Cerebral correlates of visuospatial neglect: A direct cerebral stimulation study

Vallar, Giuseppe; Bello, Lorenzo; Bricolo, Emanuela; Castellano, Antonella; Casarotti, Alessandra; Falini, Andrea; Riva, Marco; Fava, Enrica; Papagno, Costanza

doi:10.1002/hbm.22257

Cited by 94 publications

(51 citation statements)

References 123 publications

(278 reference statements)

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“…For instance, a disconnection of the second branch of the SLF is supposed to prevent interactions between the ventral and dorsal attentional networks , thus damaging the control of attention. In our patients, preservation of the SLF (see also Vallar et al, 2013) may have opened the doors to functional recovery.…”

Section: 3mentioning

confidence: 86%

“…This result led to the proposal of intra-operative assessment of line bisection as a tool to prevent post-operative neglect in low-grade glioma patients (Bartolomeo, Thiebaut de Schotten, & Doricchi, 2007). These findings were subsequently confirmed (Vallar et al, 2013), although with some intersubject variability (Roux et al, 2011). Moreover postoperative assessment in two low-grade glioma patients supports the importance of SLF damage in neglect, by uncovering new or worsened signs of left neglect after surgical section of the SLF (Shinoura et al, 2009).…”

Section: Introductionmentioning

confidence: 83%

See 1 more Smart Citation

Functional reorganization of the attentional networks in low-grade glioma patients: A longitudinal study

Charras

Herbet

Deverdun

et al. 2015

Cortex

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Section: 3mentioning

confidence: 86%

Section: Introductionmentioning

confidence: 83%

Functional reorganization of the attentional networks in low-grade glioma patients: A longitudinal study

Charras

Herbet

Deverdun

et al. 2015

Cortex

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“…The inferior and superior parietal, angular, and supramarginal gyrus, along with the non-dominant SLF, have been investigated with intraoperative mapping, given their hypothesized relationship to visuospatial and attention functions [2, 12]. Mapping to define eloquence in regards to visuospatial function has traditionally been performed with the line bisection test to prevent postoperative neglect [10].…”

Section: Discussionmentioning

confidence: 99%

“…Craniotomies are planned based on tumor/eloquent cortex boundaries with the intent to maximally resect the tumor burden. This is substantially aided by superimposed intraoperative DTI fiber tractography, which, in our experience, aids in the identification of eloquent cortical and subcortical regions and, thus, operative planning [2]. Stimulation was carried out at the lowest current that produced a deficit or did not result in after-discharges.…”

Section: Technical Reportmentioning

confidence: 99%

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The Use of the Target Cancellation Task to Identify Eloquent Visuospatial Regions in Awake Craniotomies: Technical Note

Conner¹,

Glenn²,

Burks³

et al. 2016

Cureus

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The success of awake craniotomies relies on the patient’s performance of function-specific tasks that are simple, quick, and reproducible. Intraoperative identification of visuospatial function through cortical and subcortical mapping has utilized a variety of intraoperative tests, each with its own benefits and drawbacks. In light of this, we developed a simple software program that aids in preventing neglect by simulating a target-cancellation task on a portable electronic device. In this report, we describe the interactive target cancellation task and have reviewed seven consecutive patients who underwent awake craniotomy for parietal and/or posterior temporal infiltrating brain tumors of the non-dominant hemisphere. Each of these patients performed target cancellation and line bisection tasks intraoperatively. The outcomes of each patient and testing scenario are described. Positive intraoperative cortical and subcortical sites involved with visuospatial processing were identified in three of the seven patients using the target cancellation and confirmed utilizing the line-bisection task. No identification of visuospatial function was accomplished utilizing the line-bisection task alone. Complete visuospatial function mapping was completed in less than 10 minutes in all patients. No patients had preoperative or postoperative hemineglect. Our findings highlight the feasibility of the target cancellation technique for use during awake craniotomy to aid in avoiding postoperative hemineglect. Target cancellation may offer an alternative method of cortical and subcortical visuospatial mapping in patients unable to perform other commonly used modalities.

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White matter connections of the inferior parietal lobule: A study of surgical anatomy

et al. 2017

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IntroductionInterest in the function of the inferior parietal lobule (IPL) has resulted in increased understanding of its involvement in visuospatial and cognitive functioning, and its role in semantic networks. A basic understanding of the nuanced white‐matter anatomy in this region may be useful in improving outcomes when operating in this region of the brain. We sought to derive the surgical relationship between the IPL and underlying major white‐matter bundles by characterizing macroscopic connectivity.MethodsData of 10 healthy adult controls from the Human Connectome Project were used for tractography analysis. All IPL connections were mapped in both hemispheres, and distances were recorded between cortical landmarks and major tracts. Ten postmortem dissections were then performed using a modified Klingler technique to serve as ground truth.ResultsWe identified three major types of connections of the IPL. (1) Short association fibers connect the supramarginal and angular gyri, and connect both of these gyri to the superior parietal lobule. (2) Fiber bundles from the IPL connect to the frontal lobe by joining the superior longitudinal fasciculus near the termination of the Sylvian fissure. (3) Fiber bundles from the IPL connect to the temporal lobe by joining the middle longitudinal fasciculus just inferior to the margin of the superior temporal sulcus.ConclusionsWe present a summary of the relevant anatomy of the IPL as part of a larger effort to understand the anatomic connections of related networks. This study highlights the principle white‐matter pathways and highlights key underlying connections.

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Cerebral correlates of visuospatial neglect: A direct cerebral stimulation study

Cited by 94 publications

References 123 publications

Functional reorganization of the attentional networks in low-grade glioma patients: A longitudinal study

Functional reorganization of the attentional networks in low-grade glioma patients: A longitudinal study

The Use of the Target Cancellation Task to Identify Eloquent Visuospatial Regions in Awake Craniotomies: Technical Note

White matter connections of the inferior parietal lobule: A study of surgical anatomy

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