Research Topics | James J PekarSummaryAffiliation: Johns Hopkins University Country: USA Publications
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Publications
A brief introduction to functional MRIJames J Pekar
Johns Hopkins University School of Medicine, USA
IEEE Eng Med Biol Mag 25:24-6. 2006- Different activation dynamics in multiple neural systems during simulated drivingVince D Calhoun
Division of Psychiatric Neuro Imaging, Department of Psychiatry, Johns Hopkins University, Baltimore, Maryland 21205, USA
Hum Brain Mapp 16:158-67. 2002..Increases in cerebellar and occipital areas, presumably related to complex visuomotor integration, are activated during driving but not associated with driving speed... - On the relationship between seed-based and ICA-based measures of functional connectivitySuresh E Joel
Russell H Morgan Department of Radiology and Radiological Science, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
Magn Reson Med 66:644-57. 2011..We present a simple simulation and an experiment on visuomotor activity that highlight this relationship between the two methods... - Physiological origin for the BOLD poststimulus undershoot in human brain: vascular compliance versus oxygen metabolismJun Hua
Russell H Morgan Department of Radiology and Radiological Science, Division of MR Research, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA
J Cereb Blood Flow Metab 31:1599-611. 2011..Using a biophysical model, their relative contributions were estimated to be 19.7±15.9% and 78.7±18.6%, respectively... - Transient neural activity in human parietal cortex during spatial attention shiftsSteven Yantis
Department of Psychological and Brain Sciences, Johns Hopkins University, Baltimore, Maryland 21218, USA
Nat Neurosci 5:995-1002. 2002..This result suggests that activation of the parietal cortex is associated with a discrete signal to shift spatial attention, and is not the source of a signal to continuously maintain the current attentive state... - Functional magnetic resonance imaging based on changes in vascular space occupancyHanzhang Lu
Department of Radiology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA
Magn Reson Med 50:263-74. 2003..Arguments supporting a better gray matter localization for the VASO-fMRI approach compared to BOLD are provided... - Effect of inflow of fresh blood on vascular-space-occupancy (VASO) contrastManus J Donahue
Russell H Morgan Department of Radiology and Radiological Science, Division of MR Research, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA
Magn Reson Med 61:473-80. 2009..4% +/- 0.2%) than short-TR data (DeltaS/S = -2.2% +/- 0.2%), implying that cerebral blood flow or transit-state effects may influence VASO contrast at short TR... - Tract probability maps in stereotaxic spaces: analyses of white matter anatomy and tract-specific quantificationKegang Hua
Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
Neuroimage 39:336-47. 2008..Excellent correlation was found between the automated and the individual tractography-based results. This tool allows efficient initial screening of the status of multiple white matter tracts... - Differential brain activation in anorexia nervosa to Fat and Thin words during a Stroop taskGraham W Redgrave
Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
Neuroreport 19:1181-5. 2008..Mechanisms underlying attentional bias in anorexia nervosa likely differ under conditions of positive and negative valence. This paradigm is a promising tool to examine neural mediation of emotional response in anorexia nervosa... - Functional brain changes in presymptomatic Huntington's diseaseSarah A J Reading
Department of Psychiatry, Johns Hopkins University, Baltimore, MD 21287, USA
Ann Neurol 55:879-83. 2004..In the setting of normal cognitive performance, presymptomatic HD subjects had significantly and specifically less activation in the left anterior cingulate cortex (BA 24, 32) compared with matched controls... - Functional brain correlates of response time variability in childrenDaniel J Simmonds
Kennedy Krieger Institute, Baltimore, MD 21205, USA
Neuropsychologia 45:2147-57. 2007.... - Theoretical and experimental investigation of the VASO contrast mechanismManus J Donahue
Russell H. Morgan Department of Radiology and Radiological Sciences, Division of MR Research, Johns Hopkins University, Baltimore, Maryland 21205, USA
Magn Reson Med 56:1261-73. 2006..Thus, many competing effects contribute to VASO contrast and care should be taken during interpretation... - Meta-analysis of Go/No-go tasks demonstrating that fMRI activation associated with response inhibition is task-dependentDaniel J Simmonds
Kennedy Krieger Institute, 707 North Broadway, Baltimore, MD 21205, USA
Neuropsychologia 46:224-32. 2008.... - fMRI evidence that the neural basis of response inhibition is task-dependentStewart H Mostofsky
Developmental Cognitive Neurology, Kennedy Krieger Institute, 707 North Broadway, Baltimore, MD 21205, USA
Brain Res Cogn Brain Res 17:419-30. 2003.... - Functional magnetic resonance imaging evidence for abnormalities in response selection in attention deficit hyperactivity disorder: differences in activation associated with response inhibition but not habitual motor responseStacy J Suskauer
Kennedy Krieger Institute, 707 North Broadway, Baltimore, MD 21205, USA
J Cogn Neurosci 20:478-93. 2008.... - A method for multitask fMRI data fusion applied to schizophreniaVince D Calhoun
Olin Neuropsychiatry Research Center, Institute of Living, Hartford, Connecticut 06106, USA
Hum Brain Mapp 27:598-610. 2006..It thus provides a way to integrate and probe brain networks using a variety of tasks and may increase our understanding of coordinated brain networks and the impact of pathology upon them... - Atypical motor and sensory cortex activation in attention-deficit/hyperactivity disorder: a functional magnetic resonance imaging study of simple sequential finger tappingStewart H Mostofsky
Kennedy Krieger Institute, Baltimore, MD 21205, USA
Biol Psychiatry 59:48-56. 2006..Functional magnetic resonance imaging (fMRI) was used to determine whether differences in brain activation during sequential finger tapping are present in children with ADHD compared with typically developing control subjects... - Alcohol intoxication effects on simulated driving: exploring alcohol-dose effects on brain activation using functional MRIVince D Calhoun
Olin Neuropsychiatry Research Center, Institute of Living, Hartford, CT, USA
Neuropsychopharmacology 29:2097-17. 2004..The fMRI data also suggest that the deficits observed in alcohol intoxication may be modulated primarily through OF/anterior cingulate, motor and cerebellar regions as opposed to attentional areas in frontoparietal cortex... - An account of the discrepancy between MRI and PET cerebral blood flow measures. A high-field MRI investigationManus J Donahue
The Russell H. Morgan Department of Radiology and Radiological Science, Division of MR Research, Johns Hopkins University, Baltimore, MD, USA
NMR Biomed 19:1043-54. 2006..The recent availability of MRI field strengths of 3.0 T and higher will facilitate the use of MRI-based CBF measurements in the clinic...