Search results for 'blindsight' (try it on Scholar)

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  1.  13
    J. Campion, R. Latto & Y. Smith (1983). Is Blindsight an Effect of Scattered Light, Spared Cortex, and Near-Threshold Vision? Behavioral and Brain Sciences 6 (3):423-86.
    Blindsight is the term commonly used to describe visually guided behaviour elicited by a stimulus falling within the scotoma (blind area) caused by a lesion of the striate cortex. Such is normally held to be unconscious and to be mediated by subcortical pathways involving the superior colliculus. Blindsight is of considerable theoretical importance since it suggests that destriate man is more like destriate monkey than had been previously believed and also because it supports the classical notion of two (...)
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  2. Berit Brogaard (2012). Non-Visual Consciousness and Visual Images in Blindsight. Consciousness and Cognition 21 (1):595-596.
    In a recent response paper to Brogaard (2011a), Morten Overgaard and Thor Grünbaum argue that my case for the claim that blindsight subjects are not visually conscious of the stimuli they correctly identify rests on a mistaken necessary criterion for determining whether a conscious experience is visual or non-visual. Here I elaborate on the earlier argu- ment while conceding that the question of whether blindsight subjects are visually con- scious of the visual stimuli they correctly identify largely is (...)
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  3.  21
    Fiona Macpherson (2015). The Structure of Experience, the Nature of the Visual, and Type 2 Blindsight‌. Consciousness and Cognition 32:104 - 128.
    Unlike those with type 1 blindsight, people who have type 2 blindsight have some sort of consciousness of the stimuli in their blind field. What is the nature of that consciousness? Is it visual experience? I address these questions by considering whether we can establish the existence of any structural—necessary—features of visual experience. I argue that it is very difficult to establish the existence of any such features. In particular, I investigate whether it is possible to (...)
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  4.  36
    Ali Jannati & Vincent Di Lollo (2012). Relative Blindsight Arises From a Criterion Confound in Metacontrast Masking: Implications for Theories of Consciousness. Consciousness and Cognition 21 (1):307-314.
    Relative blindsight is said to occur when different levels of subjective awareness are obtained at equality of objective performance. Using metacontrast masking, Lau and Passingham reported relative blindsight in normal observers at the shorter of two stimulus-onset asynchronies between target and mask. Experiment 1 replicated the critical asymmetry in subjective awareness at equality of objective performance. We argue that this asymmetry cannot be regarded as evidence for relative blindsight because the observers’ responses were based on different (...)
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  5. Sean Allen-Hermanson (2010). Blindsight in Monkeys: Lost and (Perhaps) Found. Journal of Consciousness Studies 17 (1-2): 47-71.
    Stoerig and Cowey’s work is widely regarded as showing that monkeys with lesions in the primary visual cortex have blindsight. However, Mole and Kelly persuasively argue that the experimental results are compatible with an alternative hypothesis positing only a deficit in attention and perceptual working memory. I describe a revised procedure which can distinguish these hypotheses, and offer reasons for thinking that the blindsight hypothesis provides a superior explanation. The study of blindsight might contribute towards a general (...)
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  6.  92
    Basileios Kroustallis (2005). Blindsight. Philosophical Psychology 18 (1):31-43.
    Blindsight is the ability of patients with an impaired visual cortex to perform visually in their blind field without acknowledging that performance. This ability has been interpreted as a sign of the absence of phenomenal consciousness, and neuroscientific studies have extensively studied cases of it. Different proposals separate visual form recognition from motion perception, and attempt to show that either the former or the latter is solely responsible for blindsight performance. However, a review of current experimental evidence shows (...)
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  7.  5
    Lindsay D. Oliver, Alexander Mao & Derek G. V. Mitchell (2015). Blindsight” and Subjective Awareness of Fearful Faces: Inversion Reverses the Deficits in Fear Perception Associated with Core Psychopathic Traits. Cognition and Emotion 29 (7):1256-1277.
    Though emotional faces preferentially reach awareness, the present study utilised both objective and subjective indices of awareness to determine whether they enhance subjective awareness and “blindsight”. Under continuous flash suppression, participants localised a disgusted, fearful or neutral face (objective index), and rated their confidence (subjective index). Psychopathic traits were also measured to investigate their influence on emotion perception. As predicted, fear increased localisation accuracy, subjective awareness and “blindsight” of upright faces. Coldhearted traits were inversely related to subjective awareness, (...)
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  8. Lawrence Weiskrantz (1986). Blindsight: A Case Study and Implications. Oxford University Press.
    within-field task as testing proceeded. (In any case, the two-field task is presumably a more difficult one than the one-field task. ...
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  9.  66
    Robert W. Kentridge, Charles A. Heywood & Lawrence Weiskrantz (1999). Attention Without Awareness in Blindsight. Proceedings of the Royal Society of London B 266:1805-11.
  10.  58
    Berit Brogaard, Kristian Marlow & Kevin Rice (2014). Unconscious Influences on Decision Making in Blindsight. Behavioral and Brain Sciences 37 (1):22-23.
  11.  49
    Thomas Natsoulas (1997). Blindsight and Consciousness. American Journal of Psychology 110:1-33.
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  12.  71
    James Danckert & Melvyn A. Goodale (2000). Blindsight: A Conscious Route to Unconscious Vision. Current Biology 10 (1):31-43.
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  13.  6
    J. Zihl (1980). "Blindsight": Improvement of Visually Guided Eye Movements by Systematic Practice in Patients with Cerebral Blindness. Neuropsychologia 18 (1):71-77.
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  14.  3
    Ema Sullivan-Bissett (2012). Changing Approaches to Blindsight: Relevant, but Not Decisive: Reply to Foley. Philosophical Writings:56-60.
  15.  8
    Lawrence Weiskrantz (2000). Blindsight: Implications for the Conscious Experience of Emotion. In Richard D. R. Lane, L. Nadel & G. L. Ahern (eds.), Cognitive Neuroscience of Emotion. Oxford University Press 31-43.
  16. Lawrence Weiskrantz (1995). Blindsight: Conscious Vs. Unconscious Aspects. In Joseph E. King & Karl H. Pribram (eds.), Scale in Conscious Experience. Lawrence Erlbaum 31-43.
  17. Lawrence Weiskrantz (1995). Blindsight: Not an Island Unto Itself. Current Directions in Psychological Science 4 (1):146-151.
     
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  18. Morten Overgaard (2011). Visual Experience and Blindsight: A Methodological Review. Experimental Brain Research 209:473-479.
    Blindsight is classically defined as residual visual capacity, e.g., to detect and identify visual stimuli, in the total absence of perceptual awareness following lesions to V1. However, whereas most experiments have investigated what blindsight patients can and cannot do, the literature contains several, often contradictory, remarks about remaining visual experience. This review examines closer these remarks as well as experiments that directly approach the nature of possibly spared visual experiences in blindsight.
     
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  19.  21
    Morten Overgaard & Thor Grünbaum (2011). Consciousness and Modality: On the Possible Preserved Visual Consciousness in Blindsight Subjects. Consciousness and Cognition 20 (4):1855-1859.
    In a recent paper, Brogaard presents counter-arguments to the conclusions of an experiment with blindsight subject GR. She argues that contrary to the apparent findings that GR’s preserved visual abilities relate to degraded visual experiences, she is in fact fully unconscious of the stimuli she correctly identifies. In this paper, we present arguments and evidence why Brogaard’s argument does not succeed in its purpose. We suggest that not only is relevant empirical evidence in opposition to Brogaard’s argument, her argument (...)
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  20. Berit Brogaard (2011). Color Experience in Blindsight? Philosophical Psychology 24 (6):767 - 786.
    Blindsight, the ability to blindly discriminate wavelength and other aspects of stimuli in a blind field, sometimes occurs in people with lesions to striate (V1) cortex. There is currently no consensus on whether qualitative color information of the sort that is normally computed by double opponent cells in striate cortex is indeed computed in blindsight but doesn?t reach awareness, perhaps owing to abnormal neuron responsiveness in striate or extra-striate cortical areas, or is not computed at all. The existence (...)
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  21.  19
    N. Persaud & H. Lau (2008). Direct Assessment of Qualia in a Blindsight Participant. Consciousness and Cognition 17 (3):1046-1049.
    Experimenters generally infer whether participants have visual experiences based on metacognitive responses. We showed a well-studied blindsight participant, GY, several definitions of the term “qualia” and then questioned him about whether he felt or he experienced qualia in his normal and blind fields. We found, contrary to others who have used different methods for measuring qualia, that GY does not have qualia for stationary stimuli in his blind field. This novel method for directly assessing qualia embraces the idea that (...)
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  22. Lawrence Weiskrantz (2009). Blindsight: A Case Study Spanning 35 Years and New Developments. OUP Oxford.
    The first edition of Blindsight, written by Lawrence Weiskrantz was an important and highly cited account of studies of the phenomenon - Blindsight. The updated edition retains the original text of the first edition, but brings the book up to date with developments in this area in the past decade.
     
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  23.  86
    Lawrence Weiskrantz (2002). Prime-Sight and Blindsight. Consciousness and Cognition 11 (4):568-581.
    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 (...)
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  24.  85
    Paul Azzopardi & Alan Cowey (1998). Blindsight and Visual Awareness. Consciousness and Cognition 7 (3):292-311.
    Some patients with damaged striate cortex have blindsight-the ability to discriminate unseen stimuli in their clinically blind visual field defects when forced-choice procedures are used. Blindsight implies a sharp dissociation between visual performance and visual awareness, but signal detection theory indicates that it might be indistinguishable from the behavior of normal subjects near the lower limit of conscious vision, where the dissociations could arise trivially from using different response criteria during clinical and forced-choice tests. We tested the latter (...)
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  25.  12
    N. Persaud & A. Cowey (2008). Blindsight is Unlike Normal Conscious Vision: Evidence From an Exclusion Task. Consciousness and Cognition 17 (3):1050-1055.
    We explored whether information processed subconsciously in blindsight is qualitatively different from normal conscious processing. On each trial the blindsight patient GY was presented with a square-wave grating either in an upper or lower quadrant of his visual field and was asked to report the opposite of its location . We found that while GY was able to follow these exclusion instructions in his normal field, he tended to erroneously respond with the real location when the grating appeared (...)
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  26.  67
    Robert N. McCauley (1993). Why the Blind Can't Lead the Blind: Dennett on the Blind Spot, Blindsight, and Sensory Qualia. Consciousness and Cognition 2 (2):155-64.
    In Consciousness Explained Dan Dennett proposes a deflationary treatment of sensory qualia. He seeks to establish a continuity among both the neural and the conscious phenomena connected with the blind spot and with the perception of repetitive patterns on the one hand and the neutral and conscious phenomena connected with blindsight on the other. He aims to analyze the conscious phenomena associated with each in terms of what the brain ignores. Dennett offers a thought experiment about a blindsight (...)
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  27.  31
    Gerald Vision (1998). Blindsight and Philosophy. Philosophical Psychology 11 (2):137-59.
    The evidence of blindsight is occasionally used to argue that we can see things, and thus have perceptual belief, without the distinctive visual awareness accompanying normal sight; thereby displacing phenomenality as a component of the concept of vision. I maintain that arguments to this end typically rely on misconceptions about blindsight and almost always ignore associated visual (or visuomotor) pathologies relevant to the lessons of such cases. More specifically, I conclude, first, that the phenomena very likely do not (...)
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  28.  40
    Iona Alexander & Alan Cowey (2010). Edges, Colour and Awareness in Blindsight. Consciousness and Cognition 19 (2):520-533.
    It remains unclear what is being processed in blindsight in response to faces, colours, shapes, and patterns. This was investigated in two hemianopes with chromatic and achromatic stimuli with sharp or shallow luminance or chromatic contrast boundaries or temporal onsets. Performance was excellent only when stimuli had sharp spatial boundaries. When discrimination between isoluminant coloured Gaussians was good it declined to chance levels if stimulus onset was slow. The ability to discriminate between instantaneously presented colours in the hemianopic field (...)
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  29.  21
    Robert W. Kentridge & Charles A. Heywood (1999). The Status of Blindsight: Near-Threshold Vision, Islands of Cortex and the Riddoch Phenomenon. Journal of Consciousness Studies 6 (5):3-11.
    In this introductory paper, we assess the current status of blindsight -- the phenomenon in which patients with damage to their primary visual cortex retain the ability to detect, discriminate and localize visual stimuli presented in areas of their visual field in which they report that they are subjectively blind. Blindsight has garnered a great deal of interest and critical research, in part because of its important implications for the philosophy of mind. We briefly consider why this is (...)
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  30.  17
    Charles A. Heywood, Robert W. Kentridge & Alan Cowey (1998). Cortical Color Blindness is Not ''Blindsight for Color''. Consciousness and Cognition 7 (3):410-423.
    Cortical color blindness, or cerebral achromatopsia, has been likened by some authors to ''blindsight'' for color or an instance of ''covert'' processing of color. Recently, it has been shown that, although such patients are unable to identify or discriminate hue differences, they nevertheless show a striking ability to process wavelength differences, which can result in preserved sensitivity to chromatic contrast and motion in equiluminant displays. Moreover, visually evoked cortical potentials can still be elicited in response to chromatic stimuli. We (...)
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  31. Christopher Mole & Sean D. Kelly (2006). On the Demonstration of Blindsight in Monkeys. Mind and Language 21 (4):475-483.
    The work of Alan Cowey and Petra Stoerig is often taken to have shown that, following lesions analogous to those that cause blindsight in humans, there is blindsight in monkeys. The present paper reveals a problem in Cowey and Stoerig's case for blindsight in monkeys. The problem is that Cowey and Stoerig's results would only provide good evidence for blindsight if there is no difference between their two experimental paradigms with regard to the sorts of stimuli (...)
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  32.  12
    Doerthe Seifert, Christine Falter, Hans Strasburger & Mark A. Elliott (2010). Bandpass Characteristics of High-Frequency Sensitivity and Visual Experience in Blindsight. Consciousness and Cognition 19 (1):144-151.
    Patient RP suffers a unilateral right homonymous quadrant anopia but demonstrates better than chance discrimination for stimuli presented in the blind field at temporal frequencies between 33 and 47 Hz . Examination of her reports of visual experience during blind-field discrimination suggests a more complex picture in which experiences particular to correct discrimination are not found at low-mid-gamma frequencies, but are significantly more likely than average at a lower frequency at which blindsight is not observed. We believe that visual (...)
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  33.  99
    Jason Holt (1999). Blindsight in Debates About Qualia. Journal of Consciousness Studies 6 (5):54-71.
    Blindsight is a hot topic in philosophy, especially in discussions of consciousness. Here I critically examine various attempts to bring blindsight to bear on debates about qualia -- the raw constituents of consciousness. I argue that blindsight does not unequivocally support any particular theory of qualia. It does, however, vindicate the view that there are qualia, despite arguments -- most notably by Daniel Dennett -- to the contrary.
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  34. Peter Carruthers (2001). Who is Blind to Blindsight? Psyche 7 (4).
    This paper uses the explanation of blindsight generated by a two-systems theory of vision in order to set Siewert a dilemma. Either his blindsight examples are modelled on actual blindsight, in which case certain reductive theories of phenomenal consciousness will have no difficulty in accommodating them. Or they are intended to be purely imaginary, in which case they will have no force against a reductive naturalist.
     
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  35.  69
    L. M. Vaina (1995). Akinetopsia, Achromatopsia and Blindsight: Recent Studies on Perception Without Awareness. Synthese 105 (3):253-271.
    The neural substrate of early visual processing in the macaque is used as a framework to discuss recent progress towards a precise anatomical localization and understanding of the functional implications of the syndromes of blindsight, achromatopsia and akinetopsia in humans. This review is mainly concerned with how these syndromes support the principles of organization of the visual system into parallel pathways and the functional hierarchy of visual mechanisms.
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  36.  7
    Jason Holt (2003). Blindsight and the Nature of Consciousness. Broadview Press.
    Ever since its discovery nearly thirty years ago, the phenomenon of blindsight — vision without visual consciousness — has been the source of great controversy in the philosophy of mind, psychology, and the neurosciences. Despite the fact that blindsight is widely acknowledged to be a critical test-case for theories of mind, Blindsight and the Nature of Consciousness is the first extended treatment of the phenomenon from a philosophical perspective. Holt argues, against much received wisdom, for a thorough-going (...)
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  37.  3
    Carlo A. Marzi (1999). Why is Blindsight Blind? Journal of Consciousness Studies 6 (5):12-18.
    It is proposed that there are at least two categories of blindsight. One is present in visually guided behaviour in normals as well as in brain-damaged patients, while the other is present only following cortical lesions. It is also proposed that blindsight is blind because residual visual functions are banned from consciousness either when they are subserved by subcortical centres alone or when they are mediated by cortical areas that have never been exclusively associated with such functions before (...)
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  38.  10
    J. D. Tapp (1997). Blindsight in Hindsight. Consciousness and Cognition 6 (1):67-74.
    Philosophers concerned with issues of mind have been turning to the neurosciences, especially neuropsychology, for empirical guidance. While I endorse this emphasis, I find that one important neuropsychological phenomenon, blindsight appears to have been misused by some prominent philosophers. In this paper, I examine this alleged misuse by spelling out the accounts of blindsight given by Daniel Dennett and Ned Block. I attempt to show that both Dennett and Block have ignored many complications surrounding blindsight including subjects' (...)
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  39.  1
    T. D. Tapp (1997). Blindsight in Hindsight. Consciousness and Cognition 6 (1):67-74.
    Philosophers concerned with issues of mind have been turning to the neurosciences, especially neuropsychology, for empirical guidance. While I endorse this emphasis, I find that one important neuropsychological phenomenon, blindsight appears to have been misused by some prominent philosophers. In this paper, I examine this alleged misuse by spelling out the accounts of blindsight given by Daniel Dennett and Ned Block. I attempt to show that both Dennett and Block have ignored many complications surrounding blindsight including subjects' (...)
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  40.  6
    K. Kranda (1998). Blindsight in the Blind Spot. Behavioral and Brain Sciences 21 (6):762-763.
    The filling-in process proposed as a cover up for the existence of the blind spot has some conceptual similarities to blindsight. The perceptual operation of a hypothetical mechanism responsible for filling in represents a logical paradox. The apparent indeterminacy of the percept in the optic-disc region can be tested experimentally by viewing the grating test pattern below.
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  41. Jason Holt (1999). Blindsight: An Essay in the Philosophy of Psychology and Mind. Dissertation, The University of Western Ontario (Canada)
    Although philosophers acknowledge the significance of blindsight for theories of mind---indeed, some try to trade on it---they have not given the phenomenon the extended treatment it deserves. In helping to fill this gap, I argue that despite attempts to use it in undermining qualia , blindsight supports realism about qualia, and an identity theoretic account of them. ;In Chapter 1 I argue against attempts by Dennett and the Churchlands to use blindsight in undermining qualia. I complement this (...)
     
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  42. Charles Siewert (2001). Spontaneous Blindsight and Immediate Availability: A Reply to Carruthers. Psyche 7.
    Carruthers' "immediate availability" theory of consciousness is criticized on the grounds that it offers no reasonable alternative to asserting the metaphysical impossibility of spontaneous blindsight. In defense, Carruthers says he can admit a spontaneous blindsight that relies on unconscious behavioral cues, and deny only its possibility without such mechanisms. I argue: This involves him in an unwarranted denial of the possibility that conscious visual discrimination could depend on behavioral cues. We can conceive of blindsight (...)
     
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  43.  59
    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.
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  44.  34
    Berit Brogaard (2015). Type 2 Blindsight and the Nature of Visual Experience. Consciousness and Cognition 32:92-103.
  45.  1
    Robert W. Kentridge (2015). What is It Like to Have Type-2 Blindsight? Drawing Inferences From Residual Function in Type-1 Blindsight. Consciousness and Cognition 32:41-44.
  46.  14
    Tarryn Balsdon & Paul Azzopardi (2015). Absolute and Relative Blindsight. Consciousness and Cognition 32:79-91.
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  47.  4
    Robert Foley (2015). The Case for Characterising Type-2 Blindsight as a Genuinely Visual Phenomenon. Consciousness and Cognition 32:56-67.
  48.  3
    Juha Silvanto (2015). Why is “Blindsight” Blind? A New Perspective on Primary Visual Cortex, Recurrent Activity and Visual Awareness. Consciousness and Cognition 32:15-32.
  49. Alessia Celeghin, Marissa Barabas, Francesca Mancini, Matteo Bendini, Emilio Pedrotti, Massimo Prior, Anna Cantagallo, Silvia Savazzi & Carlo A. Marzi (2015). Speeded Manual Responses to Unseen Visual Stimuli in Hemianopic Patients: What Kind of Blindsight? Consciousness and Cognition 32:6-14.
  50. David Milner (1998). Insights Into Blindsight. Trends in Cognitive Sciences 2 (7):237-238.
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