning and movement execution regions on both sides of the brain that were consistently active during imagery including premotor, prefrontal, and parietal cortices, basal ganglia, thalamus, and cerebellum. (medicaljournals.se)
  • To do this, we develop a deep Siamese framework comprising three-dimensional convolution neural networks for contrastive learning based on individual-level spatial maps estimated via a fully automated fMRI independent component analysis approach. (biorxiv.org)
  • The proposed framework evaluates whether pairs of spatial networks (e.g., visual network and auditory network) are capable of subject identification and assesses the spatial variability in different network pairs' predictive power in an extensive whole-brain analysis. (biorxiv.org)
  • The cerebellar activations associated with negative emotions occurred concomitantly with activations of mirror neuron domains such as the insula and amygdala. (springer.com)
  • Concretely experiencing one's own emotions or empathizing with another's emotions involves an activation of a mirror neuron network (insular cortex, medial areas of prefrontal cortex and amygdala) [ 11 - 14 ]. (springer.com)
  • Fast, low-angle shoot functional magnetic resonance imaging (fMRI), based on the blood oxygenation level-dependent (BOLD) effect, was combined with optical recording of intrinsic signals (ORIS) and 2-deoxyglucose labeling in gerbil barrel cortex. (jneurosci.org)
  • Seed-to-voxel-based rsFC analysis using the right SMA as seed showed increased connectivity to the left posterior parietal cortex, the left primary somatosensory cortex, and the premotor cortex. (frontiersin.org)
  • 1 , 2 Functional magnetic resonance imaging (fMRI), measuring the Blood Oxygen Level Dependent (BOLD) response to neural activation in the olfactory cortex, has particularly enabled the identification of cortical and subcortical brain structures that participate in olfactory processing. (dovepress.com)
  • Specific attention was paid to functional connectivity within key brain regions, employing sophisticated analysis methods and stringent statistical controls to validate findings. (news-medical.net)
  • Joaquim Radua is a Spanish psychiatrist and developer of methods for meta-analysis of neuroimaging studies. (wikipedia.org)
  • In each case, we assigned the location of activation to Brodmann areas 9, 44, 45, and/or 46, on the basis of standard parcellation methods and standard texts (4) . (ajnr.org)
  • We use fMRI methods that have been previously extensively validated for their ability to elicit robust language responses at the individual-subject level. (biorxiv.org)
  • In this study, spatially and temporally dependent isotopic compositions from a simulated nuclear detonation and Monte Carlo methods were used to relate contamination activity levels to the measurable radiation levels at select distances away from an individual with whole-body contamination. (cdc.gov)
  • Dedicated cerebellar analysis was performed on a subset of 108 scans using a spatially unbiased infratentorial template. (bmj.com)
  • The positive emotional faces only evoked mild activations of crus 2 in the cerebellum, whereas the negative emotional faces evoked prominent activations in lobules VI and VIIa in its hemispheres and lobules VIII and IX in the vermis. (springer.com)
  • In 12 patients with mild to moderate forms of Alzheimer's disease and 10 elderly control volunteers, activation of the MTL memory system was studied. (ajnr.org)
  • In the present study, we applied paradigms involving the visual encoding of complex color pictures and visual associations of line drawings to study the activation pattern in patients with mild to moderate forms of Alzheimer's disease and in healthy elderly control volunteers. (ajnr.org)
  • MRI has been used to assess brain functions more than 30 years ago, with the groundbreaking discovery of the blood‐oxygen‐level‐dependent ( BOLD ) contrast (Ogawa et al. (pocketdentistry.com)
  • The primary form of fMRI uses the blood-oxygen-level dependent (BOLD) contrast, discovered by Seiji Ogawa in 1990. (theinfolist.com)
  • In this functional magnetic resonance imaging (fMRI) study, we investigate the effects of the anxiolytic GABA A (gamma-Aminobutyric acid) modulator, lorazepam, on behavioral and neural levels in response to coercive power. (researchsquare.com)
  • Evidence obtained with low-resolution and low-field functional imaging techniques (PET, 1.5T MRI scanner) also supports the possibility that the cerebellum contributes to the control of emotions, but in these studies, precise localization at the cerebellar sub-regional level remains to be established [ 16 , 18 - 20 ] (Table 1 ). (springer.com)
  • Neural signatures of human fear conditioning: an updated and extended meta-analysis of fMRI studies. (wikipedia.org)
  • While Milgram's and other studies reported widespread obedience to cause ordinary people to become callous and skewed towards dissembling obedience levels, they neglect the fact that agents under coercive pressure are also victims of coercive violence. (researchsquare.com)
  • The primary analyses detected no convergence across studies. (psychiatryonline.org)
  • Several recent studies have suggested that increased training intensity via high levels of task repetition is an important driver of motor recovery after stroke (8-10). (medicaljournals.se)
  • For each of these voxels, a general linear model (GLM) is used to model brain activation, at the first and the second level [ 3 ]. (hindawi.com)
  • However, developing hypotheses about viewing violence and brain activation needs to start with research on physiological arousal (e.g. (psychiatrictimes.com)
  • The resulting brain activation can be graphically represented by color-coding the strength of activation across the brain or the specific region studied. (theinfolist.com)
  • We applied functional MR imaging with a learning task in healthy elderly volunteers and in patients with Alzheimer's disease to study brain activation during memory performance. (ajnr.org)
  • Second, we wanted to compare brain activation of elderly volunteers and patients with Alzheimer's disease. (ajnr.org)
  • Our hypothesis was that in the MTL, brain activation would be decreased in patients compared with control volunteers. (ajnr.org)
  • Further, statistical power analysis has not been considered in the selection of the sample, potentially limiting the statistical power of the study (Cohen, 1992). (savedelicious.com)
  • However, this argument is undermined by the paucity of research demonstrating differential ToM performance at behavioural and neural levels across patient groups. (savedelicious.com)
  • Voxel-based morphometry revealed grey-matter and white-matter atrophy, even in subjects furthest from predicted disease onset. (medscape.com)
  • The findings suggest replicable neuroimaging features associated with major depression, beyond the transdiagnostic effects reported in previous meta-analyses, and support a continued research focus on the subgenual cingulate and other selected regions' role in depression. (psychiatryonline.org)
  • The present disclosure provides a method and a device for an activation of brain regions. (justia.com)
  • However, an effective method or a device for an activation of brain regions is still left to be invented. (justia.com)
  • One objective of the present disclosure is to provide an effective a method and a device for an activation of brain regions. (justia.com)
  • The tertiary analyses (clinical subtypes) showed improved convergence relative to the secondary analyses. (psychiatryonline.org)
  • Second-level analysis based on a mass univariate approach typically consists of 3 phases. (hindawi.com)
  • Therefore, activation of the right SFG was associated with more efficient response inhibition and less motor urgency. (jneurosci.org)
  • In secondary meta-analyses, the data were grouped across primary categories, and in tertiary analyses, by medication status and absence of psychiatric comorbidity. (psychiatryonline.org)
  • In order to measure the neural activation associated with memory formation, the subjects were shown word and picture stimuli that they'd never seen before. (discovermagazine.com)
  • With functional MR imaging, encoding of complex color pictures or visual associations of line drawings was shown to lead to activation in caudal portions of the parahippocampal gyrus and hippocampal formation (15-17) . (ajnr.org)
  • Instead, they suggest that a positive BOLD signal can also be caused by a local increase of blood volume, even if deoxyhemoglobin levels are persistently elevated. (jneurosci.org)
  • a positive BOLD signal could be caused not only by deoxyhemoglobin washout from a given voxel but also by an increase of the water fraction around the deoxyhemoglobin molecules in that voxel. (jneurosci.org)
  • They found that the MR signals will increase and decrease according to the level of oxygenated and deoxygenated haemoglobin, and this change is associated with a complex haemodynamic process, such as changes in CBF and cerebral blood volume (Huettel et al. (pocketdentistry.com)
  • Among patients who also underwent category or antonym word generation or both, the similarity of the activation from each task was assessed with the CR. (ajnr.org)
  • Furthermore, a meaningful comparison of fMRI and ORIS also requires analogous data analysis procedures. (jneurosci.org)
  • Here, we present a hybrid approach, selecting data-driven voxels in paradigm-driven measurements in order to identify functional connectivity motifs in the voxel correlations. (mssm.edu)
  • Recent developments of multivoxel pattern analysis (MVPA) for fMRI data allow for more fine-grained investigations into the functionality and properties of brain systems. (mit.edu)
  • An alternative approach uses independent localizer data for each subject to select the most responsive voxels and define individual ROIs within the boundaries of a group template. (mit.edu)
  • The remaining sample underwent comprehensive data analysis, focusing on brain responses during task segments and ketamine's influence on social cognition-related neural activity. (news-medical.net)
  • A threshold was chosen for each study, which provided 10-14 activated voxels within the selected sections. (ajnr.org)
  • In patients 3, 5, and 19, in whom no activation was identified at a threshold of P = .001, multiple thresholds were used without the identification of activation. (ajnr.org)
  • Specify that there is no identified threshold or safe level of lead in blood. (cdc.gov)
  • There is no identified threshold or safe level of lead in blood" [AAP 2016]. (cdc.gov)
  • QUESTIONS/PURPOSES: (1) Is there a difference in region and voxel (volume pixel) of cortical activation during plantarflexion and dorsiflexion between patients with chronic ankle instability and a control group with normal ankle function? (bvsalud.org)
  • In the first-level analysis, the evidence per subject is summarized in a linear contrast of the parameters, necessary to model the study design. (hindawi.com)
  • These contrast images are then passed to the second-level analysis in which the evidence is weighted over subjects. (hindawi.com)
  • Using high-resolution functional magnetic resonance imaging (fMRI) and multi-voxel pattern analysis (MVPA), we sought to determine the degree to which these complex motor processes are dissociable in basal ganglia and cortical networks. (frontiersin.org)
  • In particular, MVPA in the MD network was used to gain better understanding of control processes such as attentional effects, adaptive coding, and representation of multiple task-relevant features, but overall low decoding levels have limited its use for this network. (mit.edu)
  • This is taken to be compensatory activation/recruitment of additional resources to attain similar performance levels on the task, which may be reversible with prolonged abstinence. (ljmu.ac.uk)
  • Mahowald, K. & Fedorenko, E. Reliable individual-level neural markers of high-level language processing: a necessary precursor for relating neural variability to behavioral and genetic variability. (nature.com)