D S Smith

University of Sydney, Sydney, New South Wales, Australia

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Publications (5)9.4 Total impact

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    ABSTRACT: The aim of this study was to investigate a conventional battery of tests capable of assessing the presence of the component and extent of the lesions in patients with unilateral spatial neglect. Ninety-four patients who had unilateral spatial neglect with a stroke in right hemisphere were assessed on 12 traditional neglect batteries 4 weeks after the onset. Computerized tomography was also performed to investigate the possible anatomical relationships with each neglect battery. Factor analysis showed that the tests loaded significantly on five factors. There are not only visual scanning factors but also factors of imaging, visual judgement, visual cognition and effectiveness from left hemisphere in the unilateral spatial neglect. There are high correlations between each neuropsychological test and neglect batteries. Furthermore, lesions in the paraventricular white matter were associated with clock and person drawing tasks. Lesions in the occipital lobe were associated with reading, explaining and visual counting tasks. Lesions in the temporal lobe and the posterior limb of the internal capsule were associated with line bisection tasks. It is suggested that it is possible that there are some different components in unilateral spatial neglect. Failure in some tasks may predict different lesions in terms which include localization.
    Brain Injury 03/2001; 15(2):125-37. · 1.51 Impact Factor
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    ABSTRACT: In this study, we examined twenty-five patients with left putaminal haemorrhage to investigate the relations between ideational apraxia (IA) and intracerebral haemorrhage. Apraxias were determined at 1 and 6 months after the stroke onset. Extension and volume of haematoma were examined with CT scan within 2 days of stroke onset. IA was present in 10 cases at 1 month and disappeared in 6 cases (transient IA) and persisted in 4 cases(persisted IA) at 6 months from the onset. Although the haematoma volume related to the existence of IA, there was no significant difference between transient and persistent IA. All three patients with the haematoma volume larger than 40 ml in the transient IA group were younger than 50 years old. All cases with persistent IA were older than 50 years old. Consequently, the existence of IA seems to be partially dependent on the haematoma volume which may cause the organic damage of subcortical white matter. However, patient's age is also important to determine the prognosis of IA. This maybe related to the nature of the haemorrhage and the mode of the onset. These factors remain to be determined.
    Journal of Clinical Neuroscience 08/2000; 7(4):309-11. · 1.25 Impact Factor
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    ABSTRACT: We examined 33 patients with left intracerebral haemorrhage to investigate the relations to buccofacial apraxia (BFA). BFA was present in 18 cases at 1 month and disappeared in 3 cases and persisted in 15 cases at 6 month from the onset. The existence of BFA seems to be partially dependent the haematoma volume which may cause the organic damage in lenticulate nucleus, insula, posterior limb or internal capsule and anterior portion of paraventricle white matter. All patients with BFA had aphasia (Broca 6, Wernicke 1, Total 10, Amnestic 1). Aphasia of the patients with transient BFA improved as well as the patients without BFA after BFA disappeared. We suspected that improvement or aphasia might be affected by BFA.
    Brain Injury 12/1997; 11(11):777-82. · 1.51 Impact Factor
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    ABSTRACT: Twenty-two patients with thalamic haemorrhage were examined to investigate the relationship between motor and cognitive function, and activities of daily living (ADL). Patients with unilateral spatial neglect had lower ADL scores on admission than patients without unilateral spatial neglect (Mean: 17.0 and 24.6, respectively; F = 4.38, df = 1, p < 0.05). Unilateral spatial neglect related to feeding, bowel control and transfer in Barthel index on admission. Patients with aphasia on admission had lower ADL at discharge than patients without aphasia on admission (Mean: 57.0 and 84.7, respectively; F = 7.70, df = 1, p < 0.05). Aphasia related to the bathing, toilet, stair climbing, dressing, and ambulation in Barthel index on discharge. There was a significant difference between the severity of paresis in upper and lower limb on admission and ADL at discharge. The two-way repeated measures ANOVA showed a significant difference between severity of paresis in lower limb and ADL improvement. It can be suggested that the most important predictor of outcome was paresis in lower limb, and not aphasia or unilateral spatial neglect.
    Disability and Rehabilitation 11/1997; 19(11):459-64. · 1.54 Impact Factor
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    ABSTRACT: The aim of this study is to report the preliminary findings of a traditional battery of tests and our original battery capable of assessing the presence of components and extent of lesions in patients with unilateral spatial neglect. Thirty patients who had unilateral spatial neglect with a stroke in the right hemisphere were assessed for unilateral spatial neglect on exploratory-motor (E-M) tasks, visual-counting (V-C) tasks, and traditional neglect batteries at least 4 weeks after the onset. Other neuropsychological tests and computed tomography were also performed to investigate the relationship with neglect. A factor analysis showed that our tasks loaded significantly on three factors. E-M neglect was found in 16 patients, and V-C neglect in 22 patients with unilateral spatial neglect. There were high correlations between E-M neglect and motor paralysis, word fluency, backward digit span and motor impersistence. There were high correlations between V-C neglect and visual-field defect, line bisection, line cancellation and figure copying. Lesions in the frontal lobe, caudate, insula, and anterior portion of the paraventricular white matter were commonly associated with E-M neglect. Lesions in the occipital lobe were also associated with V-C neglect. We suggest that unilateral neglect is not a single phenomenon, but rather involves several different components. We propose that E-M and V-C tasks are useful methods for evaluating the extent of lesions in patients with unilateral spatial neglect.
    Journal of Neurology 08/1997; 244(7):412-7. · 3.58 Impact Factor

Publication Stats

19 Citations
9.40 Total Impact Points

Institutions

  • 1997–2001
    • University of Sydney
      Sydney, New South Wales, Australia
  • 1997–2000
    • Royal Rehabilitation Centre Sydney
      Sydney, New South Wales, Australia