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The "Landmark Task" is designed to tease apart two major factors in determining line bisection errors in spatial neglect: one whose general nature is perceptual, the other whose nature is motor. On critical test trials, the subject is required to point to whichever end of a mid-transected line is judged as nearer to the transection. Seven out of eight(More)
The rightward line bisection errors made by patients with visuospatial neglect can be explained as due to a spatially misdirected response, which would be predicted on either of two accounts. An alternative view, however, is that such patients actually misperceive the left half of a horizontal line as being shorter than the right half. We have tested this(More)
When asked to compare two lateralized shapes for horizontal size, neglect patients often indicate the left stimulus to be smaller. Gainotti and Tiacci (1971) hypothesized that this phenomenon might be related to a rightward bias in the patients' gaze. This study aimed to assess the relation between this size underestimation and oculomotor asymmetries. Eye(More)
BACKGROUND Cerebral cavernous malformations (CCMs) are prone to bleeding but the risk of intracranial haemorrhage and focal neurological deficits, and the factors that might predict their occurrence, are unclear. We aimed to quantify these risks and investigate whether they are affected by sex and CCM location. METHODS We undertook a population-based(More)
BACKGROUND The decision about whether to treat an unruptured brain arteriovenous malformation (AVM) depends on a comparison of the estimated lifetime risk of intracranial haemorrhage with the risks of interventional treatment. We aimed to test whether outcome differs between adults who had interventional AVM treatment and those who did not. METHODS All(More)
BACKGROUND AND PURPOSE The rarity of intracranial vascular malformations (IVMs) and the infrequency of their outcomes make large, prolonged cohort studies the best means to evaluate their frequency and prognosis. METHODS The Scottish Intracranial Vascular Malformation Study (SIVMS) is a prototype prospective, population-based study of adults resident in(More)
Groups of patients with left or right unilateral cerebral stroke were tested for their ability to reach either toward a single visual target or midway between 2 targets. The tasks were performed both in free vision and in conditions preventing visual feedback from the hand. It was found that only the right CVA patients were inaccurate in reaching, and only(More)
Right hemisphere damaged patients with and without left visual neglect, and age-matched controls had objects of various sizes presented within left or right body hemispace. Subjects were asked to estimate the objects' sizes or to reach out and grasp them, in order to assess visual size processing in perceptual-experiential and action-based contexts(More)
Recent studies have shown that certain symptoms of spatial neglect are co-determined by two major factors: one whose general nature is perceptual, the other whose nature is directional and/or motor. In the present study, patients whose neglect was classified as predominantly 'perceptual' or 'directional' through use of the Landmark task (Milner, Brechmann(More)
BACKGROUND AND PURPOSE The extent of variation in the interventional treatment of brain arteriovenous malformations (AVMs) is unknown, so we explored patterns of treatment at 4 neuroscience centers in one European country. METHODS We included every participant with an AVM in a prospective, population-based cohort study of adults aged >or=16 years residing(More)