Küçük, Kurtulus Mert

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https://hdl.handle.net/20.500.14365/7490
Name Variants
Kucuk, K. M.
Kuecuek, K. M.
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09. Faculty of Medicine
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Former Staff
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Scopus Author ID
57986245500
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3

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6

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Scholarly Output

5

Articles

3

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0

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WoS Citation Count

6

Scopus Citation Count

6

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2

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2

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0

WoS Citations per Publication

1.20

Scopus Citations per Publication

1.20

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1

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0

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Clınıcal Eeg And Neuroscıence1
Frontiers in Aging Neuroscience1
International Journal of Psychophysiology1
Internatıonal Journal of Psychophysıology1
Psychophysıology1
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Now showing 1 - 5 of 5
  • Thumbnail Image
    Conference Object
    Theta and Gamma Oscillations During Sustained Attention To Response Task (sart)
    (Elsevier, 2023) Ulgen, Z.; Kucuk, K. M.; Schmiedt-Fehr, C.; Guducu, C.; Başar Eroğlu, Canan
    [No abtract available]
  • Thumbnail Image
    Article
    Citation - WoS: 2
    Citation - Scopus: 2
    Aging Attenuated Theta Response During Multistable Perception
    (Wiley, 2023) Küçük, Kurtulus Mert; Mathes, Birgit; Schmiedt-Fehr, Christina; Başar Eroğlu, Canan
    Multistable stimuli are physically unchanging, but elicit spontaneous perceptual reversals between multiple internally generated perceptual alternatives. Perceptual reversal rates seem to decrease in older adults; however, there is no literature on the electrophysiological correlates of this performance decrease. Here, we aimed to identify age-related changes in theta activity that relate to decreased reversal rates of older adults. Electroencephalography (EEG) of young (n = 15) and older adults (n = 15) was recorded during presentation of stroboscopic alternative motion (SAM) and a control stimulus. Time-frequency amplitudes were extracted in 4-8 Hz via Morlet wavelet convolution. Older adults had lower SAM reversals as well as decreased accuracy, increased reaction time (RT) and increased RT variability in the control task. In older adults, reversal-related frontal theta response was diminished, yet parietal theta was intact. In the parietal area, the relationship between theta response and reversal rates was robust, but in the frontal area, was dependent on age-related variance. Result indicated that, in older adults, top-down facilitation of perceptual reversals was impaired. This appears to result in a predominantly bottom-up resolution of perceptual multistability. Age-related degradation of sensory areas in this bottom-up-driven resolution process might have slowed reversals. This study presents the first electrophysiological correlates of age-related impairment in multistable perceptual integration.
  • Thumbnail Image
    Article
    Multistable Perception Elicits Compensatory Alpha Activity in Older Adults
    (Frontiers Media S.A., 2023) Küçük, K.M.; Wienke, A.S.; Mathes, B.; Başar Eroğlu, Canan
    Multistable stimuli lead to the perception of two or more alternative perceptual experiences that spontaneously reverse from one to the other. This property allows researchers to study perceptual processes that endogenously generate and integrate perceptual information. These endogenous processes appear to be slowed down around the age of 55 where participants report significantly lower perceptual reversals. This study aimed to identify neural correlates of this aging effect during multistable perception utilizing a multistable version of the stroboscopic alternative motion paradigm (SAM: endogenous task) and a control condition (exogenous task). Specifically, age-related differences in perceptual destabilization and maintenance processes were examined through alpha responses. Electroencephalography (EEG) of 12 older and 12 young adults were recorded during SAM and control tasks. Alpha band activity (8–14 Hz) was obtained by wavelet-transformation of the EEG signal and analyzed for each experimental condition. Endogenous reversals induced gradual decrease in posterior alpha activity in young adults which is a replication of previous studies’ findings. Alpha desynchronization was shifted to anterior areas and prevalent across the cortex except the occipital area for older adults. Alpha responses did not differ between the groups in the control condition. These findings point to recruitment of compensatory alpha networks for maintenance of endogenously generated percepts. Increased number of networks responsible for maintenance might have extended the neural satiation duration and led to decreased reversal rates in older adults. Copyright © 2023 Küçük, Wienke, Mathes and Başar-Eroğlu.
  • Thumbnail Image
    Conference Object
    Age-Related Alterions in Theta and Alpha Oscillations During Perceptual Reversals
    (Elsevier, 2021) Küçük, Kurtulus Mert; Mathes, Birgit; Başar Eroğlu, Canan
    [Abstract Not Available]
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    Article
    Citation - WoS: 4
    Citation - Scopus: 4
    Oscillatory Activities in Multiple Frequency Bands in Patients With Schizophrenia During Motion Perception
    (Sage Publications Inc, 2022) Başar Eroğlu, Canan; Kuecuek, K. M.; Ruerup, L.; Schmiedt-Fehr, C.; Mathes, B.
    Patients with schizophrenia show impairment in binding stimulus features into coherent objects, which are reflected in disturbed oscillatory activities. This study aimed to identify disturbances in multiple oscillatory bands during perceptual organization of motion perception in patients with schizophrenia. EEG was recorded from healthy controls and patients with schizophrenia during continuous presentation of a motion stimulus which induces reversals between two exogenously generated perceptions. This stimulus was used to investigate differences in motion binding processes between healthy controls and patients with schizophrenia. EEG signals were transformed into frequency components by means of the Morlet wavelet transformation in order to analyse inter-trial coherences (ITC) in the delta (1-4 Hz), theta (4-7 Hz), alpha (8-12 Hz), and gamma (28-48 Hz) frequency bands during exogenous motion binding. Patients showed decreased delta-ITC in occipital and theta-ITC in central and parietal areas, while no significant differences were found for neither alpha nor gamma-ITCs. The present study provides one of the first insights on the oscillatory synchronizations related with the motion perception in schizophrenia. The ITC differences revealed alterations in the consistency of large-scale integration and transfer functions in patients with schizophrenia.