Visual Capacity in the Hemianopic Field Following a Restricted Occipital Ablation

Weiskrantz, Lawrence; Warrington, Elizabeth K.; Sanders, M. D.; Marshall, John C.

doi:10.1093/brain/97.1.709

Cited by 1,356 publications

(633 citation statements)

References 17 publications

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“…This would be problematic to the current claim that the attentional blink affects spatial processing. After all, if observers simply do not perceive a cue, then it is not surprising that they do not know its location either (unless one attributes some sort of blindsight to them; see, e.g., Weiskrantz, Warrington, Sanders, & Marshall, 1974). In the extreme, it is possible that, despite the arguments for a late (memory) locus of the attentional blink, on some trials the cues are not processed at all-even at a perceptual level.…”

Section: Experiments 4: Eliminating An Unawareness Accountmentioning

confidence: 99%

Spatiotemporal Segregation in Visual Search: Evidence From Parietal Lesions.

Olivers

Humphreys²

2004

Journal of Experimental Psychology: Human Perception and Perfor

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The detection or discrimination of the second of 2 targets in a rapid serial visual presentation (RSVP) task is often temporarily impaired-a phenomenon termed the attentional blink. This study demonstrated that the attentional blink also affects localization performance. Spatial cues pointed out the possible target positions in a subsequent visual search display. When cues were presented inside an attentional blink (as induced by an RSVP task), the observers' capacity to use them was reduced. This effect was not due to attention being highly focused, to general task switching costs, or to complete unawareness of the cues. Instead, the blink induced a systematic localization bias toward the fovea, reflecting what appears to be spatial compression.

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Section: Experiments 4: Eliminating An Unawareness Accountmentioning

confidence: 99%

Spatiotemporal Segregation in Visual Search: Evidence From Parietal Lesions.

Olivers

Humphreys²

2004

Journal of Experimental Psychology: Human Perception and Perfor

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“…Weiskrantz, 2002;de Gelder, Tamietto, Pegna, & Van den Stock, 2014;de Gelder, Vroomen, Pourtois, & Weiskrantz, 1999;Hamm et al, 2003;Heywood & Kentridge, 2000;Morris, DeGelder, Weiskrantz, & Dolan, 2001;Pegna, Khateb, Lazeyras, & Seghier, 2005;Rossion, de Gelder, Pourtois, Guerit, & Weiskrantz, 2000;Tamietto & de Gelder, 2008;Tamietto, Pullens, de Gelder, Weiskrantz, & Goebel, 2012;Tamietto et al, 2009;Van den Stock et al, 2011). As is the case for the original phenomenon of ''blindsight'' (Pöppel, Held, & Frost, 1973;Weiskrantz, Warrington, Sanders, & Marshall, 1974), the ''blind'' component in affective blindsight refers to the patients' statement of not seeing or consciously perceiving the emotional stimuli, while the ''sight'' component reflects their residual ability to respond, discriminate or display spontaneous expressive and physiological responses that are appropriate to the specific emotional content of the visual signals they are presented with.…”

Section: Introductionmentioning

confidence: 99%

From affective blindsight to emotional consciousness

Celeghin

Gelder

Tamietto

2015

Consciousness and Cognition

113

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a b s t r a c tFollowing destruction or denervation of the primary visual cortex (V1) cortical blindness ensues. Affective blindsight refers to the uncanny ability of such patients to respond correctly, or above chance level, to visual emotional expressions presented to their blind fields. Fifteen years after its original discovery, affective blindsight still fascinates neuroscientists and philosophers alike, as it offers a unique window on the vestigial properties of our visual system that, though present in the intact brain, tend to be unnoticed or even actively inhibited by conscious processes. Here we review available studies on affective blindsight with the intent to clarify its functional properties, neural bases and theoretical implications. Evidence converges on the role of subcortical structures of old evolutionary origin such as the superior colliculus, the pulvinar and the amygdala in mediating affective blindsight and nonconscious perception of emotions. We conclude that approaching consciousness, and its absence, from the vantage point of emotion processing may uncover important relations between the two phenomena, as consciousness may have evolved as an evolutionary specialization to interact with others and become aware of their social and emotional expressions.

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Section: Introductionmentioning

confidence: 99%

“…In spite of this, cortically blind patients often show above-chance performance detecting, discriminating or localizing stimuli presented in their blind field (Pöppel, Frost, & Held, 1973;Weiskrantz, Warrington, Sanders, & Marshall, 1974). Referred to as 'blindsight' (Weiskrantz et al, 1974) a special sensitivity to transient, as compared with static stimuli has been described in the literature since the first studies of residual visual capability following induced blindness. Described in terms of a stato-kinetic dissociation (Riddoch, 1917) it is suggested that sensitivity to transient stimuli is brought about by a particular temporal visual channel transmitting kinetic as opposed to static visual information (Schiller et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Bandpass characteristics of high-frequency sensitivity and visual experience in blindsight

Seifert

Falter

Strasburger

et al. 2010

Consciousness and Cognition

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a b s t r a c tPatient 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 (all significant at p < .05, binomial). 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 (76%, p < .001) at a lower frequency (22 Hz) at which blindsight is not observed. We believe that visual experience may serve to support blindsight if discrimination tasks are generally impaired at frequencies outside of the low-mid-gamma band. If this is so, although generally experienced as non-specific and unstructured light, the visual experience that accompanies discrimination performance must be based upon a neural representation which includes information on the visual features present in the stimulus.

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Visual Capacity in the Hemianopic Field Following a Restricted Occipital Ablation

Cited by 1,356 publications

References 17 publications

Spatiotemporal Segregation in Visual Search: Evidence From Parietal Lesions.

Spatiotemporal Segregation in Visual Search: Evidence From Parietal Lesions.

From affective blindsight to emotional consciousness

Bandpass characteristics of high-frequency sensitivity and visual experience in blindsight

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