PreprintCited by 1Philosophy and Theoretical ScienceVisual perception and processing mechanismsPhenomenology and Existential Philosophy

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The unfathomable richness of seeing

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Abstract

Most experts hold that visual experience is remarkably sparse and its apparent richness is illusory. Indeed, we fail to notice the vast majority of what we think we see, and seem to rely instead on a high-level summary of a visual scene. However, we argue here that seeing is much more than noticing, and is in fact unfathomably rich. We distinguish among three levels of visual phenomenology: a high-level description of a scene based on the categorization of “objects,” an intermediate level composed of “groupings” of simple visual features such as colors, and a base-level visual field composed of “spots” and their spatial relations. We illustrate that it is impossible to see the objects that underlie a high-level description without seeing the groupings that compose them, and we cannot see the groupings without seeing the visual field to which they are bound. We then argue that the way the visual field feels—its spatial extendedness—can only be accounted for by a phenomenal structure composed of innumerable distinctions and relations. It follows that most of what we see has no functional counterpart—it cannot be used, reported, or remembered. And yet we see it.

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  • IIT offers an explanation for why intelligence and consciousness may tend to co-evolve in biological organisms: selective pressure for intelligence, acting on resource-limited substrates such as brains, typically leads to an increase in integration among the parts of a system.

    “We showed previously that IIT offers an explanation for why intelligence and consciousness may tend to co-evolve in biological organisms: selective pressure for intelligence, acting on resource-limited substrates such as brains, typically leads to an increase in integration among the parts of a system [94,95].”

    From Dissociating Artificial Intelligence from Artificial Consciousness (2024) · cites this paper as [94]

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References 73 · Cited by 1

Research works printed but not linked: 67

  1. Anton, Gabriel. 1899. "Ueber die Selbstwahrnehmung der Herderkrankungen des Gehirns durch den Kranken bei Rindenblindheit und Bindentaubheit." Archiv für Psychiatrie und Nervenkrankheiten 32 (1): 86-127. https://scholar.archive.org/work/tqwmaeclbzd23h4lxafahmx6ai/access/ia_file/crossref- pre-1909-scholarly-works/10.1007%252Fbf02116477.zip/10.1007%252Fbf02126945.pdf.
  2. Baars, B. J. 1997. "In the theatre of consciousness. Global Workspace Theory, a rigorous scientific theory of consciousness." Journal of Consciousness Studies 4 (4): 292-309.
  3. Banica, Theodora, and D. Samuel Schwarzkopf. 2016. "Induction of Kanizsa Contours Requires Awareness of the Inducing Context." PLOS ONE 11 (8): e0161177. https://doi.org/10.1371/journal.pone.0161177. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0161177. · DOI
  4. Becker, Mark W., Harold Pashler, and Stuart M. Anstis. 2000. "The Role of Iconic Memory in Change-Detection Tasks." Perception 29 (3): 273-286. https://doi.org/10.1068/p3035. https://journals.sagepub.com/doi/abs/10.1068/p3035. · DOI
  5. Behrmann, Marlene, and Ruth Kimchi. 2003. "What does visual agnosia tell us about perceptual organization and its relationship to object perception?" Journal of Experimental Psychology: Human Perception and Performance 29 (1): 19. https://psycnet.apa.org/record/2003-04481-002.
  6. Behrmann, Marlene, and Mayu Nishimura. 2010. "Agnosias." WIREs Cognitive Science 1 (2): 203- 213. https://doi.org/10.1002/wcs.42. https://onlinelibrary.wiley.com/doi/abs/10.1002/wcs.42. https://wires.onlinelibrary.wiley.com/doi/10.1002/wcs.42 · DOI
  7. ?casa_token=eEKfVC2HNFEA AAAA:RigO1setSUKU0q6RdyTp9yyoMNOXCmrLByufgy5Qrq_UGHb91Q04ukshrXCJ923w 3epOUACJTcDBhOm1. · DOI
  8. Benson, D. Frank, and John P. Greenberg. 1969. "Visual form agnosia: A specific defect in visual discrimination." Archives of Neurology 20 (1): 82-89. https://jamanetwork.com/journals/jamaneurology/article- abstract/568633?casa_token=RMwx8JdjxwcAAAAA:87LnJ0OsWcCYkQezbia31PSmrc1cP gJEVqBeEAD8eMJkv6UvEMGjJpa-IZMlRbQNmW--L1dENtg.
  9. Block, Ned. 2011. "Perceptual consciousness overflows cognitive access." Trends in cognitive sciences 15 (12): 567-575. http://www.sciencedirect.com/science/article/pii/S1364661311002221. https://secure.jbs.elsevierhealth.com/action/consumeSsoCookie?redirectUri=http%3A% 2F%2Fwww.cell.com%2Faction%2FconsumeSharedSessionAction%3FSERVER%3DWZ6m yaEXBLEt1UgI9cIkvA%253D%253D%26MAID%3DK%252FGY0fQaDSdEqu5vDcNyNg%253 D%253D%26JSESSIONID%3DaaabRoSeHpgZ9- TAnSwBv%26ORIGIN%3D859894454%26RD%3DRD&acw=&utt=.
  10. Blum, Lenore, and Manuel Blum. 2022. "A theory of consciousness from a theoretical computer science perspective: Insights from the Conscious Turing Machine." Proceedings of the National Academy of Sciences 119 (21): e2115934119. https://doi.org/10.1073/pnas.2115934119. https://www.pnas.org/doi/full/10.1073/pnas.2115934119. · DOI · Paper page
  11. Campana, Florence, Ignacio Rebollo, Anne Urai, Valentin Wyart, and Catherine Tallon-Baudry. 2016. "Conscious Vision Proceeds from Global to Local Content in Goal-Directed Tasks and Spontaneous Vision." The Journal of Neuroscience 36 (19): 5200-5213. http://www.jneurosci.org/content/36/19/5200.short.
  12. Carvajal, Juan José Romero, Augusto Alejandro Arias Cárdenas, Germán Zamora Pazmiño, and Patricio Abad Herrera. 2012. "Visual Anosognosia (Anton-Babinski Syndrome): Report of Two Cases Associated with Ischemic Cerebrovascular Disease." Journal of Behavioral and Brain Science. https://doi.org/10.4236/jbbs.2012.23045. · DOI
  13. Celesia, Gastone G., Mitchell G. Brigell, and Michael S. Vaphiades. 1997. "Hemianopic anosognosia." Neurology. https://doi.org/10.1212/WNL.49.1.88. Chen, Hui, Garrett Swan, and Brad Wyble. 2016. "Prolonged focal attention without binding: Tracking a ball for half a minute without remembering its color." Cognition 147: 144-148. https://doi.org/10.1016/j.cognition.2015.11.014. https://www.sciencedirect.com/science/article/pii/S001002771530113X. https://www.sciencedirect.com/science/article/pii/S001002771530113X?via%3Dihub. · DOI
  14. Chen, Hui, and Brad Wyble. 2015. "Amnesia for object attributes: Failure to report attended information that had just reached conscious awareness." Psychological science 26 (2): 203-210. https://journals.sagepub.com/doi/full/10.1177/0956797614560648. · DOI
  15. Chen, Hui, Jiahan Yu, Yingtao Fu, Ping Zhu, Wei Li, Jifan Zhou, and Mowei Shen. 2019. "Does attribute amnesia occur with the presentation of complex, meaningful stimuli? The answer is, "it depends"." Memory & Cognition 47 (6): 1133-1144. https://doi.org/10.3758/s13421-019-00923-7. https://doi.org/10.3758/s13421-019- 00923-7. · DOI
  16. Chisholm, Roderick. 1942. "The problem of the speckled hen." Mind 51 (204): 368-373. https://www.jstor.org/stable/2250939.
  17. Cohen, Michael A., Thomas L. Botch, and Caroline E. Robertson. 2020. "The limits of color awareness during active, real-world vision." Proceedings of the National Academy of Sciences.
  18. Cohen, Michael A., Daniel C. Dennett, and Nancy Kanwisher. 2016. "What is the Bandwidth of Perceptual Experience?" Trends in Cognitive Sciences 20 (5): 324-335. https://doi.org/http://dx.doi.org/10.1016/j.tics.2016.03.006. http://www.sciencedirect.com/science/article/pii/S1364661316000668. · DOI
  19. Dehaene, Stanislas, and Jean-Pierre Changeux. 2011. "Experimental and Theoretical Approaches to Conscious Processing." Neuron 70 (2): 200-227. https://doi.org/10.1016/j.neuron.2011.03.018. http://www.sciencedirect.com/science/article/pii/S0896627311002583. · DOI · Paper page
  20. Delvenne, Jean-François, Xavier Seron, Françoise Coyette, and Bruno Rossion. 2004. "Evidence for perceptual deficits in associative visual (prosop)agnosia: a single-case study." Neuropsychologia 42 (5): 597-612. https://doi.org/10.1016/j.neuropsychologia.2003.10.008. https://www.sciencedirect.com/science/article/pii/S0028393203002756. · DOI
  21. Dennett, Daniel C. 1991. Consciousness explained. Penguin UK.
  22. Devinsky, Orrin, Martha J. Farah, and William B. Barr. 2008. "Chapter 21 Visual agnosia." In Handbook of Clinical Neurology, In Neuropsychology and Behavioral Neurology, 417-427. Elsevier.
  23. Eitam, Baruch, Roy Shoval, and Yaffa Yeshurun. 2015. "Seeing without knowing: task relevance dissociates between visual awareness and recognition." Annals of the New York Academy of Sciences 1339 (1): 125-137. https://doi.org/10.1111/nyas.12673. https://nyaspubs.onlinelibrary.wiley.com/doi/abs/10.1111/nyas.12673. https://nyaspubs.onlinelibrary.wiley.com/doi/full/10.1111/nyas.12673. · DOI
  24. Ellia, Francesco, Jeremiah Hendren, Matteo Grasso, Csaba Kozma, Garrett Mindt, Jonathan P. Lang, Andrew M. Haun, Larissa Albantakis, Melanie Boly, and Giulio Tononi. 2021. "Consciousness and the fallacy of misplaced objectivity." Neuroscience of Consciousness 2021 (2): niab032. https://academic.oup.com/nc/article/2021/2/niab032/6398202.
  25. Fantl, Jeremy, and Robert Howell. 2003. "Sensations, swatches, and speckled hens." Pacific Philosophical Quarterly 84 (4): 371-383. https://onlinelibrary.wiley.com/doi/full/10.1046/j.1468-0114.2003.00179.x. · DOI
  26. Fodor, Jerry A. 1975. The language of thought. Vol. 5. Harvard university press.
  27. Forde, Emer M. E., and Claus-W. Wallesch. 2002. "'Mind-blind for blindness': A psychological review of Anton's syndrome." In Classic Cases in Neuropsychology, Volume II. Psychology Press.
  28. Grasso, Matteo, Andrew M. Haun, and Giulio Tononi. 2021. "Of maps and grids." Neuroscience of Consciousness 2021 (2): niab022. https://academic.oup.com/nc/article/2021/2/niab022/6372980. https://academic.oup.com/nc/article/2021/2/niab022/6372980?login=true.
  29. Haun, Andrew M., and Giulio Tononi. 2019. "Why Does Space Feel the Way it Does? Towards a Principled Account of Spatial Experience." Entropy 21 (12): 1160. https://doi.org/10.3390/e21121160. https://www.mdpi.com/1099-4300/21/12/1160. · DOI · Paper page
  30. Haun, Andrew M., Giulio Tononi, Christof Koch, and Naotsugu Tsuchiya. 2017. "Are we underestimating the richness of visual experience?" Neuroscience of Consciousness 2017 (1). https://doi.org/10.1093/nc/niw023. https://academic.oup.com/nc/article/2017/1/niw023/2970153. · DOI
  31. Hole, Graham J. 1996. "Decay and interference effects in visuospatial short-term memory." Perception 25 (1): 53-64. https://journals.sagepub.com/doi/abs/10.1068/p250053. · DOI
  32. Jastrow, J. 1899. "The Mind's Eye." Popular Science Monthly LIV: 299-312. http://psycnet.apa.org/record/1899-10112-001.
  33. Kaufman, Edna L., Miles W. Lord, Thomas Whelan Reese, and John Volkmann. 1949. "The discrimination of visual number." The American journal of psychology 62 (4): 498-525. https://www.jstor.org/stable/1418556?casa_token=5YVTHdpI0Y0AAAAA:irlksTytbOiD91 v9pqBBwyVSPsNzIVKIxm73LakDpLsTi7RGnpebuJ2cHYOeURvQ8aiDq1qOsUtuERGK8bx23 xQZdiYRxp8vGFFjw7bfR5b856VTIe4O.
  34. Kihlstrom, John F. 2004. "Joseph Jastrow and his duck-or is it a rabbit." of Trends in the Cognitive Sciences (TICS)), last visited 31 (07): 2007. https://www.ocf.berkeley.edu/~jfkihlstrom/JastrowDuck.htm.
  35. Koch, C., and N. Tsuchiya. 2007. "Attention and consciousness: two distinct brain processes." Trends in Cognitive Sciences 11: 16-22. https://doi.org/10.1016/j.tics.2006.10.012. · DOI · Paper page
  36. Konkle, Talia, Timothy F. Brady, George A. Alvarez, and Aude Oliva. 2010a. "Conceptual distinctiveness supports detailed visual long-term memory for real-world objects." Journal of experimental Psychology: general 139 (3): 558.
  37. ---. 2010b. "Scene Memory Is More Detailed Than You Think: The Role of Categories in Visual Long-Term Memory." Psychological Science 21 (11): 1551-1556. https://doi.org/10.1177/0956797610385359. https://doi.org/10.1177/0956797610385359. · DOI · Paper page
  38. Kornmeier, Jürgen, and Michael Bach. 2012. "Ambiguous figures-what happens in the brain when perception changes but not the stimulus." Frontiers in human neuroscience 6: 51. https://www.frontiersin.org/articles/10.3389/fnhum.2012.00051/full. · DOI
  39. Lamme, Victor A. F. 2010. "How neuroscience will change our view on consciousness." Cognitive neuroscience 1 (3): 204-220. https://doi.org/10.1080/17588921003731586. https://pubmed.ncbi.nlm.nih.gov/24168336/. · DOI · Paper page
  40. Liang, Paul Pu. 2022. "Brainish: Formalizing A Multimodal Language for Intelligence and Consciousness." arXiv preprint arXiv:2205.00001. · arXiv
  41. Maddula, Mohana, Stuart Lutton, and Breffni Keegan. 2009. "Anton's syndrome due to cerebrovascular disease: a case report." Journal of Medical Case Reports 3 (1): 9028. https://doi.org/10.4076/1752-1947-3-9028. https://doi.org/10.4076/1752-1947-3-9028. · DOI
  42. Magnussen, Svein, Mark W. Greenlee, Rolf Asplund, and Stein Dyrnes. 1991. "Stimulus-specific mechanisms of visual short-term memory." Vision research 31 (7-8): 1213-1219. https://www.sciencedirect.com/science/article/pii/0042698991900468.
  43. Milner, A. David, David I. Perrett, Rhona S. Johnston, Philip J. Benson, Timothy R. Jordan, David W. Heeley, Diego Bettucci, Franco Mortara, Roberto Mutani, and Emanuela Terazzi. 1991. "Perception and action in 'visual form agnosia'." Brain 114 (1): 405-428. https://academic.oup.com/brain/article/114/1/405/271027.
  44. Mooney, Craig M. 1957. "Age in the development of closure ability in children." Canadian Journal of Psychology/Revue canadienne de psychologie 11 (4): 219.
  45. Moore, Cassandra, and Patrick Cavanagh. 1998. "Recovery of 3D volume from 2-tone images of novel objects." Cognition 67 (1): 45-71. https://doi.org/10.1016/S0010-0277(98)00014-6. http://www.sciencedirect.com/science/article/pii/S0010027798000146. https://www.sciencedirect.com/science/article/pii/S0010027798000146. · DOI
  46. Moors, Pieter, Johan Wagemans, Raymond van Ee, and Lee de-Wit. 2016. "No evidence for surface organization in Kanizsa configurations during continuous flash suppression." Attention, Perception, & Psychophysics 78 (3): 902-914. https://doi.org/10.3758/s13414- 015-1043-x. https://doi.org/10.3758/s13414-015-1043-x. · DOI
  47. Nanay, Bence. 2009. "How speckled is the hen?" Analysis 69 (3): 499-502. https://www.jstor.org/stable/40607667.
  48. O'Regan, J. Kevin, and Alva Noë. 2001. "A sensorimotor account of vision and visual consciousness." Behavioral and Brain Sciences 24 (5): 939-973. https://doi.org/10.1017/S0140525X01000115. https://www.cambridge.org/core/journals/behavioral-and-brain- sciences/article/sensorimotor-account-of-vision-and-visual- consciousness/BA1638CB7389102A12B336CE687EC270. · DOI · Paper page
  49. Overgaard, Morten. 2011. "Visual experience and blindsight: a methodological review." Experimental Brain Research 209 (4): 473-479. http://link.springer.com/article/10.1007/s00221-011-2578-2. https://link.springer.com/article/10.1007/s00221-011-2578-2. · DOI · Paper page
  50. Overgaard, Morten, Katrin Fehl, Kim Mouridsen, Bo Bergholt, and Axel Cleeremans. 2008. "Seeing without Seeing? Degraded Conscious Vision in a Blindsight Patient." PLOS ONE 3 (8): e3028. https://doi.org/10.1371/JOURNAL.PONE.0003028. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0003028. · DOI
  51. Pollen, Daniel A. 1999. "On the Neural Correlates of Visual Perception." Cerebral Cortex 9 (1): 4- 19. https://doi.org/10.1093/cercor/9.1.4. http://cercor.oxfordjournals.org/content/9/1/4. · DOI
  52. Pélisson, D., C. Prablanc, M. A. Goodale, and M. Jeannerod. 1986. "Visual control of reaching movements without vision of the limb." Experimental Brain Research 62 (2): 303-311. https://doi.org/10.1007/BF00238849. https://doi.org/10.1007/BF00238849. · DOI
  53. Ramachandran, Vilayanur S., and William Hirstein. 1999. "The science of art: A neurological theory of aesthetic experience." Journal of consciousness Studies 6 (6-7): 15-51.
  54. Rensink, Ronald A., J. Kevin O'Regan, and James J. Clark. 1997. "To See or not to See: The Need for Attention to Perceive Changes in Scenes." Psychological Science 8 (5): 368-373. https://doi.org/10.1111/j.1467-9280.1997.tb00427.x. https://doi.org/10.1111/j.1467- 9280.1997.tb00427.x. · DOI
  55. Rose, David. 1999. "The historical roots of the theories of local signs and labelled lines." Perception 28 (6): 675-685. http://pec.sagepub.com/content/28/6/675.short.
  56. Simons, Daniel J., and Christopher F. Chabris. 1999. "Gorillas in our midst: Sustained inattentional blindness for dynamic events." perception 28 (9): 1059-1074. https://journals.sagepub.com/doi/abs/10.1068/p281059?casa_token=nX0dzrj8U1IAAA AA%3Ah8TCQspwvNcnorl0Qt39G8qhOg6kEln7- ZSIs_g_0Bo2bZS8wnfZisxO_e3BVai4SC5tYi-98H95320. · DOI · Paper page
  57. Sperling, George. 1960. "The information available in brief visual presentations." Psychological monographs: General and applied 74 (11): 1-29. http://www.psycontent.com/index/C61284618287157X.pdf. http://www.psycontent.com/content/c61284618287157x/.
  58. Standing, Lionel. 1973. "Learning 10000 pictures." Quarterly Journal of Experimental Psychology 25 (2): 207-222. https://doi.org/10.1080/14640747308400340. https://doi.org/10.1080/14640747308400340. · DOI · Paper page
  59. Sterzer, Philipp, Andreas Kleinschmidt, and Geraint Rees. 2009. "The neural bases of multistable perception." Trends in cognitive sciences 13 (7): 310-318. https://www.sciencedirect.com/science/article/pii/S1364661309001193.
  60. Tam, Joyce, and Brad Wyble. 2023. "Location has a privilege, but it is limited: Evidence from probing task-irrelevant location." Journal of Experimental Psychology: Learning, Memory, and Cognition 49 (7): 1051. https://psycnet.apa.org/record/2022-77980-001.
  61. Taves, Ernest Henry. 1941. "Two mechanisms for the perception of visual numerousness." Archives of Psychology (Columbia University). https://psycnet.apa.org/record/1942- 02594-001.
  62. Usher, Marius, Zohar Z. Bronfman, Shiri Talmor, Hilla Jacobson, and Baruch Eitam. 2018. "Consciousness without report: insights from summary statistics and inattention 'blindness'." Philosophical Transactions of the Royal Society B: Biological Sciences 373 (1755): 20170354. https://doi.org/10.1098/rstb.2017.0354. https://royalsocietypublishing.org/doi/full/10.1098/rstb.2017.0354. · DOI
  63. Vecera, Shaun P., and Marlene Behrmann. 1997. "Spatial attention does not require preattentive grouping." Neuropsychology 11 (1): 30-43. https://doi.org/10.1037/0894-4105.11.1.30. https://psycnet.apa.org/record/1997-08159-003. · DOI
  64. Vecera, Shaun P., and Kendra S. Gilds. 1997. "What Is It Like to Be a Patient with Apperceptive Agnosia?" Consciousness and Cognition 6 (2): 237-266. https://doi.org/10.1006/ccog.1997.0304. https://www.sciencedirect.com/science/article/pii/S1053810097903044. · DOI
  65. Ward, Emily J. 2018. "Downgraded phenomenology: how conscious overflow lost its richness." Philosophical Transactions of the Royal Society B: Biological Sciences 373 (1755): 20170355. https://royalsocietypublishing.org/doi/full/10.1098/rstb.2017.0355. · DOI
  66. Ward, Emily J., Adam Bear, and Brian J. Scholl. 2016. "Can you perceive ensembles without perceiving individuals?: The role of statistical perception in determining whether awareness overflows access." Cognition 152: 78-86. https://doi.org/10.1016/j.cognition.2016.01.010. http://www.sciencedirect.com/science/article/pii/S0010027716300105. · DOI
  67. Zukić, Sanela, Osman Sinanović, Lejla Zonić, Renata Hodžić, Svjetlana Mujagić, and Edina Smajlović. 2014. "Anton's Syndrome due to Bilateral Ischemic Occipital Lobe Strokes." Case Reports in Neurological Medicine. https://doi.org/10.1155/2014/474952. · DOI

Metadata

Authors
Haun, A., & Tononi, G.
Affiliations
University of Wisconsin–Madison (US)
Published
2024-04-19
OpenAlex
W4394947798
Cited by
1
References
73
Citations by year
2025: 1
Type
posted content
Language
en
Open access
Locations
PsyArXiv (OSF Preprints) (submittedVersion, public-domain)
Topics
  • Social Sciences › Arts and Humanities › Philosophy › Philosophy and Theoretical Science
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
  • Social Sciences › Arts and Humanities › Philosophy › Phenomenology and Existential Philosophy
Keywords
visual experience, visual phenomenology, object classification, feature grouping, visual field, visual perception

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