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)|
References found in this work BETA
Residual Function After Brain Wounds Involving the Central Visual Pathways in Man.Ernst Poppel, R. Held & D. Frost - 1973 - Nature 243:295-96.
The Neurobiology of Blindsight.Alan Cowey & Petra Stoerig - 1991 - Trends in Neurosciences 14:140-5.
Blindsight - Putting Beta (?) on the Back Burner.Lawrence Weiskrantz - 2001 - In Beatrice De Gelder, Edward H. F. De Haan & Charles A. Heywood (eds.), Out of Mind: Varieties of Unconscious Processes. Oxford University Press. pp. 20-31.
Commentary Responses and Conscious Awareness in Humans: The Implications for Awareness in Non-Human Animals.Lawrence Weiskrantz - 2001 - Animal Welfare. Special Issue 10:41- 46.
Citations of this work BETA
Afterimages and Sensation.Ian Phillips - 2013 - Philosophy and Phenomenological Research 87 (2):417-453.
Direct Assessment of Qualia in a Blindsight Participant.N. Persaud & H. Lau - 2008 - Consciousness and Cognition 17 (3):1046-1049.
Perceptual Objectivity and Consciousness: A Relational Response to Burge’s Challenge.Naomi Eilan - 2015 - Topoi:1-12.
Similar books and articles
On the Demonstration of Blindsight in Monkeys.Christopher Mole & Sean D. Kelly - 2006 - Mind and Language 21 (4):475-483.
Now You See It, Now You Don't: Preventing Consciousness with Visual Masking.Mark C. Price - 2001 - In Peter G. Grossenbacher (ed.), Finding Consciousness in the Brain: A Neurocognitive Approach. Advances in Consciousness Research. John Benjamins. pp. 25-60.
Consciousness Absent and Present: A Neurophysiological Exploration of Masking.Edmund T. Rolls - 2006 - In Haluk Ögmen & Bruno G. Breitmeyer (eds.), The First Half Second: The Microgenesis and Temporal Dynamics of Unconscious and Conscious Visual Processes. MIT Press. pp. 89-108.
Visual Experience and Blindsight: A Methodological Review.Morten Overgaard - 2011 - Experimental Brain Research 209:473-479.
Is Conscious Perception Gradual or Dichotomous? A Comparison of Report Methodologies During a Visual Task.Morten Overgaard, Julian Rote, Kim Mouridsen & Thomas Zoega Ramsoy - 2006 - Consciousness and Cognition 15 (4):700-708.
Blindsight and Shape Perception: Deficit of Visual Consciousness or of Visual Function?Anthony J. Marcel - 1998 - Brain 121:1565-88.
A Re-Evaluation of Blindsight and the Role of Striate Cortex (V1) in Visual Awareness.Juha Silvanto - 2008 - Neuropsychologia.
Relative Blindsight in Normal Observers and the Neural Correlate of Visual Consciousness.Hakwan C. Lau & Richard E. Passingham - 2006 - Proceedings of the National Academy of Sciences of the United States of America 103 (49):18763-18768.
Added to index2009-01-28
Total downloads89 ( #56,676 of 2,154,175 )
Recent downloads (6 months)1 ( #397,226 of 2,154,175 )
How can I increase my downloads?