Position of the Egocentric Reference and Directional Arm Movements in Right-Brain-Damaged Patients

Chokron, Sylvie; Bartolomeo, Paolo

doi:10.1006/brcg.1998.1005

Cited by 24 publications

(19 citation statements)

References 36 publications

(55 reference statements)

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“…Contrary to the control subjects, the position of the starting point significantly influenced the position of the subjective sagittal middle in the left neglect patients (F (3, 3) = 7.30; P < 0.0007). The more leftward the starting point, the more the pointing was deviated to the left; likewise, the more rightward the starting point, the more the pointing was deviated to the right (see Table 2), confirming previous results [1,[11][12][13].…”

Section: Methodssupporting

confidence: 87%

“…2 and Table 2). The starting point had no significant effect in the control subjects, as previously reported [13]. Table 2).…”

Section: Methodssupporting

confidence: 81%

“…Moreover, only two patients (#1 and #12) exhibited systematic right-shifted pointing whatever the starting point (left-sided versus right-sided). In six patients (#2, #3, #4, #6, #7 and #8), the scanning direction induced a deviation of the subjective sagittal middle towards the starting point (rightward deviation for right-to-left scanning, and leftward deviation for left-to-right scanning), confirming the results of studies using the same protocol [11][12][13]. In patients #3, #4, #7 and #8, the absence of a significant overall deviation stemmed from the opposite deviations that occurred with a rightward versus a leftward motor direction (see Table 2).…”

Section: Methodssupporting

confidence: 69%

“…In keeping with previous findings [1,11,13,22,47] when pointing straight ahead, five of the 12 neglect patients A left deviation is coded as '−'; a right deviation is coded as '+'; SP, starting position.…”

Section: Methodsmentioning

confidence: 71%

“…These assertions stand in sharp contrast with the literature on the position of the ER in neglect, and with the characterization of left neglect signs in the visual and tactile modalities. Whereas some authors have described an ipsilateral shift of the subjective sagittal middle when right-brain damaged (RBD) patients with left neglect (RBDN+) are asked to point straight ahead without any visual information [16,32,44], several authors, when testing larger groups of RBD patients with or without neglect signs (RBDN+ and RBDN− patients), have found no correlation between neglect signs in visuo-spatial tasks and either the presence or the side of a deviation of the ER position recorded during a proprioceptive straight-ahead pointing task [1,11,13,22,47,49].…”

Section: Introductionmentioning

confidence: 99%

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Visual, proprioceptive and tactile performance in left neglect patients

et al. 2002

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Patients with unilateral spatial neglect due to right-hemisphere lesions typically fail to attend to and explore left-sided stimulus objects [32]. It has been postulated that in right-brain damaged (RBD) patients an ipsilesional displacement of the egocentric frame of reference (ER), whether visual or tactile, may be responsible for a contralesional supramodal spatial bias causing their left neglect behavior [39]. However, this hypothesis had been proposed without testing, in the same patients, the position of the ER or their performance in the visual and tactile modalities. Thus, the aim of the present study was to test the hypothesis that an ipsilateral shift of the ER is responsible for a supramodal spatial bias in neglect.For this purpose, a within-subject design is required. Consequently, 12 left neglect patients and 12 control subjects were asked to perform a proprioceptive straight-ahead pointing task while blindfolded, as well as visual and tactile bisection tasks.In the left neglect patients, we found:(i) no systematic deviation of the ER on the ipsilesional right side; (ii) a significant rightward bias in visual bisection, and normal performance in tactile bisection; (iii) no correlation among the three tasks; (iv) that only visual bisection correlated with the severity of neglect.These results are discussed with regard to the egocentric and attentional hypothesis of neglect.

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Section: Methodssupporting

confidence: 87%

“…2 and Table 2). The starting point had no significant effect in the control subjects, as previously reported [13]. Table 2).…”

Section: Methodssupporting

confidence: 81%

Section: Methodssupporting

confidence: 69%

Section: Methodsmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

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Visual, proprioceptive and tactile performance in left neglect patients

et al. 2002

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Motor Minds and Mental Models in Neglect

Chatterjee

1998

Brain and Cognition

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Eye eccentricity modifies the perception of whole-body rotation

2009

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In order to explore the effect of gaze orientation on whole-body rotation perception, ten healthy participants were rotated in the dark while fixating on a visual target located either straight ahead or 15 degrees to the right. A vestibular-memory contingent saccade paradigm was used to estimate the rotation perception. The results attest to the participants' ability to accurately perceive their rotation, based solely on the intrinsic inputs (somesthetic and mainly vestibular), since the correlation between the imposed body rotation and the saccade amplitude was significant and positive. However, the rotation perception was less accurate and of lesser magnitude when the gaze was deviated in the opposite direction to the rotation than when it was either straight ahead or deviated in the direction of the rotation. This can be interpreted as the perceptual equivalent of Alexander's law.

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Position of the Egocentric Reference and Directional Arm Movements in Right-Brain-Damaged Patients

Cited by 24 publications

References 36 publications

Visual, proprioceptive and tactile performance in left neglect patients

Visual, proprioceptive and tactile performance in left neglect patients

Motor Minds and Mental Models in Neglect

Eye eccentricity modifies the perception of whole-body rotation

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