Browsing by Author "Özerdem, Ayşegül"
Now showing items 1-20 of 29
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Brain oscillations in bipolar disorder as emerging biomakers
Güntekin, Bahar; Özerdem, Ayşegül; Başar, Erol (Wiley-Blackwell, Commerce Place, 350 Main St, Malden 02148, Ma Usa, 2012-03) -
Brain oscillatory responses in patients with bipolar disorder manic episode before and after valproate treatment
Özerdem, Ayşegül; Güntekin, Bahar; Tunca, Zeliha; Başar, Erol (ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, 2008-10-15)Background: GABA/Glutamatergic dysfunction and neural circuits which regulate cognitive processing are involved in the underlying pathology of bipolar disorder. Event related oscillatory neuroelectrical activity reflects ... -
Brain's alpha activity is highly reduced in euthymic bipolar disorder patients
Başar, Erol; Güntekin, Bahar; Turp Gölbaşı, Bilge; Atagün, Murat İlhan; Özerdem, Ayşegül; Tülay, Elif (Springer, Van Godewijckstraat 30, 3311 Gz Dordrecht, Netherlands, 2012-02)Brain's alpha activity and alpha responses belong to major electrical signals that are related to sensory/cognitive signal processing. The present study aims to analyze the spontaneous alpha activity and visual evoked alpha ... -
Changes in brain oscillations and connectivity deficit in bipolar disorder
Güntekin, Bahar; Atagün, Murat İlhan; Özerdem, Ayşegül; Başar, Erol (Elsevier Science Bv, Po Box 211, 1000 Ae Amsterdam, Netherlands, 2012-09) -
Combined evaluation of oscillatory responses and memory performance in Bipolar disorder
Özerdem, Ayşegül; Akdede, Berna Binnur; Oğuz, Meral; Tunca, Zeliha; Başar, Erol (Elsevier Science Inc, 360 Park Ave South, New York, Ny 10010-1710 USA, 2009-04-15) -
Decrease of Alpha/Beta Ratio in EEG Activity in Drug Free Euthymic Bipolar Patients
Başar, Erol; Tülay, Elif; Özerdem, Ayşegül; Atagün, Murat İlhan; Güntekin, Bahar (Elsevier Science Inc, 360 Park Ave South, New York, Ny 10010-1710 Usa, 2012-04-15) -
Decrease of long distance event related gamma coherence in bipolar patients
Özerdem, Ayşegül; Güntekin, Bahar; Atagün, Murat İlhan; Turp, Bilge; Oral, Esat Timuçin; Başar, Erol (Elsevier Science Bv, Po Box 211, 1000 AE Amsterdam, Netherlands, 2010-09) -
Decrease of Long Distance Gamma (28-48 Hz) Coherence in Euthymic Drug Free Bipolar Patients upon Cognitive Load
Özerdem, Ayşegül; Güntekin, Bahar; Atagün, Murat İlhan; Turp, Bilge; Oral, Esat Timuçin; Başar, Erol (Elsevier Science Inc, 360 Park Ave South, New York, Ny 10010-1710 USA, 2010-05-01) -
Decrease of Theta Response in Euthymic Bipolar Patients During an Oddball Paradigm
Başar, Erol; Atagün, Murat İlhan; Güntekin, Bahar; Özerdem, Ayşegül; Tülay, Emine Elif (Springer, Van Godewijckstraat 30, 3311 Gz Dordrecht, Netherlands, 2013-06)Theta oscillations are related to cognitive functions and reflect functional integration of frontal and medial temporal structures into coherent neurocognitive networks. This study assessed event-related theta oscillations ... -
Decreased Evoked Right Fronto-Temporal Gamma Coherence in Acute Mania Improves After Valproate Monotherapy
Özerdem, Ayşegül; Güntekin, Bahar; Saatçı, Ertuğrul; Başar, Erol (Elsevier Science Inc, 360 Park Ave South, New York, Ny 10010-1710 USA, 2009-04-15) -
Disturbance In Long Distance Gamma Coherence In Bipolar Disorder
Özerdem, Ayşegül; Güntekin, Bahar; Saatçı, Ertuğrul; Tunca, Zeliha; Başar, Erol (Pergamon-Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington, Oxford Ox5 1Gb, England, 2010-08-16)The aim of this study was to investigate long distance event-related gamma (28-48 Hz) coherence in mania before and after valproate monotherapy. Gamma coherence in response to visual oddball paradigm in ten medication-free, ... -
Effect of valproate on oscillatory delta frequency responses to visual stimuli in a group of euthymic bipolar patients in comparison to healthy controls
Özerdem, Ayşegül; Kocaaslan, Sibel; Tunca, Zeliha; Başar, Erol (Elsevier Science Inc, 360 Park Ave South, New York, Ny 10010-1710 USA, 2007-04-15) -
Event Related Oscillations in Euthymic Patients With Bipolar Disorder
Özerdem, Ayşegül; Kocaaslan, Sibel; Tunca, Zeliha; Başar, Erol (ELSEVIER IRELAND LTD, ELSEVIER HOUSE, BROOKVALE PLAZA, EAST PARK SHANNON, CO, CLARE, 00000, IRELAND, 2008-10-17)Bipolar disorder involves dysfunction in gamma amino butyric acid (GABA)/glutamatergic systems and neural circuits that regulate cognitive processing. Valproate, a mood stabilizing anticonvulsant, modulates GABA/glutamate ... -
Evoked and Event Related Theta Oscillations are Decreased in Drug-Free Euthymic Bipolar Patients
Atagün, Murat İlhan; Özerdem, Ayşegül; Güntekin, Bahar; Başar, Erol (Elsevier Science Inc, 360 Park Ave South, New York, Ny 10010-1710 USA, 2011-05-01) -
Female vulnerability for thyroid function abnormality in bipolar disorder: role of lithium treatment
Özerdem, Ayşegül; Tunca, Zeliha; Çımrın, Dilek; Hıdıroğlu, Ceren; Ergör, Gül (Wiley, 111 River St, Hoboken 07030-5774, Nj Usa, 2014-02)BackgroundPrevious studies have provided evidence of subtle thyroid hormone metabolism abnormalities in patients with mood disorders. Although these studies are informative, the precise role of the hypothalamic-pituitary-thyroid ... -
High occipital beta (18-30 Hz) and low occipital alpha (8-13 Hz) oscillatory response to target visual stimuli in bipolar disorder reduce with chronic valproate use
Özerdem, Ayşegül; Güntekin, Bahar; Tunca, Zeliha; Başar, Erol (Elsevier Science Inc, 360 Park Ave South, New York, Ny 10010-1710 USA, 2008-04-01) -
Increase of Beta Response upon Application of Lithium in Euthymic Bipolar Patients
Tan, Devran; Özerdem, Ayşegül; Güntekin, Bahar; Atagün, Murat İlhan; Tülay, Elif; Karadağ, Figen; Başar, Erol (Elsevier Science Inc, 360 Park Ave South, New York, Ny 10010-1710 USA, 2011-05-01) -
Increased Beta Frequency (15-30 Hz) Oscillatory Responses in Euthymic Bipolar Patients Under Lithium Monotherapy
Tan, Devran; Özerdem, Ayşegül; Güntekin, Bahar; Atagün, Murat İlhan; Tülay, Elif; Karadağ, Figen; Başar, Erol (Sage Publications Inc, 2455 Teller Rd, Thousand Oaks, Ca 91320 USA, 2016-04)The effect of lithium on neurocognition is not still fully explored. Brain oscillatory activity is altered in bipolar disorder. We aimed to assess the oscillatory responses of euthymic bipolar patients and how they are ... -
Long distance gamma (28-48 Hz) coherence decreases under cognitive load in drug free euthymic patients with bipolar disorder
Özerdem, Ayşegül; Güntekin, Bahar; Atagün, Murat İlhan; Turp, Bilge; Oral, Esat Timuçin; Başar, Erol (Wiley-Blackwell Publishing, Inc, Commerce Place, 350 Main St, Malden 02148, Ma USA, 2010-03) -
Long-range evoked gamma coherence in acute mania before and after treatment: a sign for disturbed neural network connectivity
Özerdem, Ayşegül; Güntekin, Bahar; Ertuğrul Saatçı; Başar, Erol (Wiley-Blackwell Publishing, Inc, Commerce Place, 350 Main St, Malden 02148, Ma USA, 2009-06)