نتایج جستجو برای: P300 Potential

تعداد نتایج: 1072470  

Journal: :auditory and vestibular research 0
sirvan najafi department of audiology, school of rehabilitation sciences, iran university of medical sciences, tehran, iran masoumeh rouzbahani department of audiology, school of rehabilitation sciences, iran university of medical sciences, tehran, iran fatemeh heidari department of audiology, school of rehabilitation, shahid beheshti university of medical sciences, tehran, iran agha fatemeh hosseini department of biostatistics, school of public health, iran university of medical sciences, tehran, iran

background and aim: auditory p300 is an event-related potential. cognitive factors like attention are involved in the generation of p300. it seems that normative variation of p300 is necessary for clinical purposes. thus, the current study was designed to establish preliminary normative variation of p300 amplitude and latency at fz and cz sites in adults. methods: this cross-sectional study was...

Ali Rastjoo Ardakani Hossein Arabalibeik,

Introduction: Evoked potentials arisen by stimulating the brain can be utilized as a communication tool  between humans and machines. Most brain-computer interface (BCI) systems use the P300 component,  which is an evoked potential. In this paper, we evaluate the use of the hidden Markov model (HMM) for  detection of P300.  Materials and Methods: The wavelet transforms, wavelet-enhanced indepen...

Journal: :iranian journal of medical physics 0
ali rastjoo ardakani msc in medical engineering, medical physics and medical engineering dept., faculty of medicine, tehran university of medical sciences, tehran, iran hossein arabalibeik assistant professor, medical physics and medical engineering dept., faculty of medicine, tehran university of medical sciences, tehran, iran

introduction: evoked potentials arisen by stimulating the brain can be utilized as a communication tool  between humans and machines. most brain-computer interface (bci) systems use the p300 component,  which is an evoked potential. in this paper, we evaluate the use of the hidden markov model (hmm) for  detection of p300.  materials and methods: the wavelet transforms, wavelet-enhanced indepen...

Abstract P300 is known as the most prominent component between cognitive components in electrical brain activity. According to done research, when brain encounters an inconsistent stimulation during processing a series of usual stimulation, a P300 component appears in recorded brain signal which could distinguishes from usual ones. Amplitude of P300 decreases after a short during act of auditor...

2012
Reza Fazel-Rezai Brendan Z. Allison Christoph Guger Eric W. Sellers Sonja C. Kleih Andrea Kübler

A brain-computer interface (BCI) enables communication without movement based on brain signals measured with electroencephalography (EEG). BCIs usually rely on one of three types of signals: the P300 and other components of the event-related potential (ERP), steady state visual evoked potential (SSVEP), or event related desynchronization (ERD). Although P300 BCIs were introduced over twenty yea...

Journal: :BMC Psychiatry 2007
Bernhard W Müller Michael Specka Nicolai Steinchen Dieter Zerbin Ernst Lodemann Thomas Finkbeiner Norbert Scherbaum

BACKGROUND The P300 component of the auditory evoked potential is an indicator of attention dependent target processing. Only a few studies have assessed cognitive function in substituted opiate addicts by means of evoked potential recordings. In addition, P300 data suggest that chronic nicotine use reduces P300 amplitudes. While nicotine and opiate effects combine in addicted subjects, here we...

Journal: :J. Inform. and Commun. Convergence Engineering 2011
Yun Seok Jang Soo-Ah Ryu Kyu-Chil Park

125 Abstract— P300 component of the event-related brain potential (ERP) reflects fundamental cognitive processes. The P300 components have been employed in a wide variety of theoretical, empirical, and clinical applications. In oddball paradigm for eliciting P300, we need standard stimuli and target stimuli. Firstly, designated stimuli are presented to subjects. Nextly, a chosen target stimulus...

2000
R. Singh R. Shukla P.K. Dalal P.K. Sinha J.K. Trivedi

P300 component of the event related potential (ERP) provides one neurophysiological index of cognitive dysfunction in depression. Forty subjects fulfilling DSM-III criteria for depression were compared to 40 age and sex matched normal controls. The P300 was recorded using the auditory odd-ball paradigm. Depressives had a significantly prolonged P300 latency and reduced P300 amplitude as compare...

Journal: :Cancer research 2005
Qingdong Deng Yilei Li Donato Tedesco Rong Liao Gerhard Fuhrmann Peiqing Sun

In primary cells, oncogenic ras induces a stable growth arrest known as premature senescence. Ras-induced premature senescence is considered as a tumor-suppressing defense response that needs to be bypassed before oncogenic potential ras can be revealed. To gain insights into the mechanism of senescence bypass during oncogenic transformation, we dissected the activities of an adenoviral oncopro...

2010
Alexandra Pentaraki Daniel Stahl Elvira Bramon Eugenia Kravariti Robin Murray Timothea Toulopoulou

Background Patients with schizophrenia and their unaffected relatives exhibit significant P300 amplitude and latency abnormalities in conjunction with neurocognitive deficits. Both the deficits in the P300 and neurocognition suggest that these indexes may be potential endophenotypes of the disorder. Few studies have examined the relationship between the P300 and neuropsychological measurements ...

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