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Unilateral spatial neglect

Yukichi Inoue
The management of higher brain dysfunctions such as stroke-induced unilateral spatial neglect (USN) or aphasia is crucial because these dysfunctions have devastating neurological repercussions on the patients' daily life and quality of life. Impairment of the physiological interhemispheric rivalry is often the result of brain insults such as strokes or traumatic injuries, and it may lead to USN or aphasia. Repetitive transcranial magnetic stimulation (rTMS), a non-invasive brain stimulation method, is a promising tool for restoring the pathological imbalance in interhemispheric rivalry by either suppressing the hyperactivity of the unaffected hemisphere or facilitating hypoactivity in the affected hemisphere...
December 2016: Brain and Nerve, Shinkei Kenkyū No Shinpo
Gustavo José Luvizutto, Gabriela Rizzo Soares Rizzati, Marcelo Ortolani Fogaroli, Rodrigo Thomazi Rodrigues, Priscila Watson Ribeiro, Hélio Rubens de Carvalho Nunes, Gabriel Pereira Braga, Rafael Dalle Molle da Costa, Silméia Garcia Zanati Bazan, Luiz Antônio de Lima Resende, Adriana Bastos Conforto, Rodrigo Bazan
BACKGROUND: Unilateral spatial neglect (USN) is characterized by the inability to report or respond to people or objects that are presented in the spatial hemisphere that is contralateral to the lesioned hemisphere of the brain. USN has been associated with poor functional outcomes and long stays in hospitals and rehabilitation centers. Noninvasive brain stimulation, such as transcranial direct current stimulation (tDCS), has been used in people who have been affected by USN after stroke...
October 3, 2016: Trials
Marie Jaeger, Eve Dupierrix, Céline Piscicelli, Anne Chrispin, Patrice Davoine, Dominic Pérennou
OBJECTIVE: Unilateral spatial neglect (USN) and verticality perception biases are frequently associated after right hemispheric cerebral stroke (Pérennou et al., 2006). These troubles in spatial cognition have also in common to present different clinical types, according to the space considered: personal (PN) and extra-personal neglect (EPN), and biases in the visual (VV) or the postural (PV) vertical. Here, we hypothesized that PN is specially related to a biased PV, and that EPN could be more related to a biased VV...
September 2016: Annals of Physical and Rehabilitation Medicine
Eleni Papathanasiou, Mathilde Chevignard, Carole Vuillerot, Anne Tiberghien, Ingrid Godard
OBJECTIVE: Paediatric stroke is a relatively rare medical condition, but it often leads to long lasting motor and cognitive impairments. Rehabilitation of motor impairments has been widely studied, with most studies performed in children with cerebral palsy (CP). However, CP covers a variety of medical conditions, including brain lesions due to paediatric stroke occurring early in life, but not stroke occurring later on during childhood. The specificity of rehabilitation after paediatric stroke remains understudied...
September 2016: Annals of Physical and Rehabilitation Medicine
Yusaku Takamura, Maho Imanishi, Madoka Osaka, Satoko Ohmatsu, Takanori Tominaga, Kentaro Yamanaka, Shu Morioka, Noritaka Kawashima
Unilateral spatial neglect is a common neurological syndrome following predominantly right hemispheric stroke. While most patients lack insight into their neglect behaviour and do not initiate compensatory behaviours in the early recovery phase, some patients recognize it and start to pay attention towards the neglected space. We aimed to characterize visual attention capacity in patients with unilateral spatial neglect with specific focus on cortical processes underlying compensatory gaze shift towards the neglected space during the recovery process...
September 23, 2016: Brain: a Journal of Neurology
Brenton Kortman, Kate Nicholls
The aim of this feasibility study was to identify whether eye-tracking glasses could sensitively differentiate unilateral spatial neglect (USN) among a sample of participants who had a stroke, and to determine whether a larger study was viable. A sample of 13 inpatients (N = 7 with neglect, N = 6 without neglect) aged 50-78 years undertook a task while wearing Tobii eye-tracking glasses. The kitchen environment and the task of making a cup of coffee were standardized. Two commonly reported tests for USN, the Bells Test and the Line Crossing Test, were also used as a reference standard for the eye-tracking data...
August 5, 2016: Occupational Therapy in Health Care
Takaaki Fujita, Atsushi Sato, Yuichi Yamamoto, Koji Otsuki, Kazuaki Iokawa, Toshimasa Sone, Manabu Midorikawa, Kenji Tsuchiya, Lee Bumsuk, Fusae Tozato
[Purpose] Dressing is an activity of daily living for which stroke patients often show discrepancies between capacity and actual performance. The aim of this study was to elucidate the physical function and unilateral spatial neglect in stroke patients that reduce their level of actual performance despite having the capacity for dressing independently. [Subjects and Methods] This retrospective study included 60 first-time stroke patients judged by occupational therapists as able to dress independently. The patients were divided into two groups according to their FIM(®) instrument scores for dressing the upper and lower body: an independent group with both scores ≥6 and an assistance group with one or both scores ≤5...
June 2016: Journal of Physical Therapy Science
Emily S Grattan, Catherine E Lang, Rebecca Birkenmeier, Margo Holm, Elaine Rubinstein, Jessie Van Swearingen, Elizabeth R Skidmore
OBJECTIVE: We examined the feasibility, tolerability, and preliminary efficacy of repetitive task-specific practice for people with unilateral spatial neglect (USN). METHOD: People with USN ≥6 mo poststroke participated in a single-group, repeated-measures study. Attendance, total repetitions, and satisfaction indicated feasibility and pain indicated tolerability. Paired t tests and effect sizes were used to estimate changes in upper-extremity use (Motor Activity Log), function (Action Research Arm Test), and attention (Catherine Bergego Scale)...
July 2016: American Journal of Occupational Therapy: Official Publication of the American Occupational Therapy Association
Alma Guilbert, Sylvain Clément, Yves Martin, Alexia Feuillet, Christine Moroni
While mechanisms of orienting attention in unilateral spatial neglect (USN) have frequently been studied in the visual domain, these mechanisms remain relatively unexplored in the auditory domain. Our first goal was to replicate Spence and Driver's (J Exp Psychol Hum 22:1005-1030, 1994) results with a virtual reality paradigm. This paradigm simulated a 3-dimensional auditory space with headphones. Our second aim was to study auditory profiles of orienting attention in USN. In a first experiment, 18 healthy participants performed an auditory cueing spatial paradigm (either a target-detection task or a target-lateralization task)...
October 2016: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
Alessio Facchin, Nicoletta Beschin, Alessia Pisano, Cristina Reverberi
Line bisection is one of the tests used to diagnose unilateral spatial neglect (USN). Despite its wide application, no procedure or norms were available for the distal variant when the task was performed at distance with a laser pointer. Furthermore, the baking tray task was an ecological test aimed at diagnosing USN in a more natural context. The aim of this study was to collect normative values for these two tests in an Italian population. We recruited a sample of 191 healthy subjects with ages ranging from 20 to 89 years...
September 2016: Neurological Sciences
Nadia Bolognini, Silvia Convento, Carlotta Casati, Flavia Mancini, Filippo Brighina, Giuseppe Vallar
Recent neuropsychological evidence suggests that acquired brain lesions can, in some instances, abolish the ability to integrate inputs from different sensory modalities, disrupting multisensory perception. We explored the ability to perceive multisensory events, in particular the integrity of audio-visual processing in the temporal domain, in brain-damaged patients with visual field defects (VFD), or with unilateral spatial neglect (USN), by assessing their sensitivity to the 'Sound-Induced Flash Illusion' (SIFI)...
July 1, 2016: Neuropsychologia
Antonella Di Vita, Liana Palermo, Laura Piccardi, Jessica Di Tella, Filomena Propato, Cecilia Guariglia
There is still a matter of debate around the nature of personal neglect. Is it an attention disorder or a body representation disorder? Here we investigate the presence of body representation deficits (i.e., the visuo-spatial body map) in right and left brain-damaged patients and in particular in those affected by personal neglect. 23 unilateral brain-damaged patients (5 left-brain-damaged and 18 right-brain-damaged patients) and 15 healthy controls took part in the study. The visuo-spatial body map was assessed by means of the "Frontal body-evocation subtest (FBE)," in which participants have to put tiles representing body parts on a small wooden board where only the head is depicted as a reference point...
May 16, 2016: Applied Neuropsychology. Adult
Raffaella Ricci, Adriana Salatino, Francesca Garbarini, Irene Ronga, Rosanna Genero, Anna Berti, Marco Neppi-Mòdona
Patients with visuospatial neglect when asked to cancel targets partially or totally omit to cancel contralesional stimuli. It has been shown that increasing the attentional demands of the cancellation task aggravates neglect contralesionally. However, some preliminary evidence also suggests that neglect might be worsened by engaging the patient in a demanding, non-spatial, cognitive activity (i.e. a mathematical task). We studied cancellation performance of 16 patients with right-hemisphere lesions, 8 with neglect, 8 without neglect, and 8 age-matched healthy control participants by means of five cancellation tasks which varied for the degree of attentional and/or high level cognitive demands (preattentive and attentive search of a visual target, searching for numbers containing the digit 3, even numbers, and multiples of 3)...
May 3, 2016: Neuropsychologia
Maryam Fourtassi, Gilles Rode, Caroline Tilikete, Laure Pisella
Spontaneous eye movements during imagery are not random and can be used to study and reveal mental visualization processes (Fourtassi et al., 2013; Johansson et al. 2006). For example, we previously showed that during memory recall of French towns via imagery healthy individuals looks straight ahead when recalling Paris and their subsequent gaze positions are significantly correlated with the real GPS coordinates of the recalled towns. This correlation suggests that memory retrieval is done via depictive representations as it is never found when the towns are recalled using verbal fluency...
April 26, 2016: Neuropsychologia
Alexandra Ernst, Laurène Gourisse, Grégoire Wauquiez, Céline Souchay
Unilateral spatial neglect (USN) is mainly defined as a condition affecting perception and the mental representation of the environment. However, nothing is known about its impact on the ability to mentally represent one's past and on personal identity. We addressed these questions in a case of chronic USN, DR, a 59-year-old right-handed woman, who underwent a variety of measures exploring the self and autobiographical memory (AM). DR showed preserved self-images and her AM performance was only preserved when memories were prompted by her own self-images and not by self-unrelated cues...
June 2016: Neurocase
G Rode, C Pagliari, L Huchon, Y Rossetti, L Pisella
Hemispatial neglect is a common disabling condition following brain damage to the right hemisphere. Generally, it involves behavioral bias directed ipsilaterally to the damaged hemisphere and loss of spatial awareness for the contralesional side. In this syndrome, several clinical subtypes were identified. The objective of this article is to provide a nosological analysis of the recent data from the literature on the different subtypes of neglect (visual, auditory, somatosensory, motor, egocentric, allocentric and representational neglect), associated ipsilesional and contralesional productive manifestations and their anatomical lesion correlates...
April 18, 2016: Annals of Physical and Rehabilitation Medicine
Shunichi Sugihara, Toshiaki Tanaka, Tomoya Miyasaka, Takashi Izumi, Koichi Shimizu
[Purpose] The purpose of this study was the development of a method for presenting diverse visual information and assessing visual space recognition using a new head mounted display (HMD) system. [Subjects] Eight patients: four with unilateral spatial neglect (USN) and four with visual field defects (VFD). [Methods] A test sheet was placed on a desk, and its image was projected on the display of the HMD. Then, space recognition assessment was conducted using a cancellation test and motion analysis of the eyeballs and head under four conditions with images reduced in size and shifted...
January 2016: Journal of Physical Therapy Science
Maryam Fourtassi, Gilles Rode, Laure Pisella
Visual mental imagery is a cognitive experience characterised by the activation of the mental representation of an object or scene in the absence of the corresponding stimulus. According to the analogical theory, mental representations have a pictorial nature that preserves the spatial characteristics of the environment that is mentally represented. This cognitive experience shares many similarities with the experience of visual perception, including eye movements. The mental visualisation of a scene is accompanied by eye movements that reflect the spatial content of the mental image, and which can mirror the deformations of this mental image with respect to the real image, such as asymmetries or size reduction...
March 30, 2016: Annals of Physical and Rehabilitation Medicine
Alma Guilbert, Sylvain Clément, Latifa Senouci, Sylvain Pontzeele, Yves Martin, Christine Moroni
Although visual deficits due to unilateral spatial neglect (USN) have been frequently described in the literature, fewer studies have been interested in directional hearing impairment in USN. The aim of this study was to explore sound lateralisation deficits in USN. Using a paradigm inspired by Tanaka et al. (1999), interaural time differences (ITD) were presented over headphones to give the illusion of a leftward or a rightward movement of sound. Participants were asked to respond "right" and "left" as soon as possible to indicate whether they heard the sound moving to the right or to the left side of the auditory space...
May 2016: Neuropsychologia
Daniela Conti, Santo Di Nuovo, Angelo Cangelosi, Alessandro Di Nuovo
In this paper, we present the experimental results of an embodied cognitive robotic approach for modelling the human cognitive deficit known as unilateral spatial neglect (USN). To this end, we introduce an artificial neural network architecture designed and trained to control the spatial attentional focus of the iCub robotic platform. Like the human brain, the architecture is divided into two hemispheres and it incorporates bio-inspired plasticity mechanisms, which allow the development of the phenomenon of the specialization of the right hemisphere for spatial attention...
August 2016: Cognitive Processing
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