Awareness as inference in a higher-order state space

Abstract Humans have the ability to report the contents of their subjective experience—we can say to each other, ‘I am aware of X’. The decision processes that support these reports about mental contents remain poorly understood. In this article, I propose a computational framework that characterizes awareness reports as metacognitive decisions (inference) about a generative model of perceptual content. This account is motivated from the perspective of how flexible hierarchical state spaces are built during learning and decision-making. Internal states supporting awareness reports, unlike those covarying with perceptual contents, are simple and abstract, varying along a 1D continuum from absent to present. A critical feature of this architecture is that it is both higher-order and asymmetric: a vast number of perceptual states is nested under ‘present’, but a much smaller number of possible states nested under ‘absent’. Via simulations, I show that this asymmetry provides a natural account of observations of ‘global ignition’ in brain imaging studies of awareness reports.

[1]  Andreas Nieder,et al.  Active encoding of decisions about stimulus absence in primate prefrontal cortex neurons , 2012, Proceedings of the National Academy of Sciences.

[2]  T. Metzinger How does the brain encode epistemic reliability? Perceptual presence, phenomenal transparency, and counterfactual richness , 2014, Cognitive neuroscience.

[3]  C. Frith,et al.  The neural correlates of conscious experience: an experimental framework , 1999, Trends in Cognitive Sciences.

[4]  S. Dehaene,et al.  Causal role of prefrontal cortex in the threshold for access to consciousness. , 2009, Brain : a journal of neurology.

[5]  Randolph Blake,et al.  Psychophysical magic: rendering the visible ‘invisible’ , 2005, Trends in Cognitive Sciences.

[6]  Axel Cleeremans The Radical Plasticity Thesis: How the Brain Learns to be Conscious , 2011, Front. Psychology.

[7]  S Dehaene,et al.  A model of subjective report and objective discrimination as categorical decisions in a vast representational space , 2014, Philosophical Transactions of the Royal Society B: Biological Sciences.

[8]  Karl J. Friston,et al.  ‘Seeing the Dark’: Grounding Phenomenal Transparency and Opacity in Precision Estimation for Active Inference , 2018, Front. Psychol..

[9]  Karl J. Friston,et al.  A theory of cortical responses , 2005, Philosophical Transactions of the Royal Society B: Biological Sciences.

[10]  Gustavo Deco,et al.  Neuronal Discharges and Gamma Oscillations Explicitly Reflect Visual Consciousness in the Lateral Prefrontal Cortex , 2012, Neuron.

[11]  N. Block On a confusion about a function of consciousness , 1995, Behavioral and Brain Sciences.

[12]  Anna Farennikova,et al.  Seeing absence , 2012, Philosophical Studies.

[13]  C. Buss,et al.  Children's Brain Development Benefits from Longer Gestation , 2011, Front. Psychology.

[14]  Karl J. Friston,et al.  The graphical brain: Belief propagation and active inference , 2017, Network Neuroscience.

[15]  H. Lau,et al.  Empirical support for higher-order theories of conscious awareness , 2011, Trends in Cognitive Sciences.

[16]  B. Baars A cognitive theory of consciousness , 1988 .

[17]  J B Poline,et al.  Cerebral mechanisms of word masking and unconscious repetition priming , 2001, Nature Neuroscience.

[18]  Richard Brown The HOROR theory of phenomenal consciousness , 2015 .

[19]  J. Hohwy Prediction error minimization, mental and developmental disorder, and statistical theories of consciousness , 2015 .

[20]  S. Dehaene,et al.  Brain Dynamics Underlying the Nonlinear Threshold for Access to Consciousness , 2007, PLoS biology.

[21]  S Dehaene,et al.  A neuronal model of a global workspace in effortful cognitive tasks. , 1998, Proceedings of the National Academy of Sciences of the United States of America.

[22]  M. Overgaard,et al.  Introspection and subliminal perception , 2004 .

[23]  J. Duncan The multiple-demand (MD) system of the primate brain: mental programs for intelligent behaviour , 2010, Trends in Cognitive Sciences.

[24]  J. Hohwy The Predictive Mind , 2013 .

[25]  J. Changeux,et al.  Experimental and Theoretical Approaches to Conscious Processing , 2011, Neuron.

[26]  W. Newsome,et al.  Context-dependent computation by recurrent dynamics in prefrontal cortex , 2013, Nature.

[27]  Kristoffer Hougaard Madsen,et al.  An fMRI study of the neural correlates of graded visual perception , 2006, NeuroImage.

[28]  H. Lau A higher order Bayesian decision theory of consciousness. , 2008, Progress in brain research.

[29]  A. Nieder,et al.  Comparison of abstract decision encoding in the monkey prefrontal cortex, the presupplementary, and cingulate motor areas. , 2013, Journal of neurophysiology.

[30]  Bhaskara Marthi,et al.  A generative vision model that trains with high data efficiency and breaks text-based CAPTCHAs , 2017, Science.

[31]  M. Graziano Consciousness and the Social Brain , 2013 .

[32]  N. Block Perceptual consciousness overflows cognitive access , 2011, Trends in Cognitive Sciences.

[33]  W. Singer,et al.  Neuroscience and Biobehavioral Reviews Distilling the Neural Correlates of Consciousness , 2022 .

[34]  Rocco J. Gennaro Disturbed Consciousness: New Essays on Psychopathology and Theories of Consciousness , 2015 .

[35]  Judea Pearl,et al.  Probabilistic reasoning in intelligent systems - networks of plausible inference , 1991, Morgan Kaufmann series in representation and reasoning.

[36]  C. Summerfield,et al.  Expectation in perceptual decision making: neural and computational mechanisms , 2014, Nature Reviews Neuroscience.

[37]  Block's Overflow Argument , 2017 .

[38]  Jorge Morales,et al.  Minority reports: Consciousness and the prefrontal cortex , 2019, Mind & Language.

[39]  J. Dokic,et al.  Seeing Absence or Absence of Seeing , 2013 .

[40]  V. Lamme,et al.  No-Report Paradigms: Extracting the True Neural Correlates of Consciousness , 2015, Trends in Cognitive Sciences.

[41]  Lawrence Weiskrantz,et al.  Consciousness Lost and Found: A Neuropsychological Exploration , 1999 .

[42]  D. Stoljar,et al.  Blockheads! Essays on Ned Block's Philosophy of Mind and Consciousness , 2019 .

[43]  Nathaniel D. Daw,et al.  Self-Evaluation of Decision-Making: A General Bayesian Framework for Metacognitive Computation , 2017, Psychological review.

[44]  Yael Niv,et al.  A State Representation for Reinforcement Learning and Decision-Making in the Orbitofrontal Cortex , 2018 .

[45]  R. Passingham,et al.  Relative blindsight in normal observers and the neural correlate of visual consciousness , 2006, Proceedings of the National Academy of Sciences.

[46]  A. Yuille,et al.  Object perception as Bayesian inference. , 2004, Annual review of psychology.

[47]  D. M. Green,et al.  Signal detection theory and psychophysics , 1966 .

[48]  V. Walsh,et al.  Subjective discriminability of invisibility: A framework for distinguishing perceptual and attentional failures of awareness , 2010, Consciousness and Cognition.