Researcher:
Erdoğan, Ezgi Tuna

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Ezgi Tuna

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Erdoğan

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Erdoğan, Ezgi Tuna

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2021 - 20232

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    Single session anodal transcranial direct current stimulation on different cortical areas effects on pain modulation in healthy subjects
    (Hogrefe Publishing Group) Kucuk, Zeynep; Eskikurt, Gokcer; Kurt, Adnan; Ermutlu, Numan; Erdoğan, Ezgi Tuna; Karamürsel, Sacit; Faculty Member; Faculty Member; School of Medicine; School of Medicine; 168716; 19597
    Transcranial direct current stimulation (tDCS) studies in healthy volunteers have shown conflicting results in terms of modulation in pain thresholds. The aim of this study was to investigate how single session anodal tDCS and modulated tDCS (mtDCS) of distinct cortical areas affected pain and perception thresholds in healthy participants. Five different stimulation conditions were applied at different cortical sites to 20 healthy volunteers to investigate the effects of tDCS and mtDCS (20 Hz) on pain and perception thresholds. TDCS over the motor cortex (M1), mtDCS over the motor cortex, tDCS over the dorsolateral prefrontal cortex (DLPFC), mtDCS of the DLPFC, and mtDCS over the occipital cortex were the stimulation conditions. All of the stimulations were anodal. The stimulations were given in a randomized order at 20-minute intervals. For comparison, electrical pain and perception thresholds were obtained from the right middle finger before and during the tDCS. After each measurement, participants were asked to give a score to their pain. In repeated measures analysis of variance (RM-ANOVA) test, the Condition x Time interaction showed no significant influence on changes in pain, perception thresholds, and pain scores (p = .48, p = .89, and p = .50, respectively). However, regardless of the condition types, there was a significant difference in pain and perceptual thresholds during tDCS (p = .01, p = .025, respectively). Our findings did not support difference in pain and perception modulation by a single session anodal tDCS over M1 and DLPFC compared to the occipital cortex in healthy volunteers. The increase in all thresholds during tDCS, irrespective of conditions, and peripheral sensations, including an active control group, taken together, suggest a placebo effect of active tDCS. Future studies about pain and perception in healthy subjects should consider the level of experimental pain and a strong placebo effect.
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    Transcranial electrical stimulation for neuromodulation of somatosensory processing
    (Elsevier, 2021) Erdoğan, Ezgi Tuna; Karamürsel, Sacit; Faculty Member; Faculty Member; School of Medicine; School of Medicine; 168716; 19597
    Transcranial electrical stimulation is a promising neuromodulation technique that has gained interest in the last 20 years after Nitsche and Paulus showed the polarity-specific cortical modulation effect of the weak direct current stimulation over the scalp in 2000. In the following years, new electrical stimulation techniques were introduced, such as alternative current stimulation, random noise stimulation, and pulse current stimulation. According to the literature, transcranial electrical stimulation may be a potential tool to modulate inhibitory circuits to improve the sensory discrimination function and reduce the perception threshold. Furthermore, studies investigating the modulation of multisensory integration support that modulation of sensory networks may increase the perception of body ownership and sensory perception in patients with the prosthesis. Based on the current findings, the electrical modulation of somatosensory processing should be further investigated regarding the type of stimulation, target cortical areas, and optimal parameters of the application.
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    Neuromodulation of the left auditory cortex with transcranial direct current stimulation (tDCS) has no effect on the categorical perception of speech sounds
    (Elsevier, 2023) Işık, Mevlude; Eskikurt, Gökçer; N/A; Erdoğan, Ezgi Tuna; Faculty Member; School of Medicine; 168716
    Temporal cue analysis in auditory stimulus is essential in the perception of speech sounds. The effect of trans -cranial direct current stimulation (tDCS) on auditory temporal processing remains unclear. In this study, we examined whether tDCS applied over the left auditory cortex (AC) has a polarity-specific behavioral effect on the categorical perception of speech sounds whose temporal features are modulated. Sixteen healthy volunteers in each group were received anodal, cathodal, or sham tDCS. A phonetic categorization task including auditory stimuli with varying voice onset time was performed before and during tDCS, and responses were analyzed. No statistically significant difference was observed between groups (anode, cathode, sham) and within the groups (pre-tDCS, during tDCS) in comparisons of the slope parameter of the identification function obtained from the phonetic categorization task data. Our results show that a single-session application of tDCS over the left AC does not significantly affect the categorical perception of speech sounds.