J
John A. D. Aston
Researcher at University of Cambridge
Publications - 181
Citations - 4734
John A. D. Aston is an academic researcher from University of Cambridge. The author has contributed to research in topics: Covariance & Wavelet. The author has an hindex of 32, co-authored 168 publications receiving 4262 citations. Previous affiliations of John A. D. Aston include United States Census Bureau & Hammersmith Hospital.
Papers
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Journal ArticleDOI
A general statistical analysis for fMRI data.
Keith J. Worsley,C. H. Liao,John A. D. Aston,John A. D. Aston,John A. D. Aston,Valentina Petre,Gary H. Duncan,F. Morales,Alan C. Evans +8 more
TL;DR: A simple bias reduction and regularization for voxel-wise autoregressive model parameters and overcoming the problem of a small number of runs/session/subjects using a regularized variance ratio to increase the degrees of freedom are proposed.
Journal ArticleDOI
Positron emission tomography compartmental models: a basis pursuit strategy for kinetic modeling.
Roger N. Gunn,Steve R. Gunn,Federico Turkheimer,John A. D. Aston,John A. D. Aston,Vincent J. Cunningham +5 more
TL;DR: Although the method is presented in the context of PET neuroreceptor binding studies, it has general applicability to the quantification of PET/SPECT radiotracer studies in neurology, oncology, and cardiology.
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Positron emission tomography partial volume correction: estimation and algorithms.
John A. D. Aston,John A. D. Aston,Vincent J. Cunningham,M.-C. Asselin,M.-C. Asselin,Alexander Hammers,Alan C. Evans,Roger N. Gunn +7 more
TL;DR: In this paper, a mathematical framework has been developed to accommodate both tissue fraction and spillover effects in positron emission tomography (PET) data and to facilitate the development of new PVC algorithms based on the description of the problem.
Journal ArticleDOI
Dynamic functional changes associated with cognitive skill learning of an adapted version of the Tower of London task.
Miriam H. Beauchamp,Alain Dagher,John A. D. Aston,John A. D. Aston,Julien Doyon,Julien Doyon +5 more
TL;DR: Improved performance on the TOL task was associated with a significant decrease of activity in the medial orbitofrontal and frontopolar cortices over the course of learning, areas thought to be involved in decision making, guessing, and monitoring of feedback information.
Journal ArticleDOI
Estimating the delay of the fMRI response.
C. H. Liao,Keith J. Worsley,Keith J. Worsley,Jean-Baptiste Poline,John A. D. Aston,John A. D. Aston,Gary H. Duncan,Alan C. Evans +7 more
TL;DR: This work proposes a fast, efficient, general, simple, valid, and robust method of estimating and making inference about the delay of the fMRI response modeled as a temporal shift of the hemodynamic response function (HRF).