Non-spatial extinction following lesions of the parietal lobe in humans

@article{Humphreys1994NonspatialEF,
  title={Non-spatial extinction following lesions of the parietal lobe in humans},
  author={G. Humphreys and C. Romani and A. Olson and M. Riddoch and J. Duncan},
  journal={Nature},
  year={1994},
  volume={372},
  pages={357-359}
}
EFFICIENT behaviour in the visual environment requires selection between stimuli competing for control of action. Many current models of selection are spatial: relevant objects are chosen by attending to their locations1–3. The unilateral stimulus extinction observed following lesions of the parietal lobe provides evidence for spatial selection4. Such patients may identify a single stimulus presented in their contralesional field, but can fail to detect the same stimulus when a competing… Expand
Competition between simultaneous stimuli modulated by location probability in hemispatial neglect
TLDR
The results showed that the spatial bias facilitated detection of all left-sided targets in the neglect group, but was more spatially specific in the control group, which underscores the competitive push-pull relationship between different bottom-up and top-down attentional factors, particularly within neglect patients, in whom a strong ipsilesional attentional bias already exists. Expand
Attention as the ‘glue’ for object integration in parietal extinction
TLDR
Comparisons with objects that varied in their dominant direction of grouping indicate that grouping can overcome visual extinction only when object integration departs from the attended visual field, implying, contrary to many previous accounts, that attention is crucial for grouping to be initiated. Expand
Spatial extinction on double asynchronous stimulation
TLDR
It is suggested that a competitive model of visual selective attention fits the data quite well and appears to contradict the disengagement hypothesis, which predicted a substantial reduction of extinction when a stimulus was displayed first into the lesioned side of space. Expand
Expectation-based attentional modulation of visual extinction in spatial neglect
TLDR
Competition for selection between visual stimuli may not only be influenced by perceptual characteristics of the display, but also by high-level factors such as the response criterion or expectation biases. Expand
Impaired visual sensitivity within the ipsilesional hemifield following parietal lobe damage
TLDR
Visual sensitivity is examined in two patients with spatial neglect and extinction arising primarily from left-parietal damage to indicate that parietal cortex damage can influence visual perception within both the ipsi- as well as the contralesional field. Expand
Visual extinction and cortical connectivity in human vision.
TLDR
It is shown here that pair detection is improved in conditions where the two stimuli presented to the two halves of the visual field are proximal, co-oriented and co-axial, and it is further shown that stimulus properties producing reduced extinction correlate with the selectivity pattern of spatial lateral interactions observed in the primary visual cortex. Expand
Extinction: a window into attentional competition.
TLDR
Evidence indicates that the disorder of extinction plays an important role in the understanding of attentional selection and some of the factors that contribute to the recovery from extinction are discussed, and their implications for functional and neural theories of selection are considered. Expand
Transient binding by time: Neuropsychological evidence from anti-extinction
TLDR
A series of experiments that examine the factors that lead to anti-extinction in a patient GK, who has bilateral parietal lesions but more impaired identification of left-side stimuli, interpret the data as indicating that there is unconscious and transient temporal binding in vision. Expand
Contrast dependence of perceptual grouping in brain-damaged patients with visual extinction.
TLDR
The present demonstration of contrast dependency in such processing, strengthens the previous conjecture that even in the presence of significant, extinction producing, parietal damage, the primary visual cortex preserves the capacity to encode, using long-range lateral interactions, an image description in which visual objects are already segregated from background. Expand
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TLDR
It is demonstrated that surface information can substantially reduce extinction, whereas contour completions showed comparably smaller influences. Expand
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