Now showing items 1-12 of 12

    • A New Interpretation Of P300 Responses Upon Analysis Of Coherences 

      Güntekin, Bahar; Başar, Erol (Springer, Van Godewijckstraat 30, 3311 Gz Dordrecht, Netherlands, 2010-06)
      Previous studies on cognitive dynamics showed that oscillatory responses of P300 are composed of mainly delta and theta responses. In the present study, for the first time, the long-distance intra-hemispheric event related ...
    • Auditory Delta Event-related Oscillatory Responses are Decreased in Alzheimer's Disease 

      Başar, Erol; Yener, Görsev; Güntekin, Bahar; Necioğlu Örken, Dilek; Forta, H. (Ios Press, Nieuwe Hemweg 6B, 1013 Bg Amsterdam, Netherlands, 2012)
      Background: Visual delta event-related (ERO) and evoked oscillations (EO) of Alzheimer patients (AD) are different than healthy. In the present study, the analysis is extented to include auditory ERO and EO in AD. The ...
    • Decrease of Delta Oscillatory Responses in Cognitively Normal Parkinson's Disease 

      Emek Savaş, Derya Durusu; Ozmus, Guelin; Güntekin, Bahar; Dönmez Çolakoğlu, Berril; Çakmur, Raif; Başar, Erol; Yener, Görsev G. (Sage Publications Inc, 2455 Teller Rd, Thousand Oaks, Ca 91320 USA, 2017-09)
      Parkinson's disease (PD) is a common progressive neurodegenerative disorder. This study aims to compare sensory-evoked oscillations (SEOs) and event-related oscillations (EROs) of visual modality in cognitively normal PD ...
    • Decrease of delta oscillatory responses is associated with increased age in healthy elderly 

      Emek Savaş, Derya Durusu; Güntekin, Bahar; Yener, Görsev G.; Başar, Erol (Elsevier Science Bv, Po Box 211, 1000 AE Amsterdam, Netherlands, 2016-05)
      Background: The purpose of this study was to investigate changes in delta event-related oscillations (EROs) in younger and older healthy elderly subjects. We hypothesized that delta EROs were affected by age-related changes, ...
    • Delay of cognitive gamma responses in Alzheimer's disease 

      Başar, Erol; Emek Savaş, Derya Durusu; Güntekin, Bahar; Yener, Görsev G. (Elsevier Sci Ltd, The Boulevard, Langford Lane, Kidlington, Oxford Ox5 1Gb, Oxon, England, 2016)
      Event-related oscillations (EROs) reflect cognitive brain dynamics, while sensory-evoked oscillations (SEOs) reflect sensory activities. Previous reports from our lab have shown that those with Alzheimer's disease (AD) or ...
    • Event-related delta oscillatory responses of Alzheimer patients 

      Yener, Görsev; Güntekin, Bahar; Başar, Erol (WILEY-BLACKWELL, COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA, 2008-06)
      Background and purpose: Alzheimer type of dementia (AD) is the most common neuropsychiatric morbidity in elderly individuals. Event-related oscillations (ERO) provide an useful tool for detecting subtle abnormalities of ...
    • Increased frontal phase-locking of event-related theta oscillations in Alzheimer patients treated with cholinesterase inhibitors 

      Yener, Görsev G.; Güntekin, Bahar; Öniz, Adile; Başar, Erol (ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, 2007-04)
      This is a pilot study describing event-related oscillations in patients with Alzheimer-type dementia (AD). Theta responses of 22 mild probable AD subjects according to NINCDS-ADRDA criteria (11 non-treated, 11 treated by ...
    • Links of consciousness, perception, and memory by means of delta oscillations of brain 

      Başar, Erol; Düzgün, Aysel (Frontiers Media Sa, Po Box 110, EPFL Innovation Park, Building I, Lausanne, 1015, Switzerland, 2016-03-10)
      The aim of this report is threefold: (1) First, we accomplish a survey integrating the description of consciousness, perception, and memory according to the views of descriptions of Hermann Helmholtz, Sigmund Freud, ...
    • Multiple gamma oscillations in the brain: A new strategy to differentiate functional correlates and P300 dynamics 

      Başar, Erol; Tülay, Elif; Güntekin, Bahar (Elsevıer Science Bv, Po Box 211, 1000 Ae Amsterdam, Netherlandi, 2015-03)
      Brain oscillations in the gamma frequency band, - i.e. oscillations greater than 25 Hz - have attracted increasing attention over the last few decades in the research of sensory-cognitive processes. In the neuroscience ...
    • Prolongation Of Alpha Oscillations İn Auditory Oddball Paradigm 

      Öniz, Adile; Başar, Erol (Elsevier Science Bv, Po Box 211, 1000 Ae Amsterdam, Netherlands, 2009-03)
      Although an important component of the P300 target response is the "prolonged alpha response". no relevant analysis is found in the literature. The present study emphasizes the relevance of prolongation of alpha responses ...
    • Sensory Evoked And Event Related Oscillations In Alzheimer's Disease: A Short Review 

      Yener, Görsev G.; Başar, Erol (Springer, Van Godewijckstraat 30, 3311 Gz Dordrecht, Netherlands, 2010)
      Diagnosis and treatment of Alzheimer's disease (AD) depend on clinical evaluation and there is a strong need for an objective tool as a biomarker. Our group has investigated brain oscillatory responses in a small group of ...
    • The visual cognitive network, but not the visual sensory network, is affected in amnestic mild cognitive impairment: A study of brain oscillatory responses 

      Yener, Görsev; Emek Savaş, Derya Durusu; Güntekin, Bahar; Başar, Erol (Elsevier Science Bv, Po Box 211, 1000 Ae Amsterdam, Netherlands, 2014-10-17)
      Mild Cognitive Impairment (MCI) is considered in many as prodromal stage of Alzheimer's disease (AD). Event-related oscillations (ERO) reflect cognitive responses of brain whereas sensory-evoked oscillations (SE) inform ...