Yıldız, SultanYuluğ, BurakKocabora, Mehmet SelimHanoğlu, Lütfü2021-01-142021-01-142021Yıldız, S., Yuluğ, B., Kocabora, M. S. ve Hanoğlu, L. (2021). Power spectral density and coherence analysis of eye disease with and without visual hallucination. Neuroscience Letters, 740. https://dx.doi.org/10.1016/j.neulet.2020.1354440304-39401872-7972https://dx.doi.org/10.1016/j.neulet.2020.135444https://hdl.handle.net/20.500.12511/6241Objectives: Charles Bonnet Syndrome (CBS) is a rare clinical condition which has been defined as complex visual hallucinations (CVH) due to visual loss. This study investigated differences in the EEG power spectral density (PSD) and magnitude-squared coherences between patients with eye disease and hallucinations (VH+), and the control subjects with eye disease without hallucinations (VH-). Methods: 19 scalp channels EEG was recorded in four VH+ (CBS) and four VH- subjects during an eyes-closed resting condition. Artefact-free epochs were analyzed to obtain PSD values in the delta, theta, alpha1, alpha2, beta1, beta2 and gamma frequency bands. Coherence values were calculated through inter-hemispheric and intra-hemispheric electrodes pairs of interest. All subjects were performed with neuropsychological and behavioral assessments to evaluate cognitive functions. Results: The VH + group had increase PSD in theta, beta2 and gamma bands in central, parietal and occipital (O2) areas. The synchronicity was altered particularly in parietal and frontal-parietal regions especially at theta and alpha1 respectively. Conclusions: The aberrant activity in occipital and parietal regions suggest the mechanism of CBS. This is a major electrophysiological study of understanding CBS and visual hallucinations.eninfo:eu-repo/semantics/embargoedAccessVisual HallucinationsCharles Bonnet SyndromeEEGArticle74010.1016/j.neulet.2020.135444Q3Q2