David Bourget (Western Ontario)
David Chalmers (ANU, NYU)
Rafael De Clercq
Jack Alan Reynolds
Learn more about PhilPapers
Consciousness and Cognition 11 (4):568-581 (2002)
Listening to subject’s commentaries can be a useful spur to novel scientific departures, as in studies of blindsight. Recently further testing has been possible with subject DB, who was a blindsight patient tested intensively over a period of 10 years and who was the subject of the book, . Essentially his original capacity is the same or somewhat more sensitive. Some further types of discriminations have now been tested that were not possible in the original study. But a new feature was discovered, namely that he describes conscious after-images of a wide range of inducing stimuli of which he is unconscious. The properties of the after-images are briefly described, such as their occurrence following unseen colour patches, luminance changes, shape, spatial frequency, their long durations, showing inter-ocular transfer, as well as their conforming to Emmert’s Law. Various approaches are discussed towards finding the source of their generation, such as the use of after-images of colour mixes of separate inputs to the two eyes . They are also discussed in terms of after-images in normal subjects that are generated by imagination. The discovery offers a rare potential opportunity to compare the brain activity associated with both the conscious and unconscious attributes of the precisely the same stimuli in the same locus in the same subject
|Keywords||*Afterimage *Consciousness States *Visual Perception|
|Categories||categorize this paper)|
Setup an account with your affiliations in order to access resources via your University's proxy server
Configure custom proxy (use this if your affiliation does not provide a proxy)
|Through your library|
References found in this work BETA
No references found.
Citations of this work BETA
Ian Phillips (2013). Afterimages and Sensation. Philosophy and Phenomenological Research 87 (2):417-453.
John Smythies (2009). A Critique of Revonsuo's Theory of Consciousness. Philosophical Psychology 22 (1):99 – 106.
Similar books and articles
Christopher Mole & Sean D. Kelly (2006). On the Demonstration of Blindsight in Monkeys. Mind and Language 21 (4):475-483.
Mark C. Price (2001). Now You See It, Now You Don't: Preventing Consciousness with Visual Masking. In Peter G. Grossenbacher (ed.), Finding Consciousness in the Brain: A Neurocognitive Approach. Advances in Consciousness Research. John Benjamins. 25-60.
Edmund T. Rolls (2006). Consciousness Absent and Present: A Neurophysiological Exploration of Masking. In Haluk Ögmen & Bruno G. Breitmeyer (eds.), The First Half Second: The Microgenesis and Temporal Dynamics of Unconscious and Conscious Visual Processes. Mit Press. 89-108.
Morten Overgaard (2011). Visual Experience and Blindsight: A Methodological Review. Experimental Brain Research 209:473-479.
Morten Overgaard, Julian Rote, Kim Mouridsen & Thomas Zoega Ramsoy (2006). Is Conscious Perception Gradual or Dichotomous? A Comparison of Report Methodologies During a Visual Task. Consciousness and Cognition 15 (4):700-708.
Anthony J. Marcel (1998). Blindsight and Shape Perception: Deficit of Visual Consciousness or of Visual Function? Brain 121:1565-88.
Juha Silvanto (2008). A Re-Evaluation of Blindsight and the Role of Striate Cortex (V1) in Visual Awareness. Neuropsychologia.
Hakwan C. Lau & Richard E. Passingham (2006). Relative Blindsight in Normal Observers and the Neural Correlate of Visual Consciousness. Proceedings of the National Academy of Sciences of the United States of America 103 (49):18763-18768.
Basileios Kroustallis (2005). Blindsight. Philosophical Psychology 18 (1):31-43.
Ceri T. Trevethan, Arash Sahraie & Larry Weiskrantz (2007). Can Blindsight Be Superior to 'Sighted-Sight?'. Cognition 103 (3):491-501.
Added to index2009-01-28
Total downloads72 ( #25,235 of 1,692,596 )
Recent downloads (6 months)1 ( #181,402 of 1,692,596 )
How can I increase my downloads?