Unilateral Spatial Neglect and Impairments of Spatial Analysis and Visual Perception

Oxbury, J. M.; Campbell, Daniel; Oxbury, Susan

doi:10.1093/brain/97.1.551

Cited by 98 publications

(28 citation statements)

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“…Levine et al (1986), found the rate and extent of improvement depended on the integrity of the remaining areas in both cerebral hemispheres. Neglect of the right side of visual space is less commonly reported, Oxbury, Campbell and Oxbury (1974) found that seven of the 17 left hemiplegic stroke patients (41%) were classified as having left visual spatial neglect. In contrast none of the 15 right hemiplegic stroke patients showed evidence of neglect.…”

Section: Frequency Of Unilateral Neglectmentioning

confidence: 99%

“…Oxbury et al, (1974) assessed neglect by asking patients to copy line drawings freehand with diagnosis of neglect being based on failure to complete either the left or the right hand side of anyone of these four drawings. Patients also had to describe items in a picture and in an array in front of them, read, write and bisect lines.…”

Section: Frequency Of Unilateral Neglectmentioning

confidence: 99%

“…Campbell and Oxbury (1976) assessed 141eft hemiplegic stroke patients who had been assessed at three to four weeks, from a previous study (Oxbury et al, 1974), six months after onset of the stroke. The patients were aged less than 65 years and were reassessed on drawings as previously mentioned and on tests of spatial analysis and visual perception.…”

Section: Frequency Later Post Strokementioning

confidence: 99%

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A comparison of two approaches in the treatment of perceptual problems after stroke

Edmans¹,

Webster

Lincoln

2000

Clin Rehabil

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Section: Frequency Of Unilateral Neglectmentioning

confidence: 99%

Section: Frequency Of Unilateral Neglectmentioning

confidence: 99%

Section: Frequency Later Post Strokementioning

confidence: 99%

See 1 more Smart Citation

A comparison of two approaches in the treatment of perceptual problems after stroke

Edmans¹,

Webster

Lincoln

2000

Clin Rehabil

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“…Some can no longer perform reversible operations in visual space, or assume in imagination dilTering properties of objects or drawings, and show constructional and dressing apraxias (Hecaen 1962, Butlers & Barton 1970, Butters et al 1970. A common and most striking sign is a profound neglect of and inattention to the contralateral half of the body and of external space (Patlerson & ZangwilI 1944, Oxbury et al 1974, more frequently after lesions of the right than the left hemisphere in right-handed individuals (Hecaen et al 1964). Such lesions may also lead to loss of the topographical sense (Brain 1941, Semmes et al 1955, 1963, and to perceptual rivalry.…”

Section: Experimental Approachmentioning

confidence: 99%

Brain Mechanisms for Directed Attention

Mountcastle

1978

J R Soc Med

235

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In his inaugural address of this series in 1957, Lord Adrian (Adrian 1957) elucidated the general conceptual approach used by Sherrington in his analysis of the function of the nervous system, and showed how in his long and productive scientific career Sherrington established the science of neurophysiology as we know it in the English-speaking world. Later lecturers (Denny-Brown 1962, Granit 1968, Whitteridge 1972 have illustrated through their own discoveries the continuing influence of Sherrington's ideas upon contemporary neuroscience. You will see from that which follows that I have taken a somewhat different approach in my research of recent years (Mountcastle et 0/. 1975, Mountcastle 1976, Lynch et 01. 1977. Nevertheless, I like to believe that Sherrington would have found something of interest in it.The experiments I shall describe have their conceptual origin in part in the studies of parietal lobe function in humans, particularly those studies of Holmes (1918Holmes ( , 1936, Critchley (1953) and Denny-Brown & Chambers (1958), and those of similarly perceptive neurologists who have followed them. Their clinical studies have led to the proposition that the parietal lobe of the cerebrum, together with its system connections, contains a neural apparatus which generates an internal neural image of the body position within the immediately surrounding behavioural space and the gravitational field, of the spatial relation between the body parts, of the direction of gaze and of visual attention, and of dynamic changes in these postural and attitudinal sets.It is the major theme of my lecture that this parietal lobe mechanism also receives signals concerning the internal state of the organism in terms of needs and interests, and from time to time generates commands for action, for selective and directed visual attention into the immediate behavioural surround, for the visual grasping of objects, and for skilled coordinated actions of hand and eye. On the afferent side this apparatus appears to be linked to the 'second' visual system, that which projects via the superior colliculus and pretectum to the dorsal thalamus and the parietal lobe, as well as to a relayed and convergent input from the geniculostriate system via the dorsal thalamus. This command apparatus of the parietal lobe appears to function less automatically than do more familiar ones linking input to output directly. It is conditional in nature, and depends for action upon the outcome of a matching function between the neural signals of the nature of objects -quality, location, novelty -and those of central drive states. AttentionThe human observer possesses a limited information processing capacity, yet he is immersed in a sea of signals which possess important implications and consequences for him -guides for.

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“…Patients were told they would hear a sound and then either be touched by a hair or not, which they should report as "yes" or "no". Testing comprised a.random series of blocks, within each of which the same von Frey hair was used for 10 stimuli randomly interspersed with 10 About 10% of the tactile stimuli were not identified independent of the stimulus strength. This accords with earlier observations,2 3 and explains the superficial similarity to hysteria.…”

Section: Methodsmentioning

confidence: 99%

Tactile sensibility in parietal lesions.

Tegnér

1989

Journal of Neurology, Neurosurgery & Psychiatry

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SUMMARY The response to tactile stimuli at the threshold range was studied with a forced choice technique in two patients with stable parietal lesions. The most unexpected finding was that very weak stimuli were significantly better detected on the side contralateral to the lesion. The psychometric functions were also less steep and reached a ceiling at below 100% correct responses. The findings are interpreted as due to the combined effect of decreased sensitivity to alterations in stimulus strength and decreased local attention.According to classical doctrines, lesions of the parietal lobe cause little impairment of simple sensory modalities but mainly affects discriminative sensory functions.'`3 Tactile stimuli at the normal threshold level can be felt but the responses are irregular: "When graded tactile stimuli are applied it is found that the proportion of correct responses is not directly related to their intensity, but naturally the proportion increases as the strength of the stimulus is increased."' Due to the variability, this impairment is often attributed to hysteria.5 In the present study, tactile sensibility was examined in two patients with stationary parietal lesions. A modern psychophysical method was used that identifies changes in the patients' response criterion.67 PatientsThe study was of two men, 42 and 73 years of age, who both had sustained infarctions ofthe right parietal lobe. They were selected for more detailed examination since they had normal tactile thresholds as measured with von Frey hairs according to the method of limits' but still failed to detect a few stimuli that appeared to be clearly suprathreshold. The latter finding is somewhat similar to what is seen in hysterical patients.Diagnoses were substantiated by CT. They were examined 6 and 3 years after stroke, respectively. Postural sensibility and stereognosis were markedly impaired in the left hand. Vibratory sensibility was normal. The younger patient spontaneously described touch with a piece of cotton wool and light pin prick as less distinct on the left side. MethodsTo test for light touch calibrated von Frey hairs were used.

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Unilateral Spatial Neglect and Impairments of Spatial Analysis and Visual Perception

Cited by 98 publications

References 0 publications

A comparison of two approaches in the treatment of perceptual problems after stroke

A comparison of two approaches in the treatment of perceptual problems after stroke

Brain Mechanisms for Directed Attention

Tactile sensibility in parietal lesions.

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