Research Topics
| V CalhounSummaryAffiliation: Johns Hopkins University Country: USA Publications
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Detail Information
Publications
A weighted least-squares algorithm for estimation and visualization of relative latencies in event-related functional MRIV Calhoun
Division of Psychiatric Neuro Imaging, Johns Hopkins University, Baltimore, Maryland 21205, USA
Magn Reson Med 44:947-54. 2000..The WLS method was developed to study the properties of hemodynamic latencies, which may be increasingly important as event-related fMRI continues to be advanced...- Spatial and temporal independent component analysis of functional MRI data containing a pair of task-related waveformsV D Calhoun
Division of Psychiatric Neuro Imaging, Johns Hopkins University, Baltimore, Maryland, USA
Hum Brain Mapp 13:43-53. 2001.... - A method for making group inferences from functional MRI data using independent component analysisV D Calhoun
Division of Psychiatric Neuro Imaging, Johns Hopkins University, Baltimore, Maryland, USA
Hum Brain Mapp 14:140-51. 2001.... - 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... 
Modulation of temporally coherent brain networks estimated using ICA at rest and during cognitive tasksVince D Calhoun
Olin Neuropsychiatry Research Center, Institute of Living, Hartford, Connecticut 06106, USA
Hum Brain Mapp 29:828-38. 2008..In summary, TCNs show considerable promise as potential imaging biological markers of brain diseases, though each network needs to be studied in more detail...- An adaptive reflexive processing model of neurocognitive function: supporting evidence from a large scale (n = 100) fMRI study of an auditory oddball taskKent A Kiehl
Olin Neuropsychiatry Research Center, The Institute of Living, Hartford, CT 06106, USA
Neuroimage 25:899-915. 2005..This process may be termed 'adaptive reflexive processing.' The implications of these results for interpreting functional MRI studies are discussed... - Alcohol intoxication effects on visual perception: an fMRI studyVince D Calhoun
Olin Neuropsychiatry Research Center, Institute of Living, Hartford, Connecticut 06106, USA
Hum Brain Mapp 21:15-26. 2004..e., increased in spatial extent) at the higher dose. Alcohol, thus, appears to have both global and local effects upon the neural correlates of the MVPT-R task, some of which are dose dependent... - Estimating the number of independent components for functional magnetic resonance imaging dataYi Ou Li
Department of Computer Science and Electrical Engineering, University of Maryland, Baltimore County, Baltimore, Maryland 21250, USA
Hum Brain Mapp 28:1251-66. 2007.... - Aberrant "default mode" functional connectivity in schizophreniaAbigail G Garrity
Trinity College, Hartford, CT, USA
Am J Psychiatry 164:450-7. 2007..It was hypothesized that the default mode network would show abnormal activation and connectivity in patients with schizophrenia... - Functional neural networks underlying response inhibition in adolescents and adultsMichael C Stevens
Olin Neuropsychiatry Research Center, Hartford, CT 06106, United
Behav Brain Res 181:12-22. 2007..We identify and characterize several age-related differences in the function of neural circuits that are associated with behavioral performance changes across adolescent development... - Performance of blind source separation algorithms for fMRI analysis using a group ICA methodNicolle Correa
Department of Computer Science and Electrical Engineering, University of Maryland, Baltimore County, Baltimore, MD 21250, USA
Magn Reson Imaging 25:684-94. 2007..Our results greatly improve our confidence in the consistency of ICA for fMRI data analysis... - Unmixing concurrent EEG-fMRI with parallel independent component analysisTom Eichele
Department of Biological and Medical Psychology, University of Bergen, Jonas Lies vei 91, 5011 Bergen, Norway
Int J Psychophysiol 67:222-34. 2008..We illustrate the utility of this method by extracting a previously undetected but relevant EEG-fMRI component from a concurrent auditory target detection experiment... - Joint independent component analysis for simultaneous EEG-fMRI: principle and simulationMatthias Moosmann
Department of Biological and Medical Psychology, University of Bergen, Jonas Lies vei 91, 5011 Bergen, Norway
Int J Psychophysiol 67:212-21. 2008..Our results indicate that this approach is a feasible and physiologically plausible data-driven way to achieve spatiotemporal mapping of event related responses in the human brain... - Selective changes of resting-state networks in individuals at risk for Alzheimer's diseaseChristian Sorg
Department of Psychiatry, Klinikum rechts der Isar, Technische Universitat Munchen, Ismaningerstrasse 22, 81675 Munich, Germany
Proc Natl Acad Sci U S A 104:18760-5. 2007..We interpret our finding as a proof of principle, demonstrating that functional brain disorders can be characterized by functional-disconnectivity profiles of RSNs... - A method for functional network connectivity among spatially independent resting-state components in schizophreniaMadiha J Jafri
Olin Neuropsychiatry Research Center, Institute of Living, Hartford, CT 06106, USA
Neuroimage 39:1666-81. 2008..Significant differences between patient and control connectivity in different networks were revealed possibly reflecting deficiencies in cortical processing in patients... - A large scale (N=400) investigation of gray matter differences in schizophrenia using optimized voxel-based morphometryShashwath A Meda
Olin Neuropsychiatry Research Center, Institute of Living at Hartford Hospital, Hartford, CT 06106, USA
Schizophr Res 101:95-105. 2008..However, results from these studies vary widely, likely due to different methodological or statistical approaches... - Prediction of human errors by maladaptive changes in event-related brain networksTom Eichele
Department of Biological and Medical Psychology, University of Bergen, 5009 Bergen, Norway
Proc Natl Acad Sci U S A 105:6173-8. 2008..Our findings provide insights into the brain network dynamics preceding human performance errors and suggest that monitoring of the identified precursor states may help in avoiding human errors in critical real-world situations... - Alterations in memory networks in mild cognitive impairment and Alzheimer's disease: an independent component analysisKim A Celone
Memory Disorders Unit, Department of Neurology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
J Neurosci 26:10222-31. 2006..These data may also provide functional evidence of the interaction between neocortical and medial temporal lobe pathology in early AD... - Functional neural circuits for mental timekeepingMichael C Stevens
Olin Neuropsychiatry Research Center, Hartford, Connecticut 06106, USA
Hum Brain Mapp 28:394-408. 2007..These findings are discussed within the context of current biological and information processing models of neural timekeeping... - Aberrant localization of synchronous hemodynamic activity in auditory cortex reliably characterizes schizophreniaVince D Calhoun
Institute of Living, Olin Neuropsychiatry Research Center, 200 Retreat Avenue, Hartford, CT 06106, USA
Biol Psychiatry 55:842-9. 2004.... - Functional MRI study of a serial reaction time task in Huntington's diseaseJin Suh Kim
Olin Neuropsychiatry Research Center, Institute of Living, Hartford Hospital, 400 Washington St, Hartford, CT 06106, USA
Psychiatry Res 131:23-30. 2004..The variable striatal activity in the Huntington's group suggests early functional loss possibly associated with previously demonstrated early atrophy of these same neural structures... - 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... - Lack of sex effect on brain activity during a visuomotor response task: functional MR imaging studyNina Mikhelashvili-Browner
Johns Hopkins Hospital, The Russell H. Morgan Department of Radiology and Radiological Sciences, Division of Neuroradiology, Baltimore, MD 21205, USA
AJNR Am J Neuroradiol 24:488-94. 2003..The need to control for sex effects is not critical in the analysis of this task with fMRI... - Source density-driven independent component analysis approach for fMRI dataBaoming Hong
Olin Neuropsychiatry Research Center, Institute of Living, Hartford, Connecticut 06106, USA
Hum Brain Mapp 25:297-307. 2005..Our experimental results show that the source density-driven ICA method can improve performance further by incorporating some a priori information into ICA analysis of fMRI signals... - Effect of age on visuomotor functional MR imagingAylin Tekes
Johns Hopkins Hospital, The Russell H. Morgan Department of Radiology and Radiological Sciences, Division of Neuroradiology, 600 N. Wolfe Street/ Phipps B-112, Baltimore, MD 21287, USA
Acad Radiol 12:739-45. 2005..05), with the exception of old and young age groups in RO region (P = 0.11). CONCLUSION: The group analysis, and unpaired t test results reveal higher amplitude of fMRI activation in the young versus the old and middle-aged groups... - Abnormal object recall and anterior cingulate overactivation correlate with formal thought disorder in schizophreniaMichal Assaf
Olin Neuropsychiatry Research Center, Institute of Living, Hartford, CT 06106, USA
Biol Psychiatry 59:452-9. 2006..An influential theory is that FTD results from impaired semantic memory processing. We explored the neural correlates of semantic memory retrieval in schizophrenia using an imaging task assessing semantic object recall... - 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... - Correlation of reaction time in and out of the functional MR unitNina Mikhelashvili-Browner
Acad Radiol 9:513-9. 2002..The effect of anticipation should be minimized, which could best be achieved by using event-related paradigms... - Unmixing fMRI with independent component analysisVince D Calhoun
Medical Image Analysis Lab, Olin Neuropsychiatry Research Center, Hartford, CT 06106, USA
IEEE Eng Med Biol Mag 25:79-90. 2006 - Simulated driving and brain imaging: combining behavior, brain activity, and virtual realityKara N Carvalho
Trinity University, Hartford, CT 06106, USA
CNS Spectr 11:52-62. 2006..Additional components and significant findings are further outlined. CONCLUSION: In summary, continuous behavioral variables conjoined with ICA may offer new insight into the neural correlates of complex human behavior...