Auditory inattention in right-hemisphere-damaged patients with and without visual neglect

Soroker, Nachum; Calamaro, Nir; Glicksohn, Joseph; Myslobodsky, Michael S.

doi:10.1016/s0028-3932(96)00038-3

Cited by 60 publications

(29 citation statements)

References 31 publications

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“…Interestingly, our results showed that the midpoint of the range perceived as the centre in the auditory field was deviated to the right in the same way as deviation of visual localisation in unilateral visuospatial neglect. If these phenomena are derived from a common supramodal system for spatial attention, a substantial degree of correlation should be expected between neglect manifestations in different sensory modalities 10. We noticed failure of patients with RBD to recognise a sound image shift from the centre— that is, an increase in the threshold of discrimination of interaural time difference.…”

Section: Discussionmentioning

confidence: 71%

Sound lateralisation in patients with left or right cerebral hemispheric lesions: relation with unilateral visuospatial neglect

Hachisuka

Ogata

1999

Journal of Neurology, Neurosurgery & Psychiatry

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Objectives-To localise the brain lesion that causes disturbances of sound lateralisation and to examine the correlation between such deficit and unilateral visuospatial neglect. Method-There were 29 patients with right brain damage, 15 patients with left brain damage, and 22 healthy controls, who had normal auditory and binaural thresholds. A device was used that delivered sound to the left and right ears with an interaural time diVerence using headphones. The amplitude (an index of ability to detect sound image shifts from the centre) and midpoint (an index of deviation of the interaural time diVerence range perceived as the centre) parameters of interaural time diVerence were analysed in each subject using 10 consecutive stable saw toothed waves. Results-The amplitude of interaural time diVerence was significantly higher in patients with right brain damage than in controls. The midpoint of the interaural time diVerence was significantly more deviated in patients with right brain damage than in those with left brain damage and controls (p<0.05). Patients with right brain damage with lesions aVecting both the parietal lobe and auditory pathway showed a significantly higher amplitude and deviated midpoint than the controls, whereas right brain damage with involvement of only the parietal lobe showed a midpoint significantly deviated from the controls (p<0.05). Abnormal sound lateralisation correlated with unilateral visuospatial neglect (p<0.05). Conclusions-The right parietal lobe plays an important part in sound lateralisation. Sound lateralisation is also influenced by lesions of the right auditory pathway, although the eVect of such lesions is less than that of the right parietal lobe. Disturbances of sound lateralisation correlate with unilateral visuospatial neglect. (J Neurol Neurosurg Psychiatry 1999;67:481-486)

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Section: Discussionmentioning

confidence: 71%

Sound lateralisation in patients with left or right cerebral hemispheric lesions: relation with unilateral visuospatial neglect

Hachisuka

Ogata

1999

Journal of Neurology, Neurosurgery & Psychiatry

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“…Considering, for example, the sensory modalities of expression of neglect, evidence indicates that, although neglect is by no means exclusive to visually presented material (which by itself challenges explanations based on a unimodal sensory de®cit [51]), when patients' performance in tactile or imagery tests is directly compared with their performance in visuospatial tests, neglect usually results more common and severe for visual than for nonvisual stimuli, as tactile [59±61] or imagined [62] events. Also for auditory neglect, it has been shown that blindfolding improves the ability of neglect patients to correctly localize sound stimuli originating on the left [63]. Thus, one can conclude that visually presented stimuli exacerbate neglect [64].…”

Section: Accounts Of Left Unilateral Neglectmentioning

confidence: 98%

Orienting of attention in left unilateral neglect

Bartolomeo

Chokron

2002

Neuroscience & Biobehavioral Reviews

284

137

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After right posterior brain damage, patients may ignore events occurring on their left, a condition known as unilateral neglect. Although de®cits at different levels of impairment may be at work in different patients, the frequency and severity of attentional problems in neglect patients have been repeatedly underlined. Recent advances in the knowledge of the mechanisms of spatial attention in normals may help characterizing these de®cits. The present review focuses on studies exploring several aspect of attentional processing in unilateral neglect, with particular reference to the dichotomy between`exogenous', or stimulus-related, and`endogenous', or strategy-driven, orienting of attention. A large amount of neuropsychological evidence suggests that a basic mechanism leading to left neglect behavior is an impaired exogenous orienting toward left-sided targets. In contrast, endogenous processes seem to be relatively preserved, if slowed, in left unilateral neglect. Other component de®cits, such as a general slowing of the operations of spatial attention, might contribute to neglect behavior. These results are presented and discussed, and their implications for hemispheric specialization in attentional orienting and for the mechanisms of visual consciousness are explored. q

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“…Likewise, human lesion studies have been inconclusive. Although impaired spatial attention to both visual and auditory stimuli may coexist in patients with frontal or parietal lesions, several reports demonstrate double dissociation between the visual and auditory deficits, (that is, auditory deficits occurring in the absence of visual deficits and vice versa), suggesting modality-specific subsystems subserving spatial selective attention within the frontoparietal regions 16,18,19,45 . An alternative interpretation consistent with the supramodal model is that frontal and parietal cortical lesions may differentially disrupt visual or auditory projections to supramodal attentional centers in the frontoparietal regions, resulting in selective visual or auditory deficits 44 .…”

Section: Spatial Selective Attentionmentioning

confidence: 99%

Modality-specific frontal and parietal areas for auditory and visual spatial localization in humans

et al. 1999

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Although the importance of the posterior parietal and prefrontal regions in spatial localization of visual stimuli is well established, their role in auditory space perception is less clear. Using positron emission tomography (PET) during auditory and visual spatial localization in the same subjects, modality-specific areas were identified in the superior parietal lobule, middle temporal and lateral prefrontal cortices. These findings suggest that, similar to the visual system, the hierarchical organization of the auditory system extends beyond the temporal lobe to include areas in the posterior parietal and prefrontal regions specialized in auditory spatial processing. Our results may explain the dissociation of visual and auditory spatial localization deficits following lesions involving these regions.

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Auditory inattention in right-hemisphere-damaged patients with and without visual neglect

Cited by 60 publications

References 31 publications

Sound lateralisation in patients with left or right cerebral hemispheric lesions: relation with unilateral visuospatial neglect

Sound lateralisation in patients with left or right cerebral hemispheric lesions: relation with unilateral visuospatial neglect

Orienting of attention in left unilateral neglect

Modality-specific frontal and parietal areas for auditory and visual spatial localization in humans

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