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알츠하이머병 환자의 MRI를 활용한 경두개 직류 전기 자극 시뮬레이션에 관한 연구
송채빈,임철기,이종승,김동현,서현 대한의용생체공학회 2023 의공학회지 Vol.44 No.6
Purpose: There is increasing attention to the application of transcranial direct current stimulation (tDCS) for enhancing cognitive functions in subjects to aging, mild cognitive impairment (MCI), and Alzheimer’s disease (AD). Despite varying treatment outcomes in tDCS which depend on the amount of current reaching the brain, there is no general infor- mation on the impacts of anatomical features associated with AD on tDCS-induced electric field. Objective: The objective of this study is to examine how AD-related anatomical variation affects the tDCS-induced electric field using computational modeling. Methods: We collected 180 magnetic resonance images (MRI) of AD patients and healthy controls from a publicly available database (Alzheimer’s Disease Neuroimaging Initiative; ADNI), and MRIs were divided into female-AD, male-AD, female-normal, and male-normal groups. For each group, seg- mented brain volumes (cerebrospinal fluid, gray matter, ventricle, rostral middle frontal (RMF), and hippo- campus/amygdala complex) using MRI were measured, and tDCS-induced electric fields were simulated, targeting RMF. Results: For segmented brain volumes, significant sex differences were observed in the gray matter and RMF, and considerable disease differences were found in cerebrospinal fluid, ventricle, and hip- pocampus/amygdala complex. There were no differences in the tDCS-induced electric field among AD and nor- mal groups; however, higher peak values of electric field were observed in the female group than the male group. Conclusions: Our findings demonstrated the presence of sex and disease differences in segmented brain vol- umes; however, this pattern differed in tDCS-induced electric field, resulting in significant sex differences only. Further studies, we will adjust the brain stimulation conditions to target the deep brain and examine the effects, because of significant differences in the ventricles and deep brain regions between AD and normal groups.
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이동현,김지은,송채빈,이현주,송원영,이태준,이상훈,태기식,Lee, D.H.,Kim, J.E.,Song, C.B.,Lee, H.J.,Song, W.Y.,Lee, T.J.,Lee, S.H.,Tae, Ki-Sik 대한의용생체공학회 2016 의공학회지 Vol.37 No.3
Sexual addiction is accompanied with anxiety, psychological and physical dependence. Also, sexual addict want to make their presence through sexual adventures and seem sexually obsessed. In this study, we examined the changes of brain activity related to sexual addiction by utilizing the developed multi-sensory therapy after 4-weeks sex offender treatment program. We analyzed the electroencephalogram (EEG) activity changes in the subjects and regions of brain. As a result, the theta wave significantly increased after treatment than before (p < 0.001). The absolute alpha wave was increased whereas the relative alpha waves were decrease significantly (p < 0.001). The results could conclude that multi-sensory therapy on sex offender shows more stable status against sexual stimulations. Moreover, the reduction of the relative alpha waves in parietal lobe of sex offender is correlated to the less attention on sexual stimulations. The multi-sensory therapy not only provides a neurobiological explanation, but also can be used for clinical implications, i.e. prevention and treatments, for sex addiction.
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