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Blindsight in normal observers

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Abstract

SOME patients with lesions in visual cortex lack conscious visual experience but, when tested, exhibit a significant ability, termed 'blindsight', to discriminate visual stimuli1–3,27. Here we report two different visual displays that induce blindsight in normal observers. Using an objective measure, we show that conscious experience remains defective at presentation times much longer (1 s) than the onset of visual sensitivity (˜60 ms). To obtain this effect, we generate a contrast between visual textures and then conceal the contrast by superimposing 'complementary' textures. Complementarity can involve either opposite motion or binocular rivalry and orthogonal orientation. In both cases, observers locate the texture contrast reliably but do not, by either subjective or objective measures, consciously experience it. Taken together with present knowledge of the visual cortical site(s) at which opposite motion and rivalrous orientation interact4–7, this observation bears upon the functional anatomy of conscious visual experience.

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References

  1. Pöppel, E., Held, R. & Frost, D. Nature 243, 295–296 (1973).

    Article  ADS  Google Scholar 

  2. Weiskrantz, L., Warrington, E. K., Sanders, M. D. & Marshall, J. Brain 97, 709–728 (1974).

    Article  CAS  Google Scholar 

  3. Storeig, P. & Cowey, A. in Progress in Brain Research Vol. 95 (eds Hicks, T. P., Molotchnikoff, S. & Ono, T.) 445–459 (Elsevier Science, Amsterdam, 1993).

    Book  Google Scholar 

  4. Qian, N. & Andersen, R. A. J. Neurosci. 14, 7367–7380 (1994).

    Article  CAS  Google Scholar 

  5. Logothetis, N. K. & Schall, J. D. Science 245, 761–763 (1989).

    Article  ADS  CAS  Google Scholar 

  6. Leopold, D. A. & Logothetis, N. K. Invest Ophth. Vis. Sci. suppl. 36, 813 (1995).

    Google Scholar 

  7. Dobbins, A., Jeo, R. & Allman, J. Soc. Neurosci. Abstr. 20, 624 (1994).

    Google Scholar 

  8. Qian, N., Andersen, R. A. & Adelson, E. H. J. Neurosci. 14, 7357–7366 (1994).

    Article  CAS  Google Scholar 

  9. Green, D. M. & Swets, J. A. Signal Detectability and Psychophysics (Wiley, New York, 1967).

    Google Scholar 

  10. Fox, R. in Binocular Vision (ed. Regan, D.) 93–110 (CRC, Boca Raton, FL, 1991).

    Google Scholar 

  11. Sidis, B. The Psychology of Suggestion (Appleton, New York, 1898).

    Google Scholar 

  12. Adams, J. K. Psychol. Bull. 54, 383–405 (1957).

    Article  CAS  Google Scholar 

  13. Marcel, A. J. Cogn. Psychol. 15, 197–237 (1983).

    Article  CAS  Google Scholar 

  14. Meeres, S. L. & Graves, R. E. Neuropsychologia 28, 1231–1237 (1990).

    Article  CAS  Google Scholar 

  15. Graves, R. E. & Jones, B. S. Cogn. Neuropsychol. 9, 487–508 (1992).

    Article  Google Scholar 

  16. Merikle, P. M. Am. Psychol. 47, 792–795 (1992).

    Article  CAS  Google Scholar 

  17. Greenwald, A. G. Am. Psychol. 47, 766–779 (1992).

    Article  CAS  Google Scholar 

  18. Schacter, D. L. Proc. natn. Acad. Sci. U.S.A. 89, 11113–11117 (1992).

    Article  ADS  CAS  Google Scholar 

  19. Farah, M. J., Monheit, M. A. & Wallace, M. A. Neuropsychologia 29, 949–958 (1991).

    Article  CAS  Google Scholar 

  20. Malik, J. & Perona, P. J. opt. Soc. Am. A 7, 923–932 (1990).

    Article  ADS  CAS  Google Scholar 

  21. Rubenstein, B. S. & Sagi, D. J. opt. Soc. Am. A 7, 1632–1642 (1990).

    Article  ADS  CAS  Google Scholar 

  22. Knierim, J. J. & Van Essen, D. C. J. Neurophysiol. 67, 961–980 (1992).

    Article  CAS  Google Scholar 

  23. Press, W. A., Knierim, J. J. & Van Essen, D. C. Soc. Neurosci. Abstr. 20, 838 (1994).

    Google Scholar 

  24. Karni, A. et al. Soc. Neurosci. Abstr. 19, 1503 (1993).

    Google Scholar 

  25. Malach, R., Amir, Y., Harel, M. & Grinvald, A. Proc. natn. Acad. Sci. U.S.A. 90, 10469–10473 (1993).

    Article  ADS  CAS  Google Scholar 

  26. Crick, F. C. & Koch, C. Nature 375, 121–123 (1995).

    Article  ADS  CAS  Google Scholar 

  27. Weiskrantz, L., Barbur, J. L. & Sahraie, A. Proc. natn. Acad. Sci. U.S.A. 92, 6122–6126 (1995).

    Article  ADS  CAS  Google Scholar 

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Authors and Affiliations

  1. Computation and Neural Systems 139-74, California Institute of Technology, Pasadena, California, 91125, USA

    F. Christopher Kolb & Jochen Braun

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  1. F. Christopher Kolb
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  2. Jochen Braun
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Kolb, F., Braun, J. Blindsight in normal observers. Nature 377, 336–338 (1995). https://doi.org/10.1038/377336a0

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