Neuroplasticity and brain reorganization associated with positive outcomes of multidisciplinary rehabilitation in progressive multiple sclerosis: A fMRI study.

BACKGROUND: Multiple sclerosis (MS) is characterized by a range of symptoms, including motor, sensorimotor and cognitive impairments, that limit the quality of life. A multidisciplinary rehabilitation approach in people affected by multiple sclerosis was recently reported to improve the functional abilities of MS patients in daily activities. The purpose of the study was to assess the effect of multidisciplinary rehabilitation on the whole brain of MS patients by means of functional magnetic resonance imaging (fMRI). METHODS: Thirty individuals affected by MS (49.9 ± 12.1 years; disease duration: 16.0 ± 8.5 years) with a medium-high severity of disease were enrolled. The fMRI examination assessed a range of action-related tasks involving passive movement, mental simulation of action and miming of action triggered by external stimuli, such as object photography. The three tasks were performed using each arm separately. The fMRI acquisitions were performed at T1 (inclusion in the study), T2 (3 months later, at the start of rehabilitation) and T3 (after 3 months of multidisciplinary rehabilitation). RESULTS: The fMRI results revealed a significant reduction in the activity of brain areas related to task-specific networks as well as the activation of cerebral regions not usually involved in task-specific related network, such as the medial prefrontal area. CONCLUSIONS: The effectiveness of multidisciplinary rehabilitation on activity and participation has been established in previous studies. Our study sheds new light on the effect of such treatment on brain reorganization.

Language-Related Brain Potentials in Patients With Disorders of Consciousness: A Follow-up Study to Detect "Covert" Language Disorders.

Background. Language disorders may occur in patients with disorders of consciousness (DoCs), and they could interfere with the behavioral assessment of consciousness and responsiveness. Objective. In this study, we retrospectively explored whether ERP N400 was eventually associated with the presence of aphasia diagnosed in those patients who had evolved into Exit-Minimally Conscious State (E-MCS) at the clinical follow-up. Methods. In this retrospective cohort study, the ERPs elicited by an auditory sentences task were retrospectively examined in a sample of 15 DoC patients diagnosed according to the Coma Recovery Scale-Revised (CRS-R). All these 15 DoC patients underwent a (at least) 1-year clinical follow-up, which included a neuropsychological evaluation to assess language function among other cognitive functions. Ten healthy individuals also underwent the same paradigm to investigate the variability of ERPs characteristics. Results. The N400 ERP component with centroparietal topography was found in 9 of 10 healthy controls in response to the ill-formed sentences. Analysis of patients' data revealed that (1) a significant N400 component could be detected in 64% (9 of 14 patients) of the DoC patients regardless of the type of DoC; (2) no significant N400 ERP component was retrospectively detected in those E-MCS patients who showed aphasia at the follow-up; and (3) the presence/absence of the N400-ERP component was consistent with the brain lesion side and significantly predict the recovery. Conclusion. These preliminary findings indicate that the absence of N400 was significantly associated with the presence of aphasia diagnosed at the clinical follow-up in E-MCS patients.

The Default Mode Network Connectivity Predicts Cognitive Recovery in Severe Acquired Brain Injured Patients: A Longitudinal Study.

To study the functional connectivity in patients with severe acquired brain injury is very challenging for their high level of disability because of a prolonged period of coma, extended lesions, and several cognitive and behavioral disorders. In this article, we investigated in these patients the default mode network and somatomotor connectivity changes at rest longitudinally, in the subacute and late phase after brain injury. The aim of the study is to characterize such connectivity patterns and relate the observed changes to clinical and neuropsychological outcomes of these patients after a period of intensive neurorehabilitation. Our findings show within the default mode network a disruption of connectivity of medial pre-frontal regions and a significant change of amplitude of internal connections. Notably, strongest changes in functional connectivity significantly correlated to consistent clinical and cognitive recovery. This evidence seems to indicate that the reorganization of the Default Mode Network may represent a valid biomarker for the cognitive recovery in patients with severe acquired brain injury.

[Gambling Disorder: epidemiology, diagnosis, interpretative models and intervention]. / Disturbo da gioco d'azzardo: epidemiologia, diagnosi, modelli interpretativi e trattamento.

Gambling disorder is a frequently underdiagnosed and disabling disorder with a prevalence greatly increased in recent decades. For various reasons, only a small part of pathological gamblers seek a support making difficult an early identification and delaying the administration of appropriate treatment. In DSM-5, the disorder has been reclassified from an "Impulse-Control Disorder not elsewhere classified" to one of the "Substance-Related and Addictive Disorders" with the intention of improve the diagnosis, to better targeting the treatment and to stimulating further research efforts directed to the disorder. This article reviews assessment techniques, psychosocial and neurobiological factors in the development of pathological gambling and treatment strategies.

Theory of mind impairment after severe traumatic brain injury and its relationship with caregivers' quality of life.

PURPOSE: Theory of mind (ToM) deficits are common consequences of severe Traumatic Brain Injury (sTBI), but little is known about their impact on patients' and their caregivers' quality of life. This study aimed (i) to examine the presence of ToM difficulties in individuals with sTBI and adequate levels of self-awareness (SA); (ii) to investigate their relationship with perceived Health Related Quality of Life (HRQoL) in patients and their caregivers. METHODS: Twenty individuals with sTBI and adequate levels of SA, and 20 healthy controls (HCs) were recruited. ToM was examined by the Faux-pas Recognition paradigm. The QOLIBRI questionnaire was administered to patients and their caregivers to assess their HRQoL. Cognitive functioning and psychopathology were evaluated. RESULTS: Individuals with sTBI were less accurate than HCs on the Faux-pas Recognition paradigm. Patients' satisfaction of HRQoL was related to their performance on the Wisconsin Card Sorting Test. Caregivers' satisfaction was significantly predicted by patients' score on the Faux-pas paradigm. CONCLUSIONS: ToM is impaired in individuals with sTBI and adequate levels of SA. Moreover, their ToM performance predicted HRQoL in the caregivers. From a clinical perspective, these results provide understanding of the potential impact of ToM impairment in subjects with sTBI and their social system.

Supplementary motor area activation is impaired in severe traumatic brain injury parkinsonism.

A high percentage of survivors of severe traumatic brain injury present diffuse axonal injury and extrapyramidal symptoms. The association between diffuse cerebral damage and parkinsonian symptoms is probably because of the interruption of nigro-striato-frontal pathways. While functional magnetic resonance imaging (fMRI) has been widely used to investigate parkinsonism in idiopathic Parkinson disease, little is known about functional brain modifications related to post-traumatic parkinsonism (PTP). The aim of this study is to assess cerebral activity of the action-related network in patients with PTP comparing these patients to matched healthy controls. In the fMRI scanner, we proposed to 12 PTP patients and 12 healthy control participants a continuum of tasks involving action-related word production, mental simulation of action, and miming of action triggered by external stimuli such as drawings of objects. Patients with PTP showed a main effect similar to that of healthy controls in all the tasks. Direct comparison revealed hypoactivation of areas in the action-related network in patients with PTP for all the tasks. During the mime of action, which involved actual movement, the hypoactivation was localized to the motor network. Our results suggest that patients with PTP showed a cerebral reorganization for motor tasks in agreement with the cerebral reorganization observed in idiopathic Parkinson disease. For patients with PTP, supplementary motor area impairment seems to play a central role in parkinsonism, in line with the brain reorganization of action-related tasks.