Current controversiesThe modular architecture of the neglect syndrome: Implications for action control in visual neglect
Section snippets
Acknowledgement
This work is supported by The Wellcome Trust.
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Anatomy and disorders of the spatial attention systems
2021, Encyclopedia of Behavioral Neuroscience: Second EditionVisual and motor neglect: Clinical and neurocognitive aspects
2021, Revue NeurologiqueCitation Excerpt :Given the strong influence of spatial position on neglect signs, it is important to carefully center the test sheets on the patient's midsagittal plane. Not all patients consistently show neglect on all these tests, consistent with the probable multi-component nature of this syndrome [36,37], with different patterns of deficits occurring in different patients [38,39]. To achieve good diagnostic sensitivity, it is thus important to have patients perform several visuospatial tests.
Component deficits of visual neglect: “Magnetic” attraction of attention vs. impaired spatial working memory
2018, NeuropsychologiaCitation Excerpt :When asked to cross out targets scattered on a sheet, neglect patients typically restrict their exploration to the right part of the sheet and omit cancelling left-sided targets (Albert, 1973). The precise mechanisms leading to neglect behavior are object of debate since almost a century, but some consensus is now emerging that distinct component deficits of neglect may variously dissociate in some patients (Barbieri and De Renzi, 1989; Binder et al., 1992; Charras et al., 2012; Heilman et al., 2002; Mesulam, 1985, 2000; Vallar, 1998), or combine and interact in others (Bartolomeo, 2007; Coulthard et al., 2007; Gainotti et al., 1991; Karnath, 1988). As a consequence, the focus of research is now shifting to the identification of these component deficits, to the study of their modes of interactions and the exploration of their anatomical bases.
Visuospatial neglect in action
2012, NeuropsychologiaCitation Excerpt :Karnath et al. (1997) suggested that the deviations of pointing movements towards the ipsilesional side, sometimes observed in neglect patients (e.g., Goodale et al., 1990), seem characteristic of patients with optic ataxia. Clinically neglect and optic ataxia are clearly distinguishable (although they may co-occur; Coulthard, Parton, & Husain, 2007): neglect is diagnosed based on rightward biases in paper and pencil tests (e.g., visual search, copying and line bisection) whereas optic ataxia patients show deficits in reaching towards peripheral locations with no deficits in peripersonal space exploration tasks (Coulthard, Parton, & Husain, 2007; Himmelbach et al., 2007; Perenin, 1997). So what is the relationship between the lesions of patients with optic ataxia and the visuomotor deficits found in neglect patients?
Impaired delayed but preserved immediate grasping in a neglect patient with parieto-occipital lesions
2011, NeuropsychologiaCitation Excerpt :Patients with neglect typically present with loss of awareness in the contralesional side of space and their lesions most frequently overlap in the inferior parietal lobe (Mort et al., 2003) and/or superior temporal gyrus (Karnath, Berger, Küker, & Rorden, 2004). Although it has been suggested that such patients exhibit visuomotor deficits (Coulthard, Parton, & Husain, 2006) the impact of neglect on action tasks has been a hotly debated topic in the last decade (Coulthard Parton, & Husain, 2007; Himmelbach, Karnath, & Perenin, 2007). Very briefly, while some authors argue that lesions in the inferior parietal role lead to motor impairments in neglect patients (Mattingley, Husain, Rorden, Kennard, & Driver, 1998), others argue that even severe neglect patients in the acute stage of their stroke can accurately reach to a target presented in their neglected field (e.g., Himmelbach & Karnath, 2003).
The neural basis of visuomotor deficits in hemispatial neglect
2009, Neuropsychologia