Showing papers in "NeuroImage in 1998"

TL;DR: This paper focuses on bilateral ventrolateral prefrontal responses that show deactivations for previously seen words and activations for novel words in functional magnetic resonance imaging that are evoked by different sorts of stimuli.

TL;DR: Correlations to left hemisphere motor cortex, visual cortex, and amygdala are measured in long resting-state scans and these correlations are extended to lower sampling rate multislice echoplanar acquisitions and other right/left hemisphere-symmetric functional cortices.

TL;DR: It is found that while there is significant and substantial variability in the shape of responses collected across subjects, responses collected during multiple scans within a single subject are less variable.

TL;DR: It is concluded that in some subjects, EEG/fMRI studies will be feasible only using PA subtraction, and particular attention has been given to reliable ECG peak detection and ensuring that the average PA waveform is free of other EEG artifacts.

TL;DR: The generalisability of inferences drawn from multi-subject functional neuroimaging experiments is concerned, and a hierarchical model an inter-subject level model on the parameters of the standard intra- subject level model presented above is presented.

TL;DR: In this paper, the authors exploited fMRI to measure changes in blood oxygen-level-dependent (BOLD) signal throughout the course of learning and found linear and nonlinear changes of BOLD signal over time were found in prefrontal, premotor, and parietal cortex and in neostriatal and cerebellar areas.

TL;DR: A framework that allows this technique to be implemented in the context of the general linear model employed by statistical parametric mapping (SPM) is presented, and the use of corrected P values for F fields is emphasized.

TL;DR: A method for characterizing the linear and nonlinear properties of the hemodynamic response of the BOLD response is introduced and it is shown that visual stimulation under 4 s in duration and less than 40% contrast yield strong nonlinear responses.

TL;DR: A large part of the somatosensory homunculus was reproduced quantitatively on an individual brain MRI using magnetoencephalography, which is compatible with the bizarre proportion of the Homunculus with a large tongue, lips, and fingers.

TL;DR: Right anterior prefrontal cortex, which has been implicated in episodic retrieval, was most active during successful retrieval after deep encoding, and right anterior insular regions and a left dorsal prefrontal region were more active after shallow encoding, when retrieval demanded greatest effort.

TL;DR: The hypothesis that distinct functional systems are involved in visuomotor imagination and generation of simple finger movements is supported: associative parietofrontal areas are primarily related to visuOMotor imagination, with inferior frontal cortex likely engaged in active motor suppression, and primary motor structures contribute mainly to movement execution.

TL;DR: Results are consistent with the hypothesis that perception of eyes regardless of the direction of the gaze is subserved by a distributed network, but no conclusive evidence was found for specific area(s) devoted to mutual gaze processing.

TL;DR: The stroboscopic event-related method appeared effective in minimizing effects of the interaction between scanning noise and experimental auditory stimulation; it adds useful temporal information to the spatial resolution afforded by fMRI in studies of human auditory function, while allowing presentation of auditory stimuli on a silent background.

TL;DR: It is concluded that a simplified reference tissue approach may be used to quantify 5-HT1A binding either in terms of ROI data or as parametric images.

TL;DR: A comparative evaluation of which regions are more peripheral or more central suggests distinct differences between the two groups of subjects as well as the applicability of this analysis to data obtained with imaging modalities offering higher temporal resolution than PET.

TL;DR: The data presented here provide additional support for the notion that "nonclassical" language areas in extrasylvian frontal and temporal regions mediate word retrieval and that the pattern of their engagement relates to conceptual category.

TL;DR: This double dissociation suggests that the frontal and cerebellar regions make distinctive contributions to cognitive performance, with left-frontal (and striatal) activations reflecting response selection, which increases in difficulty when there are many appropriate responses, and right-cerebellar activation reflecting the search for responses,Which increases in difficulties when even a single appropriate response is hard to retrieve.

TL;DR: The superior performance of MEG over EEG appears to be because the latter is more sensitive to errors in the forward model arising from simplifying assumptions concerning the conductivity of the skull, scalp and brain.

TL;DR: Findings in right anterior prefrontal cortex go against the retrieval success hypothesis as formally proposed and provide an important constraint for interpretation of this region's role in episodic retrieval.

TL;DR: A modification of the cluster analysis proposed by Roland et al. is presented, showing the method used to be specific and sensitive and is further compared with SPM96 and the nonparametric method of Holmes etAl.

TL;DR: The results of this experiment suggest that overall sentence processing occurs in regions of the left perisylvian association cortex and provide evidence that one particular aspect of sentence processing is centered in the pars opercularis of Broca's area.

TL;DR: In this paper, the authors used event-related functional magnetic resonance imaging (fMRI) to characterize neural responses associated with emotional learning and found that different responses of the amygdalae were best characterized by a time by stimulus interaction indicating a rapid adaptation of CS+-specific responses in this region.

TL;DR: A body of recent results indicates that there is no unique mental imagery cortical network; rather, it reflects the high degree of interaction between mental imagery and other cognitive functions.

TL;DR: Differences elsewhere in the brain suggest that different strategies or cognitive processes are used by the elderly to maintain memory representations over short periods of time.

TL;DR: Changes in activity in regions distant from the patients' structural damage support the argument that their prominent anomia is due to disrupted temporal lobe connections.

TL;DR: Functional neuroimaging with the activation paradigm provides insight into the understanding of the functional neuroanatomy of episodic memory over and above established knowledge from lesional neuropsychology, as well as the neural mechanisms underlying the age-related changes in episodi memory performances.

TL;DR: Results from PET and fMRI studies suggest that global neuroimaging signals can be correlated with the experimental manipulation and are thus not necessarily simple nuisance variables.

TL;DR: This multisite study, the first of its kind using fMRI data, demonstrates highly consistent findings across sites, showing reliable patterns of activation in dorsolateral prefrontal cortex and posterior parietal cortex during performance of the working memory task across all four sites.

TL;DR: The current study uses two very different tasks known to activate the cingulate and compares data from the same subjects and same trials to see whether there are temporal and spatial distinctions in cingulates activations.

TL;DR: In this paper, a vibratory stimulus was applied to an individual digit tip (digit 1, 2, or 5) on the right hand to investigate the organization of the human primary somatosensory cortex, cortical regions located on the upper bank of the Sylvian fissure (SII region), insula, and posterior parietal cortex.