Search results for " brain"

DIFFERENT FORMS OF DYSGRAPHIA IN BRAIN-DAMAGED PATIENTS

2012

Normally a neurological accident (stroke, head injury, degenerative processes, tumour) to the left hemisphere produces disor- of linguistic functions (aphasia). Among these deficits, the comprehension (reading) and production (spelling) of written lan- guage are frequently altered. In this communication will be described the different types of acquired dysgraphia following a cerebral damage. A cognitive model of the spelling system is reported to explain the different level of processing that can be impaired. The aim is to highlight the complexity of the different clinical pictures that the dysgraphic patients can to show: indeed a careful diagno- sis on damaged cognitive functions and proc…

Rapid neural encoding of the contrast between native and nonnative speech in the alpha band

2021

AbstractMore than half of the world’s population is multilingual, yet it is not known how the human brain encodes the perception of native vs. nonnative speech. To find out, we asked German native speakers to detect the onset of native and nonnative (English and Turkish) vowels in a roving standard stimulation. Using EEG, we show that nonnativeness is robustly registered by an increase in phase coherence in the alpha band (8-12 Hz), beginning as early as ∼100 ms after stimulus onset and lasting more than 200 ms. The alpha band effect is speech-specific, successfully predicts the response speed advantage of nonnative speech, and grants ∼90% decoding accuracy in distinguishing native vs. nonn…

Removing ocular artifacts from magnetoencephalographic data on naturalistic reading of continuous texts

2022

Naturalistic reading paradigms and stimuli consisting of long continuous texts are essential for characterizing the cortical basis of reading. Due to the highly dynamic nature of the reading process, electrophysiological brain imaging methods with high spatial and temporal resolution, such as magnetoencephalography (MEG), are ideal for tracking them. However, as electrophysiological recordings are sensitive to electromagnetic artifacts, data recorded during naturalistic reading is confounded by ocular artifacts. In this study, we evaluate two different pipelines for removing ocular artifacts from MEG data collected during continuous, naturalistic reading, with the focus on saccades and blin…

2013

Following traumatic brain injury (TBI) neuroinflammatory processes promote neuronal cell loss. Alpha-melanocyte-stimulating hormone (α-MSH) is a neuropeptide with immunomodulatory properties, which may offer neuroprotection. Due to short half-life and pigmentary side-effects of α-MSH, the C-terminal tripeptide α-MSH(11–13) may be an anti-inflammatory alternative. The present study investigated the mRNA concentrations of the precursor hormone proopiomelanocortin (POMC) and of melanocortin receptors 1 and 4 (MC1R/MC4R) in naive mice and 15 min, 6, 12, 24, and 48 h after controlled cortical impact (CCI). Regulation of POMC and MC4R expression did not change after trauma, while MC1R levels incr…

Feasibility in routine clinical setting of combined resting-state fMRI and DTI-tractography for surgical planning of brain tumors

2020

Purpose Methods and materials Results Conclusion Personal information and conflict of interest References

Brain Monitoring Via an Innovative CW-FNIRS System

2015

Functional Near InfraRed Spectroscopy (fNIRS) is an imaging technique mainly devoted to human brain monitoring. It is used as a non-invasive technique, in medical field, in order to measure the oxygen concentration of blood. This because the relatively good transparency of biological materials in the near infrared allows sufficient photon transmission through tissues. Within the so-called fNIRS range (650-900 nm), the main absorbers are blood chromophores, in particular the oxygenated and deoxygenated haemoglobin (HbO2 and Hb, respectively). When two or more wavelengths are used, changes of such chromophores can be computed by employing the modified Beer-Lambert law, thus providing importan…

Does Bacillus thuringiensis Affect the Stress and Immune Responses of Rhynchophorus ferrugineus Larvae, Females, and Males in the Same Way?

2022

Simple Summary Rhynchophorus ferrugineus is a destructive quarantine pest of palm trees, now widely distributed. Although broad-spectrum insecticides are often used to protect palm against R. ferrugineus, there is increasing concern about their effects on the environment and human health, especially where palm trees are located in urban areas. As an environmentally friendly entomopathogen, Bacillus thuringiensis (Bt) has been widely used to prevent other pest infestations. Although Bt products are the most sold bio-insecticides, there are still many interesting features to be investigated in the relationship of Bt and its hosts. We investigated the effect of Bt on larvae, females, and males…

O Brasil na rota das migrações internacionais qualificadas espanholas no século XXI

2018

In order to understand recent migration, it is crucial to analyze the migratory modalities such as skilled international migration to Brazil, especially considering the ongoing transnational economic processes and their effects on the corresponding societies. Therefore, this article seeks to understand how the migratory dynamics of highly skilled Spanish professionals to the country are established taking into account the theoretical contribution of the circulation of brains and the category of knowledge workers. For this purpose, information from Brazilian?s Ministry of Labor is used on labor authorizations, financial contributions and insertion in the formal market in Spain; as well as da…

BRAIN DRAIN MIGRATION TYPE. WHAT CAUSES BRAIN DRAIN PHENOMENON?

2015

The phenomenon of migration of intellectuals, also known as "brain drain", we mean that constant transfer of highly qualified persons, especially in generally into less developed countries, to those states that have a developed economy. Most often, aspects of the social environment of home country, are the triggering factor in the migration decision intellectuals. Reducing the negative impact of brain drain can be achieved through the transfer of "know-how" through collaboration between intellectuals in the Diaspora with those of the country of origin in some projects.

Exercise and lactate production:implication in fatigue and in brain signaling

2016

More than two hundred years after its discovery, lactate still remains an intriguing molecule. Considered for a long time as a waste product of metabolism and the culprit behind muscular fatigue, it was then recognized as an important fuel for many cells. In particular, in the nervous system, it has been proposed that lactate, released by astrocytes in response to neuronal activation, is taken up by neurons, oxidized to pyruvate and used for synthesizing acetyl-CoA to be used for the tricarboxylic acid cycle. More recently, in addition to this metabolic role, the discovery of a specific receptor prompted a reconsideration of its role, and lactate is now seen as a sort of hormone, even invol…