User profiles for K. J. Friston

Karl Friston

University College London
Verified email at ucl.ac.uk
Cited by 343477

Functional and effective connectivity: a review

KJ Friston - Brain connectivity, 2011 - liebertpub.com
… from its original formulation in Friston et al. (1993) and an early synthesis in Friston (1995). …
David OCosmelli DFriston KJ2004Evaluation of different measures of functional connectivity …

Free-energy and the brain

KJ Friston, KE Stephan - Synthese, 2007 - Springer
If one formulates Helmholtz’s ideas about perception in terms of modern-day theories one
arrives at a model of perceptual inference and learning that can explain a remarkable range of …

Statistical parametric maps in functional imaging: a general linear approach

KJ Friston, AP Holmes, KJ Worsley… - Human brain …, 1994 - Wiley Online Library
… may reflect symptom severity [Friston et al., … [Friston et al., 1992bl. Another example of an
interaction is between cognitive activation and the effects of a centrally acting drug [Friston et al.…

Models of brain function in neuroimaging

KJ Friston - Annu. Rev. Psychol., 2005 - annualreviews.org
Inferences about brain function, using neuroimaging data, rest on models of how the data
were caused. These models can be quite diverse, ranging from conceptual models of …

Classical and Bayesian inference in neuroimaging: theory

KJ Friston, W Penny, C Phillips, S Kiebel, G Hinton… - NeuroImage, 2002 - Elsevier
This paper reviews hierarchical observation models, used in functional neuroimaging, in a
Bayesian light. It emphasizes the common ground shared by classical and Bayesian methods …

[HTML][HTML] Attention, uncertainty, and free-energy

H Feldman, KJ Friston - Frontiers in human neuroscience, 2010 - frontiersin.org
We suggested recently that attention can be understood as inferring the level of uncertainty
or precision during hierarchical perception. In this paper, we try to substantiate this claim …

Action and behavior: a free-energy formulation

KJ Friston, J Daunizeau, J Kilner, SJ Kiebel - Biological cybernetics, 2010 - Springer
We have previously tried to explain perceptual inference and learning under a free-energy
principle that pursues Helmholtz’s agenda to understand the brain in terms of energy …

[BOOK][B] Statistical parametric mapping: the analysis of functional brain images

WD Penny, KJ Friston, JT Ashburner, SJ Kiebel… - 2011 - books.google.com
In an age where the amount of data collected from brain imaging is increasing constantly, it
is of critical importance to analyse those data within an accepted framework to ensure proper …

Dynamic causal modelling

KJ Friston, L Harrison, W Penny - Neuroimage, 2003 - Elsevier
In this paper we present an approach to the identification of nonlinear input–state–output
systems. By using a bilinear approximation to the dynamics of interactions among states, the …

Functional and effective connectivity in neuroimaging: a synthesis

KJ Friston - Human brain mapping, 1994 - Wiley Online Library
… This data is the same as that used in Friston et al. [1993a]. To facilitate intersubject pooling,
… Whole brain differences were removed using ANCOVA [Friston et al., 19901 and the …