Justin Chumbley

Justin Chumbley, PhD

Statistician PhD

Raumbezeichnung: AND 4.10

justin.chumbley@jacobscenter.uzh.ch

Justin Chumbley received his Ph.D. from University College, London. He is an applied statistician with an inter-disciplinary background in behavioral and biological sciences (economics postdoc, psychology undergraduate, neuroscience Masters). He has developed novel frequentist/Bayesian statistical tools for large datasets with which to better identify statistically and causally significant patterns in high dimensional - e.g. spatio-temporal - settings. His probabilistic models of - and experiments on - choice behavior and learning have drawn on economics, psychology, game theory, reinforcement/unsupervised learning theory and biology. Now at the Jacobs Center, he consults on the design and analysis of behavioural and gene-expression data collected in the context of panel studies.

Example publications

Statistical methods

K.H. Brodersen, C. Mathys, J.R. Chumbley, J. Daunizeau, C.S. Ong, J.M. Buhmann, and K.E. Stephan. Bayesian mixed-effects inference on classification performance in hierarchical datasets. Journal of Machine Learning Research, 2012. pubmed.

J.R. Chumbley, G. Flandin, ML Seghier, and KJ Friston. Multinomial inference on distributed responses in spm. NeuroImage, 53(1):161–170, 2010. pubmed.

J.R. Chumbley, K. Worsley, G. Flandin, and K. Friston. Topological fdr for neuroimaging. NeuroImage, 49(4):3057–3064, 2010. pubmed.

J.R. Chumbley and K.J. Friston. False discovery rate revisited: Fdr and topological inference using gaussian random fields. Neu- roImage, 44(1):62–70, 2009. pubmed.

J.R. Chumbley, K.J. Friston, T. Fearn, and S.J. Kiebel. A metropolis-hastings algorithm for dynamic causal models. NeuroImage, 38(3):478–487, 2007. pubmed.

Behavior and biology

J.R. Chumbley, J. Späti, N. Dörig, J. Brakowski, M. G. Holt- forth, E. Seifritz, and S. Spinelli. Bdnf val66met polymorphism influence on striatal blood-level-dependent response to mone- tary feedback depends on valence and agency. Neuroscience, 280:130–141, 2014. pubmed.

J.R. Chumbley, C.J. Burke, K.E. Stephan, K.J. Friston, P.N. Tobler, and E Fehr. Surprise beyond prediction error. Human brain mapping, 2014. pubmed.

J.R. Chumbley and E. Fehr. Does general motivation energize financial reward seeking: Evidence from an effort task. Plos One, 2014. pubmed.

J.R. Chumbley, O. Hulme, H. Koechli, E. Russell, S. Van Uum, D. Pizzagalli, and E. Fehr. Stress and reward: long term cortisol exposure predicts the strength of sexual preference. Physiology & Behavior, 2014. pubmed.

J.R. Chumbley, I. Krajbich, J. Engelmann, E. Russell, S. Van Uum, G. Koren, and E. Fehr. Endogenous cortisol predicts lower loss aversion in young men. Psychological science, 2014. pubmed.

M.N. Hartmann, J.R. Chumbley, and et. al. Apathy but not diminished expression in schizophrenia is associated with discounting of monetary rewards by physical effort. Schizophrenia Bulletin, 2014. pubmed.

J. Spati, J.R. Chumbley, J. Brakowski, N. Dorig, MG. Holtforth, E. Seifritz, and S. Spinelli. Functional lateralization of the anterior insula during feedback processing. Human brain mapping, 2014. pubmed.

K.H. Brodersen, J. Daunizeau, C. Mathys, J.R. Chumbley, J.M. Buhmann, and K.E. Stephan. Variational bayesian mixed-effects inference for classification studies. NeuroImage, 2013. pubmed.

J.R. Chumbley, PN Tobler, and E Fehr. Fatal attraction: Ventral striatum predicts costly choice errors in humans. NeuroImaage, 2013. pubmed.

J.R. Chumbley, G. Flandin, D.R. Bach, J. Daunizeau, E. Fehr, RJ Dolan, and KJ Friston. Learning and generalization under ambiguity: An fmri study. PLoS Computational Biology, 8(1), 2012. pubmed.

J.R. Chumbley, R.J. Dolan, and K.J. Friston. Attractor models of working memory and their modulation by reward. Biological Cybernetics, 98(1):11–18, 2008. pubmed.

J.R. Chumbley and M. Griffiths. Affect and the computer game player: The effect of gender, personality, and game reinforce- ment structure on affective responses to computer game-play. CyberPsychology & Behavior, 9(3):308–316, 2006. pubmed.

L.E. Kennard, J.R. Chumbley, K.M. Ranatunga, S.J. Armstrong, E.L. Veale, and A. Mathie. Inhibition of the human two pore domain potassium channel, trek 1, by fluoxetine and its metabolite norfluoxetine. British Journal of Pharmacology, 144(6):821–829, 2005. pubmed.

J.R. Chumbley, K.M. Ranatunga, and A Mathie. Inhibition of human two-pore domain k+ channel trek-1 (htrek-1) by fluoxetine. Proceedings of the British Pharmacological Society, page 116, 2003.