Browsing by Author "Aktürk, Tuba"
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Abnormalities in auditory and visual cognitive processes are differentiated with theta responses in patients with Parkinson's disease with and without dementia
Güntekin, Bahar; Aktürk, Tuba; Yıldırım, Ebru; Helvacı Yılmaz, Nesrin; Hanoğlu, Lütfü; Yener, Görsev (Elsevier, 2020)The research on the abnormalities of event-related oscillations in Parkinson's disease (PD) was mostly studied with cognitively normal patients. The present study aims to show the adverse effects of cognitive decline in ... -
Abnormalities of cortical sources of resting state alpha electroencephalographic rhythms are related to education attainment in cognitively unimpaired seniors and patients with alzheimer's disease and amnesic mild cognitive impairment
Babiloni, Claudio C.; Ferri, Raffaele; Noce, Giuseppe; Lizio, Roberta; Lopez, Susanna; Lorenzo, Ivan; Panzavolta, Andrea; Soricelli, Andrea; Nobili, Flavio Mariano; Arnaldi, Dario; Famà, Francesco; Orzi, Francesco; Buttinelli, Carla; Giubilei, Franco; Cipollini, Virginia; Marizzoni, Moira; Güntekin, Bahar; Aktürk, Tuba; Hanoǧlu, Lütfü; Yener, Görsev G.; Özbek, Yağmur; Stocchi, Fabrizio; Vacca, Laura; Frisoni, Glovannl B.; del Percio, Claudio (NLM (Medline), 2021)In normal old (Nold) and Alzheimer's disease (AD) persons, a high cognitive reserve (CR) makes them more resistant and resilient to brain neuropathology and neurodegeneration. Here, we tested whether these effects may ... -
Age related differences in the recognition of facial expression: Evidence from EEG event-related brain oscillations
Aktürk, Tuba; İşoğlu-Alkaç, Ümmühan; Hanoǧlu, Lütfü; Güntekin, Bahar (Elsevier B.V., 2020)Facial Expression (FE) recognition is a major marker of emotional ability. Behavioral studies show that FE recognition ability decreases with aging. Studying how event-related brain oscillations change with normal aging ... -
Are there consistent abnormalities in event-related EEG oscillations in patients with Alzheimer's disease compared to other diseases belonging to dementia?
Güntekin, Bahar; Aktürk, Tuba; Arakaki, Xianghong; Bonanni, Laura; Del Percio, Claudio; Edelmayer, Rebecca; Farina, Francesca; Ferri, Raffaele; Hanoğlu, Lütfü; Kumar, Sanjeev; Lizio, Roberta; Lopez, Susanna; Murphy, Brian; Noce, Giuseppe; Randall, Fiona; Sack, Alexander T.; Stocchi, Fabrizio; Yener, Görsev; Yıldırım, Ebru; Babiloni, Claudio (John Wiley and Sons Inc, 2022)Cerebrospinal and structural-molecular neuroimaging in-vivo biomarkers are recommended for diagnostic purposes in Alzheimer’s disease (AD) and other dementias; however, they do not explain the effects of AD neuropathology ... -
Cognitive impairment in parkinson's disease is reflected with gradual decrease of eeg delta responses during auditory discrimination
Güntekin, Bahar; Hanoğlu, Lütfü; Güner, Dilan; Helvacı Yılmaz, Nesrin; Çadırcı, Fadime; Mantar, Nagihan; Aktürk, Tuba; Emek Savaş, Derya Durusu; Özer, Feriha; Yener, Görsev; Başar, Erol (Frontiers Media Sa, 2018)Parkinson's disease (PD) is a neurodegenerative disease that is characterized by loss of dopaminergic neurons in the substantia nigra. Mild Cognitive impairment (MCI) and dementia may come along with the disease. New ... -
Comparison of the visual and auditory event related potentials of parkinson's disease epatients with and without cognitive impairment
Güner, Dilan; İsogğlu Alkaç, Ümmühan; Aktürk, Tuba; Hanoğlu, Lütfü; Güntekin, Bahar (Wiley, 2017)Auditory event related potentials (ERPs) and visual evoked potentials (VEPs) were recorded from eight patients with Parkinson's disease, before and after a single dose of apomorphine. To assess the treatment effects, the ... -
Delta oscillatory responses as a general electrophysiological biomarker for cognitive disorders
Güntekin, Bahar; Hanoğlu, Lütfü; Aktürk, Tuba; Güner, Dilan; Turp-Gölbaşı, Bilge; Yener, Görsev; Başar, Erol (Elsevier Science Bv, 2016)Background: In the last decade research on delta oscillatoryresponses invaded the literature. One of thefirst research on thisarea showed that delta responses increase upon cognitive load(Başar and Stampfer 1985). After ... -
The difference of mild cognitive impairment in Parkinson's disease from amnestic mild cognitive impairment: Deeper power decrement and no phase-locking in visual event-related responses
Yener, Görsev G.; Fide, Ezgi; Özbek, Yağmur; Emek Savaş, Derya Durusu; Aktürk, Tuba; Çakmur, Raif; Güntekin, Bahar (Elsevier Science Bv, 2019)Event-related oscillatory responses reflect the cognitive status in many neuropsychiatric conditions including mild cognitive impairment (MCI). In this study, a total of 30 patients with amnestic MCI (aMCI) and 25 patients ... -
Electrophysiological evidence of altered facial expressions recognition in Alzheimer's disease: A comprehensive ERP study
Fide, Ezgi; Ekmek Savaş, Derya Durusu; Aktürk, Tuba; Güntekin, Bahar; Hanoğlu, Lütfü; Yener, Görsev G. (Elsevier Ireland Ltd, 2019)Objectives: The present study aims to evaluate the amplitude and latency of event-related potentials (ERPs) P100, N170, VPP and N230 in individuals with Alzheimer's disease (AD) compared to healthy elderly controls, using ... -
Enhancing memory capacity by experimentally slowing theta frequency oscillations using combined EEG-tACS
Aktürk, Tuba; de Graaf, Tom A.; Güntekin, Bahar; Hanoğlu, Lütfü; Sack, Alexander T. (Nature Portfolio, 2022)he coupling of gamma oscillation (similar to 40+ Hz) amplitude to the phase of ongoing theta (similar to 6 Hz) oscillations has been proposed to be directly relevant for memory performance. Current theories suggest that ... -
Event-related EEG oscillatory responses elicited by dynamic facial expression
Aktürk, Tuba; de Graaf, Tom A.; Abra, Yasemin; Şahoğlu Göktaş, Sevilay; Özkan, Dilek; Kula, Aysun; Güntekin, Bahar (BMC, 2021)Background Recognition of facial expressions (FEs) plays a crucial role in social interactions. Most studies on FE recognition use static (image) stimuli, even though real-life FEs are dynamic. FE processing is complex and ... -
Impairment in recognition of emotional facial expressions in Alzheimer's disease is represented by EEG theta and alpha responses
Güntekin, Bahar; Hanoǧlu, Lütfü; Aktürk, Tuba; Ruşen, Ece; Yıldırım, Ebru; Yener, Görsev (Blackwell Publishing Inc., 2019)Behavioral studies have shown that the recognition of facial expressions may be impaired in patients with Alzheimer's disease (AD). The identification and recognition of a facial expression might be represented by event-related ... -
Oscillatory delta and theta frequencies differentially support multiple items encoding to optimize memory performance during the digit span task
Aktürk, Tuba; de Graaf, Tom A.; Erdal, Furkan; Sack, Alexander T.; Güntekin, Bahar (Academic Press Inc., 2022)The human brain has limited storage capacity often challenging the encoding and recall of a long series of multiple items. Different encoding strategies are therefore employed to optimize performance in memory processes ... -
Resting state alpha electroencephalographic rhythms are differently related to aging in cognitively unimpaired seniors and patients with alzheimer's disease and amnesic mild cognitive impairment
Babiloni, Claudio; Ferri, Raffaele; Noce, Giuseppe; Lizio, Roberta; Lopez, Susanna; Lorenzo, Ivan; Tucci, Federico; Soricelli, Andrea; Nobili, Flavio; Arnaldi, Dario; Fama, Francesco; Orzi, Francesco; Buttinelli, Carla; Giubilei, Franco; Cipollini, Virginia; Marizzoni, Moira; Güntekin, Bahar; Aktürk, Tuba; Hanoğlu, Lütfü; Yener, Görsev; Özbek, Yağmur; Stocchi, Fabrizio; Vacca, Laura; Frisoni, Giovanni B.; del Percio, Claudio (IOS Press, 2021)Background: In relaxed adults, staying in quiet wakefulness at eyes closed is related to the so-called resting state electroencephalographic (rsEEG) rhythms, showing the highest amplitude in posterior areas at alpha ... -
Resting-state electroencephalographic delta rhythms may reflect global cortical arousal in healthy old seniors and patients with Alzheimer's disease dementia
Babiloni, Claudio; Ferri, Raffaele; Noce, Giuseppe; Lizio, Roberta; Lopez, Susanna; Soricelli, Andrea; Nobili, Flavio; Arnaldi, Dario; Fama, Francesco; Orzi, Francesco; Buttinelli, Carla; Giubilei, Franco; Cipollini, Virginia; Marizzoni, Moira; Güntekin, Bahar; Aktürk, Tuba; Hanoğlu, Lütfü; Yener, Görsev; Emek Savaş, Derya Durusu; Stocchi, Fabrizio; Vacca, Laura; Frisoni, Giovanni B.; Del Percio, Claudio (Elsevier, 2020)Extending Basar's theory of event-related EEG oscillations, here we hypothesize that even in quiet wakefulness, transient increases in delta rhythms may enhance global cortical arousal as revealed by the desynchronization ...
