User profiles for Timothy P. L. Roberts

Timothy Roberts

Professor of Radiology, University of Pennsylvania
Verified email at email.chop.edu
Cited by 24415

GABA estimation in the brains of children on the autism spectrum: measurement precision and regional cortical variation

…, DJ Wang, RG Port, L Blaskey, SE Levy, TPL Roberts - Neuroimage, 2014 - Elsevier
H magnetic resonance spectroscopy ( 1 H MRS) and spectral editing methods, such as
MEGA-PRESS, allow researchers to investigate metabolite and neurotransmitter concentrations …

Latency of the auditory evoked neuromagnetic field components: stimulus dependence and insights toward perception

TPL Roberts, P Ferrari, SM Stufflebeam… - Journal of clinical …, 2000 - journals.lww.com
This review will focus on investigations of the auditory evoked neuromagnetic field component,
the M100, detectable in the magnetoencephalogram recorded during presentation of …

Diffusion weighted magnetic resonance imaging in stroke

TPL Roberts, HA Rowley - European journal of radiology, 2003 - Elsevier
Diffusion weighted magnetic resonance imaging has evolved from an esoteric laboratory
experiment to a critical aspect of routine clinical care of the patient presenting with symptoms …

Quantitative measurement of microvascular permeability in human brain tumors achieved using dynamic contrast-enhanced MR imaging: correlation with histologic …

HC Roberts, TPL Roberts… - American Journal of …, 2000 - Am Soc Neuroradiology
BACKGROUND AND PURPOSE: Dynamic contrast-enhanced MR imaging may be used to
quantify tissue fractional blood volume (fBV) and microvascular permeability. We tested this …

Validating γ oscillations and delayed auditory responses as translational biomarkers of autism

…, JC Edgar, RS Ehrlichman, M Mehta, TPL Roberts… - Biological …, 2010 - Elsevier
BACKGROUND: Difficulty modeling complex behavioral phenotypes in rodents (eg, language)
has hindered pathophysiological investigation and treatment development for autism …

MEG detection of delayed auditory evoked responses in autism spectrum disorders: towards an imaging biomarker for autism

TPL Roberts, SY Khan, M Rey, JF Monroe… - Autism …, 2010 - Wiley Online Library
Motivated by auditory and speech deficits in autism spectrum disorders (ASD), the
frequency dependence of superior temporal gyrus (STG) 50 msec (M50) and 100 msec (M100) …

Relating MEG measured motor cortical oscillations to resting γ-aminobutyric acid (GABA) concentration

W Gaetz, JC Edgar, DJ Wang, TPL Roberts - Neuroimage, 2011 - Elsevier
The human motor cortex exhibits characteristic beta (15–30Hz) and gamma oscillations (60–90Hz),
typically observed in the context of transient finger movement tasks. The functional …

[HTML][HTML] White matter changes of neurite density and fiber orientation dispersion during human brain maturation

…, P Bukshpun, MLJ Wakahiro, JI Berman, TPL Roberts… - PloS one, 2015 - journals.plos.org
Diffusion tensor imaging (DTI) studies of human brain development have consistently
shown widespread, but nonlinear increases in white matter anisotropy through childhood, …

The ultraluminous state revisited: fractional variability and spectral shape as diagnostics of super-Eddington accretion

AD Sutton, TP Roberts… - Monthly Notices of the …, 2013 - academic.oup.com
Although we are nearing a consensus that most ultraluminous X-ray sources (ULXs) below
10 41 erg s −1 represent stellar mass black holes accreting in a super-Eddington ‘…

Resting-state oscillatory activity in autism spectrum disorders

L Cornew, TPL Roberts, L Blaskey… - Journal of autism and …, 2012 - Springer
Neural oscillatory anomalies in autism spectrum disorders (ASD) suggest an excitatory/inhibitory
imbalance; however, the nature and clinical relevance of these anomalies are unclear. …