Different patterns of dissociation in unilateral spatial neglect

The aim of this paper is to discuss the issue of dissociations found in unilateral spatial neglect according to the modality of space exploration and the nature of the task. For this purpose we present a reanalysis of the data from a recent paper of Gentilini et al. (1989) comparing visual and blindfolded exploration of a computer keyboard and discuss the performance of a left-brain-damaged patient with right visuospatial neglect and left-sided neglect dyslexia. We conclude that unilateral spatial neglect cannot be interpreted as a disruption of a single attentional mechanism, but rather it reflects impaired attentional mechanisms at several levels of cognitive processing.

[1]  James L. McClelland,et al.  An interactive activation model of context effects in letter perception: I. An account of basic findings. , 1981 .

[2]  H. Spinnler,et al.  The performance of brain-damaged patients in spatial localization of visual and tactile stimuli. , 1971, Brain : a journal of neurology.

[3]  E. Bisiach,et al.  Disorders of perceived auditory lateralization after lesions of the right hemisphere. , 1984, Brain : a journal of neurology.

[4]  F. Chédru.  Space representation in unilateral spatial neglect. , 1976, Journal of neurology, neurosurgery, and psychiatry.

[5]  M. Sidman,et al.  Some determinants of visual neglect. , 1969, Journal of neurology, neurosurgery, and psychiatry.

[6]  K M Heilman,et al.  Directional hypokinesia and hemispatial inattention in neglect. , 1990, Brain : a journal of neurology.

[7]  J. Bradshaw,et al.  Vibrotactile reaction times in unilateral neglect. The effects of hand location, rehabilitation and eyes open/closed. , 1988, Brain : a journal of neurology.

[8]  Costanza Papagno,et al.  Unawareness of disease following lesions of the right hemisphere: Anosognosia for hemiplegia and anosognosia for hemianopia , 1986, Neuropsychologia.

[9]  M. Posner,et al.  How do the parietal lobes direct covert attention? , 1987, Neuropsychologia.

[10]  E. Capitani,et al.  Influence of rehabilitation on language skills in aphasic patients. A controlled study. , 1979, Archives of neurology.

[11]  M. Posner,et al.  Cueing Spatial Attention during Processing of Words and Letter Strings in Normals. Technical Report #2. , 1986 .

[12]  Glyn W. Humphreys,et al.  The effect of cueing on unilateral neglect , 1983, Neuropsychologia.

[13]  Edoardo Bisiach,et al.  Line bisection and cognitive plasticity of unilateral neglect of space , 1983, Brain and Cognition.

[14]  Giuseppe Vallar,et al.  The Anatomy of Spatial Neglect in Humans , 1987 .

[15]  K M Heilman,et al.  Performance On hemispatial pointing task by patients with neglect syndrome , 1983, Neurology.

[16]  F. J. Friedrich,et al.  Effects of parietal injury on covert orienting of attention , 1984, The Journal of neuroscience : the official journal of the Society for Neuroscience.

[17]  Alfonso Caramazza,et al.  Spatial representation of words in the brain implied by studies of a unilateral neglect patient , 1990, Nature.

[18]  M. B. Bender,et al.  Unilateral spatial agnosia (inattention) in patients with cerebral lesions. , 1956, Brain : a journal of neurology.

[19]  E. Bisiach,et al.  Two basic properties of space representation in the brain: evidence from unilateral neglect. , 1985, Journal of neurology, neurosurgery, and psychiatry.

[20]  G. Ettlinger,et al.  Unilateral spatial neglect and defective performance in one half of space. , 1985, The International journal of neuroscience.

[21]  F. Chain,et al.  [Visual negligence in posterior lesions of the left hemisphere (author's transl)]. , 1979, Revue neurologique.

[22]  G. Gainotti.  Les Manifestations De Negligence et D'inattention Pour L'hemispace , 1968 .

[23]  B. Caplan.  Stimulus Effects in Unilateral Neglect? , 1985, Cortex.

[24]  A. Caramazza,et al.  The Graphemic Buffer and attentional mechanisms , 1989, Brain and Language.

[25]  Kenneth M. Heilman,et al.  Directional hypokinesia , 1985, Neurology.

[26]  F. Michèl,et al.  Verbal visual extinction in right/left hemisphere lesion patients and the problem of lexical access , 1987, Neuropsychologia.

[27]  M. Kinsbourne,et al.  A model for the mechanism of unilateral neglect of space. , 1970, Transactions of the American Neurological Association.

[28]  A Hoffer,et al.  Letter: The megavitamin scene. , 1974, Lancet.

[29]  J. Marshall,et al.  VISUOSPATIAL NEGLECT: UNDERLYING FACTORS AND TEST SENSITIVITY , 1989, The Lancet.

[30]  E K Warrington,et al.  The dissociation of visuospatial neglect and neglect dyslexia. , 1987, Journal of neurology, neurosurgery, and psychiatry.

[31]  E. Renzi,et al.  Space Exploration with and without the Aid of Vision in Hemisphere-Damaged Patients , 1989, Cortex.

[32]  K M Heilman,et al.  Selective attention in hemispatial neglect. , 1989, Archives of neurology.

[33]  James L. McClelland,et al.  An interactive activation model of context effects in letter perception: part 1.: an account of basic findings , 1988 .

[34]  E. Renzi,et al.  Patterns of neglect dissociation. , 1989, Behavioural neurology.

[35]  M. Albert.  A simple test of visual neglect , 1973, Neurology.

[36]  E. Bay.  Disturbances of visual perception and their examination. , 1953, Brain : a journal of neurology.

[37]  Roberto Cubelli,et al.  Selective spatial attention and length representation in normal subjects and in patients with unilateral spatial neglect , 1989, Brain and Cognition.

[38]  E. Renzi,et al.  The Occurrence of Visual Neglect in Patients With Unilateral Cerebral Disease , 1976, Cortex.

[39]  G. Rizzolatti,et al.  Neural Circuits for Spatial Attention and Unilateral Neglect , 1987 .

[40]  M. Posner,et al.  Neural systems control of spatial orienting. , 1982, Philosophical transactions of the Royal Society of London. Series B, Biological sciences.

[41]  H. Buchtel,et al.  Spatial attentional shifts: Implications for the role of polysensory mechanisms , 1988, Neuropsychologia.

[42]  M. Mesulam.  A cortical network for directed attention and unilateral neglect , 1981, Annals of neurology.

[43]  A. Young,et al.  “Neglect dyslexia” and the early visual processing of letters in words and nonwords , 1987 .

[44]  F. Lhermitte,et al.  Négligence visuelle dans les lésions postérieures de l'hémisphere gauche. , 1979 .

[45]  E. Renzi,et al.  Hemispheric contribution to exploration of space through the visual and tactile modality. , 1970, Cortex; a journal devoted to the study of the nervous system and behavior.

[46]  M. Mesulam,et al.  Right cerebral dominance in spatial attention. Further evidence based on ipsilateral neglect. , 1987, Archives of neurology.

[47]  H. Buchtel,et al.  Spatial attentional shifts: Further evidence for the role of polysensory mechanisms using visual and tactile stimuli , 1989, Neuropsychologia.

[48]  Robert B. Katz,et al.  Positional dyslexia , 1989, Brain and Language.

[49]  E. Renzi,et al.  Auditory extinction following hemisphere damage , 1984, Neuropsychologia.

[50]  Kenneth M. Heilman,et al.  Hemispatial neglect affected by non‐neglected stimuli , 1988, Neurology.

[51]  D. Perani,et al.  Brain and conscious representation of outside reality , 1981, Neuropsychologia.

[52]  W. R. Brain.  VISUAL DISORIENTATION WITH SPECIAL REFERENCE TO LESIONS OF THE RIGHT CEREBRAL HEMISPHERE , 1941 .

[53]  M. Kinsbourne.  The cerebral basis of lateral asymmetries in attention. , 1970, Acta psychologica.

[54]  S. Jay Samuels,et al.  Toward a theory of automatic information processing in reading , 1974 .

[55]  Alexander Pollatsek,et al.  Recognition of visual letter strings following injury to the posterior visual spatial attention system , 1988 .

[56]  Patrizia Bisiacchi,et al.  L'aachner Aphasie Test (Aat) II. Proprietà Psicometriche Della Versione Italiana , 1987 .

[57]  C Luzzatti,et al.  Unilateral neglect, representational schema and consciousness. , 1979, Brain : a journal of neurology.

[58]  The aachen aphasia test aat ii psychometric properties of the italian version , 1987 .

[59]  B. Julesz.  Textons, the elements of texture perception, and their interactions , 1981, Nature.

[60]  A. Schwartz,et al.  The asymmetric lateralization of tactile extinction in patients with unilateral cerebral dysfunction. , 1979, Brain : a journal of neurology.

[61]  K. Heilman,et al.  Changes in the symptoms of neglect induced by changing task strategy. , 1978, Archives of neurology.

[62]  M M Mesulam,et al.  Visual hemispatial inattention: stimulus parameters and exploratory strategies. , 1988, Journal of neurology, neurosurgery, and psychiatry.