نتایج جستجو برای: مؤلفه p300

تعداد نتایج: 16411  

دراین مقاله سیستمی مبتنی بر بازشناسی آماری الگو جهت تفکیک سیگنال‌های حاوی P300 و فاقد آن، ارائه می‌شود. این سیستم- که بر روی دادگان P300-Speller مسابقات BCI 2005 کار می‌کند- از چهار بخش اصلی پیش‌پردازش، استخراج ویژگی، انتخاب ویژگی و طبقه‍بند تشکیل شده که تأکید اصلی این مقاله بر بخش استخراج ویژگی و بررسی کارایی ویژگی‌های مختلف است. در مرحلة استخراج ویژگی، شش دسته ویژگی شامل قطعه‌بندی هوشمند، ضرا...

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...

ژورنال: :فصل نامه علمی پژوهشی مهندسی پزشکی زیستی 2011
زهرا امینی وحید ابوطالبی محمدتقی صادقی

دراین مقاله سیستمی مبتنی بر بازشناسی آماری الگو جهت تفکیک سیگنال­های حاوی p300 و فاقد آن، ارائه می شود. این سیستم- که بر روی دادگان p300-speller مسابقات bci 2005 کار می­کند- از چهار بخش اصلی پیش­پردازش، استخراج ویژگی، انتخاب ویژگی و طبقه‍بند تشکیل شده که تأکید اصلی این مقاله بر بخش استخراج ویژگی و بررسی کارایی ویژگی­های مختلف است. در مرحلة استخراج ویژگی، شش دسته ویژگی شامل قطعه­بندی هوشمند، ضرا...

Journal: :basic and clinical neuroscience 0
mohammad amin khoshlessan1 niavaran bldg., niavaran square, tehran, iran, p. o. box 19395-5746, tel: +98 21 2229 4035, fax: +98 21 2228 0352, email: [email protected] p300 & object color knowledge sadra sadeh medical school, iran university of medical sciences reza nilipour medical school, iran university of medical sciences, department of speech therapy, university of social welfare and rehabilitation sciences

a b s t r a c t introduction: in an oddball experiment, the context in which novel stimuli are presented affects characteristics of novelty p3, i.e. as long as there is a difficult task in which the difference between standard and target stimuli is small, recurrent presentation of a highly discrepant stimulus can lead to p300 highly similar to novelty p3. effect of stimulus properties on p300 h...

Journal: :The Journal of biological chemistry 2012
Ling He Karuna Naik Shumei Meng Jia Cao Aniket R Sidhaye Anlin Ma Sally Radovick Fredric E Wondisford

A major cause of fasting hyperglycemia in diabetes mellitus is unregulated hepatic glucose production (HGP). Insulin suppresses HGP by phosphorylating CBP and disassembling the CREB-CBP complex from gluconeogenic genes. p300 is closely related to CBP; but in contrast to CBP, p300 binds constitutively to CREB due to the absence of phosphorylation site found in CBP. In a phosphorylation-competent...

2013
Mandeep Kaur P. Ahmed Qasim Rafiq

This paper investigates P300 features extracted through wavelet transform for BCI systems. Feature extraction is one of the key issues of signal processing for P300 based brain-computer interface systems (BCI). This paper examines and highlights the significance of using wavelets in P300 based BCI systems. We also mention various methods of feature extraction from P300 signals. The analysis sug...

2014
Jasna Maksimoska Dario Segura-Peña Philip A. Cole Ronen Marmorstein

The p300 and CBP transcriptional coactivator paralogs (p300/CBP) regulate a variety of different cellular pathways, in part, by acetylating histones and more than 70 non-histone protein substrates. Mutation, chromosomal translocation, or other aberrant activities of p300/CBP are linked to many different diseases, including cancer. Because of its pleiotropic biological roles and connection to di...

Journal: :Neuroscience letters 2010
Hiroki Nakata Kiwako Sakamoto Ryusuke Kakigi

The present study investigated one of the characteristics of No-go-related brain activity during somatosensory Go/No-go paradigms, by manipulating the stimulus site and response hand. Somatosensory event-related potentials (ERPs) were recorded in ten right-handed subjects. Electrical stimulation was delivered to the second and fifth digit of one hand, and the subjects had to respond to a Go sti...

Journal: :Molecular and cellular biology 1997
S Mink B Haenig K H Klempnauer

Transcriptional coactivators such as p300 and CREB-binding protein (CBP) function as important elements in the transcription factor network, linking individual transactivators via protein-protein interactions to the basal transcriptional machinery. We have investigated whether p300 plays a role in transactivation mediated by C/EBPbeta, a conserved member of the C/EBP family. We show that C/EBPb...

Journal: :American journal of physiology. Endocrinology and metabolism 2010
Shali Chen Biao Feng Biju George Rana Chakrabarti Megan Chen Subrata Chakrabarti

Sustained hyperglycemia in diabetes causes alteration of a large number of transcription factors and mRNA transcripts, leading to tissue damage. We investigated whether p300, a transcriptional coactivator with histone acetyl transferase activity, regulates glucose-induced activation of transcription factors and subsequent upregulation of vasoactive factors and extracellular matrix (ECM) protein...

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