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, 2010
"... 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 using neuronal simulations of directed spatial attention and biased competition. These simulations assume that ne ..."
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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 using neuronal simulations of directed spatial attention and biased competition. These simulations assume that neuronal activity encodes a probabilistic representation of the world that optimizes free-energy in a Bayesian fashion. Because free-energy bounds surprise or the (negative) log-evidence for internal models of the world, this optimization can be regarded as evidence accumulation or (generalized) predictive coding. Crucially, both predictions about the state of the world generating sensory data and the precision of those data have to be optimized. Here, we show that if the precision depends on the states, one can explain many aspects of attention. We illustrate this in the context of the Posner paradigm, using the simulations to generate both psychophysical and electrophysiological responses. These simulated responses are consistent with attentional bias or gating, competition for attentional resources, attentional capture and associated speed-accuracy trade-offs. Furthermore, if we present both attended and nonattended stimuli simultaneously, biased competition for neuronal representation emerges as a principled and straightforward property of Bayes-optimal perception.
d D.W. Carmichael, c
, 2008
"... Recent advances in recording electrophysiological data simultaneously with magnetic resonance imaging H. Laufs, a,b,c,⁎ J. Daunizeau, ..."
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Recent advances in recording electrophysiological data simultaneously with magnetic resonance imaging H. Laufs, a,b,c,⁎ J. Daunizeau,
NeuroImage 42 (2008) 649–662 Contents lists available at ScienceDirect
"... journal homepage: www.elsevier.com/locate/ynimg ..."
NeuroImage 45 (2009) 453–462 Contents lists available at ScienceDirect
"... journal homepage: www.elsevier.com/locate/ynimg Forward and backward connections in the brain: A DCM study of functional asymmetries ..."
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journal homepage: www.elsevier.com/locate/ynimg Forward and backward connections in the brain: A DCM study of functional asymmetries
NeuroImage 44 (2009) 796–811 Contents lists available at ScienceDirect
"... journal homepage: www.elsevier.com/locate/ynimg ..."
NeuroImage 47 (2009) 1628–1638 Contents lists available at ScienceDirect
"... journal homepage: www.elsevier.com/locate/ynimg ..."
NeuroImage 46 (2009) 1004–1017 Contents lists available at ScienceDirect
"... journal homepage: www.elsevier.com/locate/ynimg ..."
YNIMG-08055; No. of pages: 16; 4C: NeuroImage xxx (2011) xxx–xxx Contents lists available at ScienceDirect
"... journal homepage: www.elsevier.com/locate/ynimg ..."
