scholarly journals Recent trends in rehabilitation interventions for visual neglect and anosognosia for hemiplegia following right hemisphere stroke

2011 ◽  
Vol 6 (1) ◽  
pp. 33-43 ◽  
Author(s):  
Kathleen B Kortte ◽  
Argye E Hillis
Keyword(s):  
Right Hemisphere ◽  
Visual Neglect ◽  
Recent Trends ◽  
Anosognosia For Hemiplegia ◽  
Right Hemisphere Stroke

scholarly journals The Presence of Visual Neglect after Thrombolytic Treatment in Patients with Right Hemisphere Stroke

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
J. E. Kettunen ◽  
M. Nurmi ◽  
A.-M. Koivisto ◽  
P. Dastidar ◽  
M. Jehkonen
Keyword(s):  
Right Hemisphere ◽  
Stroke Severity ◽  
Study Group ◽  
Thrombolytic Treatment ◽  
Visual Neglect ◽  
Stroke Patients ◽  
Neuropsychological Examination ◽  
The Difference ◽  
Right Hemisphere Stroke

Visual neglect (VN) is a common consequence of right hemisphere (RH) stroke. The aims of this study were to explore the presence of VN after RH stroke in the patients with (T+) or without (T−) thrombolytic treatment, and to determine whether thrombolysis is a predictor of VN. The study group consisted of 77 RH infarct patients. VN was evaluated with six conventional subtests of the Behavioural Inattention Test (BIT). Stroke severity was assessed using the National Institute of Health Stroke Scale (NIHSS). In the neuropsychological examination, 22% of all RH stroke patients had VN. VN was present in 15% of the patients in the T+ group and in 28% of the patients in the T− group, but the difference was not statistically significant. Despite that, patients in the T− group had a higher risk of VN than patients in the T+ group. Our results suggest that thrombolysis independently predicted absence of VN.

scholarly journals Motor versus body awareness: Voxel-based lesion analysis in anosognosia for hemiplegia and somatoparaphrenia following right hemisphere stroke

Cortex ◽  
2016 ◽  
Vol 83 ◽  
pp. 62-77 ◽  
Author(s):  
Valentina Moro ◽  
Simone Pernigo ◽  
Manos Tsakiris ◽  
Renato Avesani ◽  
Nicola M.J. Edelstyn ◽  
...  
Keyword(s):  
Right Hemisphere ◽  
Body Awareness ◽  
Lesion Analysis ◽  
Anosognosia For Hemiplegia ◽  
Right Hemisphere Stroke

scholarly journals Updating Beliefs Beyond the Here-and-Now: The Counter-factual Self in Anosognosia for Hemiplegia

2020 ◽  
Author(s):  
Louise P Kirsch ◽  
Christoph Mathys ◽  
Christina Papadaki ◽  
Penelope Talelli ◽  
Karl Friston ◽  
...  
Keyword(s):  
Bayesian Learning ◽  
Right Hemisphere ◽  
Sensory Information ◽  
Self Awareness ◽  
Belief Updating ◽  
Visuospatial Neglect ◽  
Motor Abilities ◽  
Associated Lesions ◽  
Anosognosia For Hemiplegia ◽  
Right Hemisphere Stroke

The syndrome of anosognosia for hemiplegia (AHP), or the lack of awareness for one’s paralysis following right hemisphere stroke, can provide unique insights into the neurocognitive mechanisms of self-awareness. Yet it remains unclear whether AHP is a modality-specific deficit of sensorimotor monitoring, or whether domain-general processes of attention and belief-updating converge to cause AHP. Using a Bayesian learning framework, we formalised and empirically investigated the hypothesis that failures to update anosognosic beliefs can be explained by abnormalities in the relative uncertainty (i.e. precision) ascribed to prior beliefs versus sensory information in different contexts. We designed a new motor belief-updating task that manipulated both the temporal (prospective and retrospective) and spatial (hemispace most affected by inattention and hemispace less affected by inattention) conditions in which beliefs had to be updated, and we validated its sensitivity to AHP in 26 patients with right hemisphere stroke. We then computed and empirically tested two different Bayesian predictors of prospective beliefs using two proxies for precision in AHP patients: (i) standardised, neuropsychological measures of objective attention abilities, i.e. visuospatial neglect scores, and (ii) subjective uncertainty reports, i.e. confidence ratings. Our results suggest that while neglect does not affect local, sensorimotor error monitoring, it does seem to affect the degree to which observed errors are used to update more general, prospective beliefs about counterfactual motor abilities in AHP. Difficulties in such ‘counterfactual’ belief-updating were associated with disruptions in tracts of the ventral attentional network (i.e. superior longitudinal fasciculus connecting the temporo-parietal junction and ventral frontal cortex) and associated lesions to the insula, inferior parietal cortex and superior temporal regions. These results suggest that self-awareness extends beyond local, retrospective monitoring, requiring also salience-based, convergence of beliefs about the self that go beyond the ‘here-and-now’ of sensorimotor experience.

Map learning may be impaired after right-hemisphere stroke

2010 ◽  
Author(s):  
Peii Chen ◽  
C. Priscilla Galarza ◽  
Kimberly Hreha ◽  
Tara Miceli ◽  
Anna M. Barrett
Keyword(s):  
Right Hemisphere ◽  
Map Learning ◽  
Right Hemisphere Stroke
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