oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Correlation analysis of the long latency auditory evoked potential N2 and cognitive P3 with the level of lead poisoning in children
Alvarenga, Kátia de Freitas;Bernardez-Braga, Gabriela Rosito Alvarez;Zucki, Fernanda;Duarte, Josilene Luciene;Lopes, Andrea Cintra;Feniman, Mariza Ribeiro;
International Archives of Otorhinolaryngology , 2013, DOI: 10.7162/S1809-97772013000100007
Abstract: introduction: the effects of lead on children's health have been widely studied. aim: to analyze the correlation between the long latency auditory evoked potential n2 and cognitive p3 with the level of lead poisoning in brazilian children. methods: this retrospective study evaluated 20 children ranging in age from 7 to 14 years at the time of audiological and electrophysiological evaluations. we performed periodic surveys of the lead concentration in the blood and basic audiological evaluations. furthermore, we studied the auditory evoked potential long latency n2 and cognitive p3 by analyzing the absolute latency of the n2 and p3 potentials and the p3 amplitude recorded at cz. at the time of audiological and electrophysiological evaluations, the average concentration of lead in the blood was less than 10 ug/dl. results: in conventional audiologic evaluations, all children had hearing thresholds below 20 dbhl for the frequencies tested and normal tympanometry findings; the auditory evoked potential long latency n2 and cognitive p3 were present in 95% of children. no significant correlations were found between the blood lead concentration and latency (p = 0.821) or amplitude (p = 0.411) of the p3 potential. however, the latency of the n2 potential increased with the concentration of lead in the blood, with a significant correlation (p = 0.030). conclusion: among brazilian children with low lead exposure, a significant correlation was found between blood lead levels and the average latency of the auditory evoked potential long latency n2; however, a significant correlation was not observed for the amplitude and latency of the cognitive potential p3.
Correlation analysis of the long latency auditory evoked potential N2 and cognitive P3 with the level of lead poisoning in children  [cached]
Alvarenga, Kátia de Freitas,Bernardez-Braga, Gabriela Rosito Alvarez,Zucki, Fernanda,Duarte, Josilene Luciene
International Archives of Otorhinolaryngology , 2013,
Abstract: Introduction: The effects of lead on children's health have been widely studied. Aim: To analyze the correlation between the long latency auditory evoked potential N2 and cognitive P3 with the level of lead poisoning in Brazilian children. Methods: This retrospective study evaluated 20 children ranging in age from 7 to 14 years at the time of audiological and electrophysiological evaluations. We performed periodic surveys of the lead concentration in the blood and basic audiological evaluations. Furthermore, we studied the auditory evoked potential long latency N2 and cognitive P3 by analyzing the absolute latency of the N2 and P3 potentials and the P3 amplitude recorded at Cz. At the time of audiological and electrophysiological evaluations, the average concentration of lead in the blood was less than 10 ug/dL. Results: In conventional audiologic evaluations, all children had hearing thresholds below 20 dBHL for the frequencies tested and normal tympanometry findings; the auditory evoked potential long latency N2 and cognitive P3 were present in 95% of children. No significant correlations were found between the blood lead concentration and latency (p = 0.821) or amplitude (p = 0.411) of the P3 potential. However, the latency of the N2 potential increased with the concentration of lead in the blood, with a significant correlation (p = 0.030). Conclusion: Among Brazilian children with low lead exposure, a significant correlation was found between blood lead levels and the average latency of the auditory evoked potential long latency N2; however, a significant correlation was not observed for the amplitude and latency of the cognitive potential P3.
Ern hrung bei Kleinkindern: Empfehlungen und Ern hrungspraxis
Kersting M,Hilbig A
Journal für Ern?hrungsmedizin , 2012,
Abstract: W hrend die Ern hrung von S uglingen schon immer ein zentrales Thema der p diatrischen Ern hrungsmedizin war, und es auch für die Ern hrung von Kindern und Jugendlichen gut begründete Ern hrungsempfehlungen gibt, ist die Ern hrung von Kleinkindern im Alter von 1 bis 3 Jahren in der P diatrie und Ern hrungswissenschaft erst in letzter Zeit auch in den deutschsprachigen L ndern zum Thema geworden [1-4].
Ern hrungssituation von Kleinkindern  [PDF]
Veitl V
Journal für Ern?hrungsmedizin , 2006,
Abstract: S uglings- und Kleinkindesalter sind für Wachstum und Entwicklung vulnerable Lebensphasen, die sehr stark von der Ern hrung beeinflusst werden k nnen. S uglingsern hrungsrichtlinien sind wissenschaftlich gesichert, gut bekannt und akzeptiert. Für die Ern hrung nach dem ersten Lebensjahr gibt es nur pauschale Empfehlung für die Einführung der Familienkost. Für eine optimale Entwicklung ist auch noch im Kleinkindalter eine optimale kleinkindgerechte Ern hrung erforderlich. Nach Verzehrserhebungen bei sterreichischen Kleinkindern im Alter von 12 bis 36 Monaten ergibt sich nach Angaben der Mütter für einen Gro teil ihrer Kleinkinder keine ern hrungsphysiologisch zufriedenstellende Ern hrungssituation. Einerseits besteht für einige N hrstoffe eine exzessive überversorgung und andererseits auch eine Unterversorgung für einen Gro teil der Kinder.Im Sinne einer prim ren Pr vention, die Kinder rzte auch als ihre wesentliche Aufgabe betrachten, sollte die gezielte Ern hrungsberatung zur Kleinkinderern hrung für Mütter mit lteren S uglingen durchgeführt werden.
Temporospatial dissociation of Pe subcomponents for perceived and unperceived errors  [PDF]
Tanja Endrass,Julia Klawohn,Julia Preuss,Norbert Kathmann
Frontiers in Human Neuroscience , 2012, DOI: 10.3389/fnhum.2012.00178
Abstract: Previous research on performance monitoring revealed that errors are followed by an initial fronto-central negative deflection (error-related negativity, ERN or Ne) and a subsequent centro-parietal positivity (error positivity, Pe). It has been shown that error awareness mainly influences the Pe, whereas the ERN seems unaffected by conscious awareness of an error. The aim of the present study was to investigate the relation of ERN and Pe to error awareness in a visual size discrimination task in which errors are not elicited by impulsive responding but by perceptual difficulty. Further, we applied a temporospatial principal component analysis (PCA) to examine whether the temporospatial subcomponents of the Pe would differentially relate to error awareness. Event-related potential (ERP) results were in accordance with earlier studies: a significant error awareness effect was found for the Pe, but not for the ERN. Interestingly, a modulation with error perception on correct trials was found: correct responses considered as incorrect had larger correct-related negativity (CRN) and lager Pe amplitudes than correct responses considered as correct. The PCA yielded two relevant spatial factors accounting for the Pe (latency 300 ms). A temporospatial factor characterized by a centro-parietal positivity varied significantly with error awareness. Of the two temporospatial factors corresponding to ERN and CRN, one factor with central topography varied with response correctness and subjective error perception on correct responses. The PCA results indicate that the error awareness effect is specifically related to the centro-parietal subcomponent of the Pe. Since this component has also been shown to be related to the importance of an error, the present variation with error awareness indicates that this component is sensitive to the salience of an error and that salience secondarily may trigger error awareness.
Ern hrungstherapie bei Schluckst rungen
Schatzberger I
Journal für Ern?hrungsmedizin , 2002,
Abstract: Um die M glichkeit einer optimalen Ern hrung bieten zu k nnen, bedarf es einer interdisziplin ren Zusammenarbeit von rzten, Pflegedienst, dipl. Logop dInnen und dipl. Di tassistentInnen & ern hrungsmedizinischen BeraterInnen. Nach abgeschlossener Vordiagnostik ist ein individueller Ern hrungsplan zu erstellen. Die N hrstoffzufuhr sollte dabei den ern hrungsphysiologischen Kriterien hinsichtlich Energiezufuhr, Eiwei , Fett, Kohlenhydrate, Vitamine, Mineralstoffe, Spurenelemente und Flüssigkeitszufuhr entsprechen.
Ern hrungsmanagement bei Wundpatienten  [PDF]
Benedikt MA,Weitgasser R
Journal für Ern?hrungsmedizin , 2006,
Abstract: Ern hrung sollte als Teil der gesamt-medizinischen Therapie chronischer Wunden betrachtet werden. Ein frühzeitig eingesetztes Behandlungskonzept für Patienten mit Wundheilungsst rungen kann einerseits L sionen verhindern und andererseits eine raschere Abheilung bestehender Wunden unterstützen. Mittels überprüfung und Beurteilung des Ern hrungszustandes kann eine Mangelern hrung rasch erkannt und verhindert werden. Die Ern hrungstherapie muss dem jeweiligen Patienten angepasst sein und kann in Form natürlicher oder "künstlicher" Nahrung eingesetzt werden. Eine ausgeglichene Mischkost unter Einbeziehung von potentiell unterstützenden N hrsubstraten kann dabei von essenzieller Bedeutung sein.
Ern hrungstherapie bei Diarrhoe  [PDF]
Kührner S
Journal für Ern?hrungsmedizin , 2002,
Abstract: Unter Diarrhoe versteht man mehr als 3 konsistenzverminderte, flüssige Stuhlentleerungen pro Tag sowie eine vermehrte Stuhlmenge - zu h ufig, zu flüssig, zu viel. Nach rztlicher Abkl rung der Diarrhoe kann eine ad quate Ern hrungstherapie stattfinden.
Ern hrungstherapie bei Demenz  [PDF]
Rosenkranz G
Journal für Ern?hrungsmedizin , 2002,
Abstract: Viele Studien belegen, da Gewichtsverlust und Alzheimer-Krankheit (AD) in engem Zusammenhang stehen. Barrett-Connor et al. konnten aufzeigen, da der Diagnose einer AD oftmals ein Gewichtsverlust vorausgeht. AD dürfte somit auch durch eine Dysfunktion der zentralen Regulation des K rpergewichts charakterisiert sein. Für eine einfache und schnelle Ermittlung des Ern hrungszustandes eignet sich das Mini Nutritional Assessment (MNA ). Mittels Punktesystem werden die untersuchten Personen 3 Kategorien zugeordnet, welche spezifische ern hrungstherapeutische Notwendigkeiten aufweisen.
The Fixation and Saccade P3  [PDF]
Sangita Dandekar,Jian Ding,Claudio Privitera,Thom Carney,Stanley A. Klein
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0048761
Abstract: Although most instances of object recognition during natural viewing occur in the presence of saccades, the neural correlates of objection recognition have almost exclusively been examined during fixation. Recent studies have indicated that there are post-saccadic modulations of neural activity immediately following eye movement landing; however, whether post-saccadic modulations affect relatively late occurring cognitive components such as the P3 has not been explored. The P3 as conventionally measured at fixation is commonly used in brain computer interfaces, hence characterizing the post-saccadic P3 could aid in the development of improved brain computer interfaces that allow for eye movements. In this study, the P3 observed after saccadic landing was compared to the P3 measured at fixation. No significant differences in P3 start time, temporal persistence, or amplitude were found between fixation and saccade trials. Importantly, sensory neural responses canceled in the target minus distracter comparisons used to identify the P3. Our results indicate that relatively late occurring cognitive neural components such as the P3 are likely less sensitive to post saccadic modulations than sensory neural components and other neural activity occurring shortly after eye movement landing. Furthermore, due to the similarity of the fixation and saccade P3, we conclude that the P3 following saccadic landing could possibly be used as a viable signal in brain computer interfaces allowing for eye movements.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.