Corbettas dan and van what is neglect definition

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Unformatted text preview: for attention !  e.g.,- Cannot process information in area V1 !  Selects what information should access the limited processing resources 43 Overview Behavioral consequences of attention Selective attention and orienting Attention and eye movements Physiological effects of attention How is attention directed? Corbetta's DAN and VAN What is neglect? ! Definition, anatomy, symptoms ! Neglect and attention ! Neglect and spatial functions ! Body schema and awareness ! ! ! ! ! ! ! 44 ial neglect rather than with brain damage per se. (Modified from Becker & Karnath, 2010). (c) Scan paths (=gaze [combined eye and head orie ents with spatial neglect (upper panel) during active visual search (black lines) as well as at rest (gray lines) as compared with a group of 1 lect (lower panel). The neglect patients show a marked bias of their active and their passive behavior toward the ipsilesional, right side (Modi hannsen, & Karnath, 2008). What is spatial neglect? re unaware of their shifted spatial egocenter and efault position. Despite variations in performance s, this spontaneous behavior appears remarkably uggests that there is a unitary, homogenous core define as “spatial neglect” (illustrated in Fig. 1). inical observations are a consequence of this core rient toward the right whenever addressed (even the left), and ignore contralesionally located peoreover, when they actively search for targets they r exploratory eye and hand movements toward space (Behrmann, Watt, Black, & Barton, 1997; , Valenstein, & Damasio, 1983; Karnath, 1994b). are precisely documented by recordings of these 1c; Karnath & Perenin, 1998; Karnath, Niemeier, 8) and are reliably measured by popular clinical ying or cancellation tasks (where individuals are numerous targets in a cluttered array) (Rorden & et al., 2011). These cortical areas also are involved in the left hemisphere when patients show spatial neglect afte hemisphere stroke (Suchan & Karnath, 2011). Findings from tract tracing, myelin staining, and dif tensor imaging techniques suggest a dense perisylvian n interconnecting these three cortical sites (Fig. 2; Karnath, the inferior parietal lobule with the lateral prefrontal cort subcomponents II/III of the superior longitudinal fascicul II/III] and the superior occipitofrontal fascicle [SOF]), later frontal cortex with superior/middle temporal cortex (via fasciculus [AF] and extreme capsule/inferior occipitofronta culus [EmC/IOF]), and superior temporal cortex with the parietal lobu...
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