دکتر علی یونسی
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Introduction
This study aims to investigate the attentional bias toward drug-related stimuli along with subjective craving after encountering such stimuli in methamphetamine users. Studies of cue reactivity have confirmed bias in attention and gaze to drug-related stimuli for most substances, but methamphetamine drugs are less studied by a direct measure such as eye tracking.
MethodsThirty male subjects in the case group (methamphetamine-users) and 36 subjects in control group (no prior drug use) participated in this study. Eye movement data were collected while subjects viewed pairs of drug-related and non-drug images in a dot-probe paradigm. Craving was assessed via a self-report questionnaire on the scale of 0 to 10 before and after the psychophysical task.
ResultsAnalysis of eye-movement data showed meaningful gaze bias toward cue images (drug-related) for the case group. Additionally, the gaze duration on cue-images was significantly higher in the case group, while the opposite held true for the control group. The same effect was observed in the analysis of the dot probe task, that is, the mean reaction time to a probe which replaced a cue-image was significantly lower. The mean of the first-fixation measure in control group was not significantly better than chance but the percentage of first-fixation on cue images in the drug-users was meaningfully biased. Reported craving was reported as significantly greater after performing the task compared to before.
ConclusionAltogether, our results indicate an attentional bias toward drug-related cues in methamphetamine users as well as subjective craving after encountering such cues.
Keywords: Attentional bias, Methamphetamine, Craving, Substance addiction, Eye movement measurements -
بکارگیری هم زمان علوم اعصاب و معماری، گرایش نوینی را به دست می آورد با نام «معماری عصب محور» که پژوهش حاضر در این راستا است. در این پژوهش با ترکیبی از روش تحقیق کیفی و کمی (همبستگی و آزمایشگاهی) به مقوله چگونگی بکارگیری عناصر معماری (مانند نور، هندسه، رنگ و...) در جهت ارزیابی حس معنویت در فضای داخلی مساجد پرداخته شده است. در این راستا در فاز اول با انتخاب یک مسجد مربوط به دوران گذشته (مسجد شیخ لطف الله اصفهان) و یک مسجد معاصر (مسجد الجواد تهران) و به روش ANP، ترتیب مولفه های معماری موثر بر ادراک حس معنویت در فضای داخلی این دو مسجد مشخص شده است. در فاز دوم جهت تشخیص احساسات افراد در مساجد منتخب، کار به صورت آزمایشگاهی و به روش EEG-VR به معنای استفاده ی همزمان از دستگاه الکتروآنسفالوگرافی و واقعیت مجازی انجام گرفته است که آزمودنی ها شامل 24 نفر (12 نفر مرد و 12 نفر زن) بوده است. جهت تفسیر اطلاعات، روش آمار استنباطی تحلیل رگرسیون چندگانه برای آزمون فرضیه صورت گرفته است. در فاز سوم، نتایج فاز اول و دوم ادغام شده و بحث می گردد. یافته ها نشان می دهد ما بین نحوه بکارگیری عناصر معماری و ارتقای حس معنویت در فضای داخلی مساجد ارتباط معناداری وجود دارد و مسجد متعلق به گذشته نسبت به مسجد معاصر دارای احساس معنویت بیشتری در بین آزمودنی ها بوده است.
کلید واژگان: احساس معنویت, مساجد, علوم اعصاب, الکتروآنسفالوگرافی, واقعیت مجازیFor centuries, architects have acknowledged the effects of the buildings in which we live, learn, work, and worship. How we feel, how we behave in these spaces, what energizing interactions within our bodies occur in these spaces, and our inspirations from these spaces, are very important today for architects and neuroscientists. The application of neuroscience, psychology, and architecture acquires a new trend called neuroarchitecture. This knowledge focuses on the design of architectural structures, humans, and seeks to design spaces with maximum efficiency and positive effects on space users. In this research, with the approach of neuroscience and with a combination of qualitative and quantitative research methods (correlation and laboratory) to the category of how to use architectural elements (such as light, geometry, color, materials, etc.) to evaluate the sense of spirituality in mosques (Dome) is addressed. The important point in this research is the use of neuroscience and laboratory tools in examining the emotions of users in space. The effect of the factors affecting the "feeling of spirituality" in the architectural space due to the changes in human brain signals is a matter between interdisciplinary and completely scientific and laboratory. The main purpose of neuroscience is to extract invisible information from the human brain. Therefore, no questions or questionnaires or interviews are taken from individuals, but information is extracted directly and without any intermediaries.At the beginning of the research by the descriptive method refers to the types of brain signals and brain functions and previous research will be done in the background. in the first phase, by selecting a mosque related to the past (Sheikh Lotfollah Mosque of Isfahan) and a contemporary mosque (Al-Jawad Mosque of Tehran), through expert questionnaire and ANP method and SuperDecision software to determine the order of effective architectural components The perception of spirituality in the interior of these two mosques has been discussed. Then, in the second phase, in order to diagnose the emotions of people in selected mosques, laboratory work was performed by EEG-VR method, which means simultaneous use of electroencephalography and virtual reality devices. The subjects included 24 people (12 men and 12 women). Then, the data obtained from the experiment in MATLAB software were analyzed and then, for interpretation of information and by inferential statistics, multiple regression analysis was performed to test the hypothesis. In the third phase, the results of the first and second phases are merged and discussed. At the end of the study, it was concluded that there is a significant relationship between how to use architectural elements (light, color, materials, geometry, etc.) and promote a sense of spirituality in the interior of mosques and the mosque belongs to the past (Sheikh Lotfollah ) Has a greater sense of spirituality among the subjects than the contemporary mosque (Al-Jawad). It was also found that the use of emerging neuroscience knowledge in architectural research and the use of medical tools such as electroencephalography as well as new virtual reality technology, can be very effective in discovering human emotions and feelings.
Keywords: Sense of spirituality, mosque, neuroscience, electroencephalography, virtual reality -
طراحی مساجد در تاریخ معماری ایران، همواره نقطه به اوج رسیدن هنر و معماری اسلامی بوده است. معماری مساجد به دنبال الهام از مفاهیم کلام الهی است تا فضایی ایجاد نماید که عالم ملکوت و عالم ناسوت را قرین هم سازد و فضای معنوی واحدی را بیافریند. در این پژوهش به بررسی میزان تاثیرگذاری عوامل موثر بر ادراک حس معنویت در فضای داخلی مسجد نصیرالملک شیراز پرداخته شده است. در این راستا ابتدا پارامترهایی که در ادراک حس معنویت موثر هستند مشخص شد و سپس تعداد 120 پرسشنامه از دانشجویان معماری و شهرسازی دانشگاه شیراز جمعآوری گردید که روایی و پایایی آن توسط آلفای کرونباخ مورد تایید قرار گرفته است. سپس با استفاده از مدلسازی معادلات ساختاری حداقل مربعات جزیی (PLS-SEM) به تجزیه و تحلیل پرداخته تا رابطه بین پارامترها بر یکدیگر مشخص گردد. عوامل موثر بر ادراک حس معنویت، عوامل اجتماعی، عوامل حسی، عوامل کالبدی و عوامل محیطی میباشد که نتایج نشان میدهد تفاوت معنیداری در رتبه شاخصها وجود دارد. در ادامه شاخصها بر اساس میزان تاثیر بر ادراک معنویت از رتبه 1 به معنای بیشترین تاثیر تا رتبه 15 به معنای کمترین تاثیر مرتب شدهاند. یافتهها نشان میدهد بیشترین تاثیر بر ادراک معنویت مربوط به شاخصهای کالبدی است.
کلید واژگان: معماری, حس معنویت, مسجد نصیرالملک, روش معادلات ساختاریThe design of mosques in the history of Iranian architecture seems to be the Climax of Islamic art and architecture. The architecture of mosques seeks inspiration of concepts of the divine world in order to create an atmosphere that connect the material world to the immaterial world and creates a single spiritual space. In this study, the effect of factors affecting the perception of spirituality in the interior of Nasir Al-Molk Mosque in Shiraz has been investigated. In this regard, first the parameters that affect the perception of the sense of spirituality are determined and then 120 questionnaires are collected from architecture and urban planning students of Shiraz University, the validity and reliability of which has been confirmed by Cronbach’s alpha. Then, by modeling the structural equations of partial least squares (PLS-SEM), it is analyzed to determine the relationship between the parameters on each other. Factors affecting the perception of spirituality are social, sensory, somatic and environmental factors that the results show that there is a significant difference in the ranking of indicators. In the following, the indicators are arranged based on the degree of impact on the perception of spirituality from rank 1 meaning the most impact to rank 15 meaning the least impact. Findings show that the greatest impact on the perception of spirituality is related to somatic indicators.
Keywords: Architecture, Sense of Spirituality, Nasir Al-Molk Mosque, Structural Equation Modeling -
International Journal of Medical Toxicology and Forensic Medicine, Volume:10 Issue: 4, Autumn 2020, P 3Background
Gray’s revised Reinforcement Sensitivity Theory (r-RST) is a neuropsychological explanation of personality that has been broadly used in substance use disorders. Although the Behavioral Approach System (BAS) is strongly related to nicotine dependence, findings in Behavioral Inhibition System (BIS) are controversial and there is little information about the role of the Fight/Flight/Freeze System (FFFS) in nicotine dependence. The purpose of the present study was to evaluate the mediating role of Risky Decision Making (RDM) in this relationship to clarify the controversy and fill the gap.
MethodsThe final sample of this correlation study comprised of 347 university students (age, Mean±SD 23.2±6.7) who completed two self-report measures, including the Fagerstrom Test For Nicotine Dependence (FTND), Jackson-5 questionnaire of r-RST, and a computerized Iowa Gambling Task (IGT) to measure RDM. Pearson correlation and a path analysis framework were used to determine the simple, direct, and indirect effects of r-RST systems on nicotine dependence severity through RDM.
ResultsUsing Amos, path analyses demonstrated significant direct and indirect effects of BAS and FFFS/BIS on tobacco use. Also, the relationship between BAS/FFFS/BIS and tobacco use was shown to be mediated by RDM.
ConclusionIt was demonstrated that the relationship among BAS /FFFS/BIS and tobacco use can be partly explained using maladaptive RDM strategies, suggesting that decreasing reliance on decision-making in risky situations, while increasing the use of decision-making skills educations in risky situations, and increasing the use of alternative sensation and fun seeking by smoking and emotion regulation and mindfulness-based therapies might be effective interventions for subjects with heightened threat and reward sensitivity
Keywords: Nicotine dependence severity, Risky decision making, Reinforcement sensitivity theory, BAS, BIS, FFFS -
Recent studies have revealed a growing number of patients affected by opioid use disorders (OUDs). Comorbid disorders are suspected to increase the risk of opioid-related adverse effects or treatment failure. The correlation of opioid use with sleep disturbances has been reported in many different studies and suggested to be linked to the brain regions involved in reward processing. This narrative review was intended to discuss the most recent developments in our understanding of the intricate interaction between sleep disturbance and OUD. In addition, in this study, the effects of sleep problems on the occurrence of unpleasant consequences in addiction management, such as craving and relapse in OCD patients, were highlighted. It has been shown that drug use may trigger the induction of sleep disturbances, and those suffering from difficulties in sleeping are prone to relapse to drug use, including opioids. Moreover, pharmaceutical sleep aids are likely to interfere with opiate use.
Keywords: Craving, Analgesics, Opioid, Sleep aids, Pharmaceutical, Recurrence, Sleep wake disorders -
BackgroundWriting is a human communication tool. No disability behavioral assessment of dysgraphia due to stroke-induced neglect has been conducted in Iran.ObjectivesWe investigated rehabilitation of dysgraphia in patients with stroke-related neglect in Persian language- specific constructive errors of writing.MethodsAll patients were suffering from stroke-induced visual neglect. Five patients were evaluated for dysgraphia in a spontaneous writing task before and after rehabilitation without writing practice for 10 sessions with prism adaption (PA). Dysgraphia was classified into visuospatial omission error, visuospatial destruction error, visuospatial size error, visuospatial tilting error, poor handwriting style, visuospatial distance error, and visuospatial perseveration (addition) error. Neglect was evaluated using the star cancellation test (SCT), and line bisection test (LBT) and activities of daily living (ADL) was assessed by the Barthel index (BI) and the Catherine Bergego scale (CBS).ResultsAll patients showed significant improvement in dysgraphia (measured using spontaneous writing test), ADL (measured using CBS and BI), and neglect (measured using LBT and SCT) (P < 0.05). Visuospatial destruction errors were the most frequent and visuospatial omission errors were the least frequent errors.ConclusionsPA is a potential effective strategy in stroke rehabilitation of dysgraphia, visuospatial neglect and ADL. Unilateral spatial neglect and rehabilitation improves dysgraphia in Persian language speaking patients with right brain stroke.Keywords: Rehabilitation, Neglect, Dysgraphia, Writing, Language, Prism Adaption
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در حین فرایند بینایی، اطلاعات تولید شده توسط گیرنده های نوری استوانه ای و مخروطی پس از فشرده شدن در شبکیه، توسط سه مسیر جداگانه ی سلول های عقده ای به نام های مگنو، پاروو، و کونیو به مراکز پردازشی سطح بالاتر ارسال می شوند. شواهد مبتنی بر الکتروفیزیولوژی و سایکوفیزیک حاکی از آن است که این مسیرهای سه گانه، الگوهای خاصی از تخریب عملکردی را در بیماری اسکلروز چندگانه (MS) نشان می دهند. اگرچه fMRI می تواند مکانیابی دقیق فعالیت عصبی را در این مسیرها فراهم آورد، تاکنون هیچ مطالعه ای با استفاده از fMRI بر روی تخریب عملکرد این مسیرها در بیماران MS انجام نشده است. در این پژوهش به بررسی اختلالات ایجاد شده در عملکرد این مسیرها در بیماران MS پرداختیم. برای این منظور، سه محرک بینایی متفاوت با فرکانس های مکانی و زمانی خاص برای تحریک اختصاصی این سه مسیر تولید کردیم. این محرک ها به وسیله ی پروژکتوری کالیبره شده که در خارج از اتاق اسکنر MRI قرار داشت، به فرد داخل اسکنر نشان داده می شد. با استفاده از یک پروتکل استاندارد، از دو گروه سالم و مبتلا به MS (هر گروه شامل 5 نفر) تصویربرداری fMRI انجام شد. در نهایت، پاسخ های به دست آمده در قشر بینایی و ناحیه ی هسته ی زانویی جانبی (LGN) به طور درون گروهی و برون گروهی مورد تحلیل قرار گرفت. نتایج حاصله نشانگر الگوهایی از تخریب عملکردی در قشر بینایی و LGN در گروه MS بود. همچنین، از میان سه مسیر بینایی مگنو، پاروو، و کونیو در LGN، تنها در مسیر سلولی مگنو تخریب معنی دار عملکردی در بیماران MS مشاهده شد.
کلید واژگان: اسکلروزیس چندگانه (MS), مسیرهای بینایی, مگنو, پاروو, کونیو, هسته ی زانویی جانبی (LGN), تصویرنگاری عملکردی با تشدید مغناطیسی (fMRI)During vision process, the information produced by rod and cone photoreceptors is compressed in retina and then is transmitted by three separated pathways of ganglion cells, Magno, Parvo and Konio, to the upper level processing centers. There are electrophysiological and psychophysical evidences that these three pathways show characteristic patterns of malfunction in multiple sclerosis (MS) patients. Although fMRI can provide accurate localization of the neural activities in these pathways, there is no fMRI study on malfunctions of these pathwyas in MS yet. So by employing the differences in structure and function of these cells, we generated three different visual stimuli with different spatial and temporal frequencies to stimulate each pathway separately. These stimuli were shown to the subject inside MRI scanner by a calibrated projector located outside of scanner room. The fMRI data were acquired from two groups of normal and MS subjects (each including 5 subjects) by using a standard protocol. Finally, the activation results in visual lobe and LGN were analyzed in within-group and between-group levels. Results showed patterns of malfunctions in visual cortex and LGN in MS group. Also, among Magno, Parvo, and Konio cellular pathways in LGN, just the activation of Magno cellular pathway showed significant malfunction in MS group.
Keywords: Multiple Sclerosis (MS), Visual pathways, Magno, Parvo, Konio, Lateral Geniculate Nucleous (LGN), functional Magnetic Resonance Imaging (fMRI) -
BackgroundDetection of actual residual tumor extent after resection of gliomas is important for further treatment implications. Conventional MRI features such as T1 weighted contrast enhancement or T2 weighted hyperintensity are not strong indicators of the tumor. Therefore, it is needed to use advanced metabolic imaging such as magnetic resonance spectroscopy (MRS).ObjectivesThis work reports the contrast between MRS defining metabolic alteration and imaging features of residual tumor after glioma resection.MethodsEighteen patients with glioma after tumor resection were included in the study. Routine MRI sequences and multi-voxel MRS were obtained. Metabolic regions of interest (ROI) were defined for Cho/NAA and Cho/Cr in different thresholds. Imaging ROI for residual tumor (ROI-t) was defined on conventional MR images. Area of each ROI, the distance between ROI centers, and dice coefficient for the evaluation of similarity between imaging and metabolic ROIs were calculated.ResultsMaximum similarity and minimum distance of ROI centers were determined between ROI of Cho/NAA > 1.7 and ROI-t. For Cho/Cr, the maximum similarity was determined in > 1.5.ConclusionsFindings of the present study propose that MRS could be a proper detector for residual tumor after surgical treatment of glioma.Keywords: Glioma, MRI, Magnetic Resonance Spectroscopy (MRS), Metabolic Regions of Interest (ROI)
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مقدمهنمرات بیماران مبتلا به اختلال استرس پس از سانحه در پرسش نامه های خودسنجی همدلی، بدون در نظر گرفتن نوع هیجان کاهش می یابد. واکنش بهنجار این بیماران به هیجانات و موقعیت های مثبت، ضرورت بررسی همدلی با موقعیت های مثبت در این افراد را نشان می دهد. هدف پژوهش حاضر، بررسی همدلی نوجوانان مهاجر مبتلا به اختلال استرس پس از سانحه با موقعیت های مثبت بود.روشتعداد شرکت کنندگان هر یک از گروه های این پژوهش (مبتلا به اختلال استرس پس از سانحه، بدون علایم اختلال استرس پس از سانحه و گروه کنترل) که با شیوه ی نمونه گیری دردسترس انتخاب شده بودند، 15 نفر بود. آزمودنی ها با استفاده از مصاحبه ی بالینی ساختاریافته برای اختلالات محور یک، مقیاس تجدیدنظر شده ی رویداد، پرسش نامه های اضطراب بک و افسردگی کواکس و تکلیف چندوجهی همدلی ارزیابی و داده ها با روش های تحلیل واریانس یک متغیری و چندمتغیری و آزمون های تعقیبی تحلیل شدند.یافته هادر مطالعه ی حاضر، گروه های مورد مطالعه در همدلی با تصاویر مثبت تفاوت معناداری نشان ندادند. نمرات اضطراب و افسردگی گروه مبتلا به اختلال استرس پس از سانحه نسبت به دو گروه دیگر و نمرات اضطراب گروه بدون اختلال با گروه کنترل نیز معنادار بود.نتیجه گیریبا توجه به نتایج می توان گفت که نقص گزارش شده توسط محققان در میزان همدلی افراد مبتلا به اختلال استرس پس سانحه، شامل تمام موقعیت ها نمی شود و این افراد در هنگام همدلی با افراد دارای بار هیجانی مثبت نقصی نشان نمی دهند که این نکته می تواند در فرایند درمان این افراد مورد توجه قرار گیرد.کلید واژگان: اختلال استرس پس از سانحه, همدلی, موقعیت های مثبتIntroductionThe reduction in the scores of empathic patients with posttraumatic stress disorder in self-assessment questionnaires that evaluate their empathy regardless of their type of emotion, and their normal response to positive emotions and situations necessitates an examination of empathy with positive situations in these individuals. The purpose of this study was to investigate empathy with positive situations in migrant adolescents with posttraumatic stress disorder.Methoda total number of 45 adolescents were selected by the convenience sampling method and divided into 3 groups (15 in each group, including: adolescents with PTSD, adolescents without PTSD, and control group). Participants were evaluated by the Structured Clinical Interview for DSM Axis-I, the Impact of Event Scale-Revised, the Beck Anxiety Inventory (BAI), the Children’s Depression ]nventory (CDI), and a multi-dimensional empathy task. Data were analyzed by ANOVA, MANOVA, as well as post hoc tests.Resultsthere was no significant difference between groups in terms of empathy and positive pictures. There was a significant difference between anxiety and depression scores in the PTSD group than other groups. Also, compared to the control group, the differences of anxiety scores in adolescents without PTSD were significant.ConclusionAccording to the results, it can be concluded that the previous reports about deficit in empathy of individuals with PTSD does not include all situations, and this group of individuals do not show any deficit in empathy when they face individuals with positive emotions, which can be considered in the treatment of these persons.Keywords: Post-Traumatic Stress Disorder (PTSD), Empathy, Positive situations
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IntroductionTranscranial Direct Current Stimulation (tDCS) has been used as a non-invasive method to increase the plasticity of brain. Growing evidence has shown several brain disorders such as depression, anxiety disorders, and chronic pain syndrome are improved following tDCS. In patients with Obsessive-Compulsive Disorder (OCD), increased brain rhythm activity particularly in the frontal lobe has been reported in several studies using Eectroencephalogram (EEG). To our knowledge, no research has been done on the effects of electrical stimulation on brain signals of patients with OCD. We measured the electrical activity of the brain using EEG in patients with OCD before and after tDCS and compared it to normal participants.MethodsEight patients with OCD (3 males) and 8 matched healthy controls were recruited. A 64-channel EEG was used to record a 5-min resting state before and after application of tDCS in both groups. The intervention of tDCS was applied for 15 minutes with 2 mA amplitude where anode was placed on the left Dorsolateral Prefrontal Cortex (DLPFC) and cathode on the right DLPFC.ResultsIn line with previous studies, the results showed that the power of Delta frequency band in OCD patients are significantly higher than the normal group. Following anodal tDCS, hyperactivity in Delta and Theta bands declined in most channels, particularly in DLPFC (F3, F4) and became similar to normal signals pattern. The reduction in Delta band was significantly more than the other bands.ConclusionAnodal tDCS over the left DLPFC significantly decreased the power of frequency bands of Delta and Theta in Patients with OCD. The pattern of EEG activity after tDCS became particularly similar to normal, so tDCS may have potential clinical application in these patients.Keywords: Transcranial Direct Current Stimulation (tDCS), Dorsolateral Prefrontal Cortex (DLPFC), Obsessive-Compulsive Disorder (OCD), Electroencephalogram (EEG)
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IntroductionTinnitus is one of the complex symptoms of hearing described as a phantom auditory sensation without any external stimulation. Due to the subjective nature of tinnitus, perception and discomfort of tinnitus vary among the patients. The main aim of this study is to investigate the effects of gender, age and the degree of hearing loss on discomfort due to tinnitus.MethodsEighteen patients with tinnitus, aged 21-72 years, (9 males and 9 females) were recruited. Tinnitus discomfort was investigated by Tinnitus Handicap Inventory (THI) questionnaire. Psychoacoustic assessments of tinnitus and auditory threshold assessments were evaluated using a 2-channel clinical audiometer.ResultsThe results showed no significant correlation between THI scores with loudness matching (P=0.187), mean of auditory threshold (P=0.304), gender (P=0.93) and age (P=0.200). Also, no significant correlation was found between maximal level of hearing loss and pitch matching (P=0.208).ConclusionThe study findings suggests that tinnitus is not correlated with age, gender and hearing loss. Overall, tinnitus is a complicated clinical condition which its real impact and degree of discomfort are unclear. More investigation is needed to clarify the factors involving in tinnitus annoyance.Keywords: Tinnitus, Gender, Age, Hearing loss, Discomfort
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IntroductionMild Cognitive Impairment (MCI), a disorder of the elderly people, is difficult to diagnose and often progresses to Alzheimer Disease (AD). Temporal region is one of the initial areas, which gets impaired in the early stage of AD. Therefore, auditory cortical evoked potential could be a valuable neuromarker for detecting MCI and AD.MethodsIn this study, the thresholds of Auditory Steady-State Response (ASSR) to 40 Hz and 80 Hz were compared between Alzheimer Disease (AD), MCI, and control groups. A total of 42 patients (12 with AD, 15 with MCI, and 15 elderly normal controls) were tested for ASSR. Hearing thresholds at 500, 1000, and 2000 Hz in both ears with modulation rates of 40 and 80 Hz were obtained.ResultsSignificant differences in normal subjects were observed in estimated ASSR thresholds with 2 modulation rates in 3 frequencies in both ears. However, the difference was significant only in 500 Hz in the MCI group, and no significant differences were observed in the AD group. In addition, significant differences were observed between the normal subjects and AD patients with regard to the estimated ASSR thresholds with 2 modulation rates and 3 frequencies in both ears. A significant difference was observed between the normal and MCI groups at 2000 Hz, too. An increase in estimated 40 Hz ASSR thresholds in patients with AD and MCI suggests neural changes in auditory cortex compared to that in normal ageing.ConclusionAuditory threshold estimation with low and high modulation rates by ASSR test could be a potentially helpful test for detecting cognitive impairment.Keywords: Alzheimer disease, Auditory Steady-State Response (ASSR), Auditory ageing, Mild cognitive impairment, MCI detection
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BackgroundTo investigate the association between non-alcoholic fatty liver disease (NAFLD) and quantitative measures of central adiposity in the general population using a semi-automated method on magnetic resonance imaging (MRI) data.MethodsSubjects were recruited from Golestan Cohort Study. Two groups of 120 individuals with and without fatty liver were randomly selected based on findings of ultrasound. Non-invasive diagnosis of NAFLD was made by combination of ultrasound and MRI. Various anthropometric indices including body mass index (BMI), waist-to-hip ratio (WHR) and waist-to-height ratio (WHtR) were measured. Segmentation and calculation of visceral (VFA) and subcutaneous fat area (SFA) were performed on three levels of MRI slices using semi-automated software.ResultsA total of 109 individuals fulfilled the NAFLD criteria, while 92 subjects were selected as the control group. All obesity measures, except for SFA, were significantly higher in subjects with NAFLD compared to controls. Significant associations were found between NAFLD and adiposity indices, except for SFA, with the highest odds ratio observed in WHR (OR: 3.37, CI: 1.403.70, PConclusionsQuantitative measures of visceral adiposity are associated with NAFLD, while subcutaneous fat measures are poor indicators for identifying NAFLD. Compared to conventional anthropometric indices, VFA best correlates with ultrasound and MRI criteria of fatty liver.Keywords: Abdominal fat segmentation, General population, Non, alcoholic fatty liver disease, Subcutaneous fat, Visceral fat
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IntroductionMethamphetamine is a powerful psychostimulant that causes significant neurological impairments with long-lasting effects and has provoked serious international concerns about public health. Denial of drug abuse and drug craving are two important factors that make the diagnosis and treatment extremely challenging. Here, we present a novel and rapid noninvasive method with potential application for differentiation and monitoring methamphetamine abuse.MethodsVisual stimuli comprised a series of images with neutral and methamphetamine-related content. A total of 10 methamphetamine abusers and 10 age-gender matched controls participated in the experiments. Event-related potentials (ERPs) were recorded and compared using a time window analysis method. The ERPs were divided into 19 time windows of 100 ms with 50 ms overlaps. The area of positive sections below each window was calculated to measure the differences between the two groups.ResultsSignificant differences between two groups were observed from 250 to 500 ms (P300) in response to methamphetamine-related visual stimuli and 600 to 800 ms in response to neutral stimuli.ConclusionThis study presented a novel and noninvasive method based on neural correlates to discriminate healthy individuals from methamphetamine drug abusers. This method can be employed in treatment and monitoring of the methamphetamine abuse.Keywords: Event, related potential, Brain, Methamphetamine, Craving
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PurposeDyslexia is one of the most common learning disabilities affecting millions of people worldwide. Although exact causes of dyslexia are not well‑known, a deficit in the magnocellular pathway may play a role. We examined possible deficiency of magnocellular, as compared to parvocellular and koniocellular pathway function by measuring luminance and color perception.MethodsVisual stimuli consisted of a series of natural images, divided into layers of luminance, red‑green and blue‑yellow, which probed magnocellular, parvocellular, and koniocellular pathways, respectively. Thirteen children with dyslexia and 13 sex- and age- matched controls performed three psychophysical tasks. In the first task, subjects were instructed to match the contrast of luminance (magno) and red‑green (parvo) images to that of the blue‑yellow (konio) images. In the second task, subjects detected the isoluminant point of red‑green images to probe parvocellular pathway. In the third task, temporal processing was assessed by measuring reaction time and percentage of correct responses in an identification task using four categories of images, activating all three pathways.ResultsThe dyslexic group had significantly elevated luminance and color contrast thresholds and higher isoluminant point ratio in comparison to the control group. Furthermore, they had significantly less correct responses than the control group for the blue‑yellow images.ConclusionWe may suggest that dyslexic subjects might suffer from both magnocellular and parvocellular deficits. Moreover, our results show partial impairment of the koniocellular pathway. Thus, dyslexia might be associated with deficits in all three visual pathways.Keywords: Dyslexia, Koniocellular, Magnocellular, Parvocellular
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IntroductionMusic can elicit powerful emotional responses, the neural correlates of which have not been properly understood. An important aspect about the quality of any musical piece is its ability to elicit a sense of excitement in the listeners. In this study, we investigated the neural correlates of boredom evoked by music in human subjects.MethodsWe used EEG recording in nine subjects while they were listening to total number of 10 short-length (83 sec) musical pieces with various boredom indices. Subjects evaluated boringness of musical pieces while their EEG was recording.ResultsUsing short time Fourier analysis, we found that beta2 rhythm was (16-20 Hz) significantly lower whenever the subjects rated the music as boring in comparison to nonboring.DiscussionThe results demonstrate that the music modulates neural activity of various partsof the brain and can be measured using EEG.Keywords: Music, Emotion, Boredom, EEG, Brain Rhythms
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بازی رایانه ای یا گروه درمانی؛ کدام یک بر کنترل ولع مصرف اثر بیشتری دارد؟از میان عوامل موثر در سوء مصرف مواد، ولع مصرف، نقش مهم تری در پدیده ی بازگشت و حفظ موقعیت سوء مصرف و وابستگی به مواد دارد. ولع مصرف، یک میل غیر قابل کنترل برای مصرف مواد است، میلی که اگر برآورده نشود رنج های روان شناختی و بدنی فراوانی هم چون ضعف، بی اشتهایی، اضطراب، بی خوابی، پرخاشگری و افسردگی را در پی دارد (انستیتو ی ملی اعتیاد 1996).
یکی از راه کارهای درمانی کارآزمایی شده در این حوزه، گروه درمانی می باشد. این شیوه به افراد کمک می کند تا با کمک اعضای گروه، جنبه های نهفته و پنهان وجودشان (احساسات، تفکر، نگرش ها و باورها) را درباره ی یک مساله یا مجموعه ای از مسائل مرتبط با هم، روی صحنه بیاورند و به کمک رهبر گروه به بازنگری جنبه های متنوع درونی موضوع بپردازند. در این شیوه، مهارت های اجتماعی به فرد آموخته می شود، روابط ناسالم او اصلاح می گردد، عزت نفس او افزایش یافته و موجب کاهش استرس وی می شود.
بازی های رایانه ای از فعالیت هایی است که بیشتر بیماران با اشتیاق در طول زندگی خود به تجربه ی آن پرداخته اند. حال اگر این بازی ها در راستای کاهش ولع مصرف آن ها باشد می توان از آن ها به عنوان جایگزینی مناسب در برنامه ی درمان بیماران استفاده کرد. با توجه به این که بازی رایانه ای کینکت نیز با انجام حرکات فیزیکی بالا و همراه بودن پاداش میسر است، برای درمانگران حوزه ی اعتیاد، تحرکات فیزیکی بیمار به همراه کاهش وسوسه ی بیماران، بسیار قابل اهمیت و ملاحظه است.
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Previous evidence has shown that the number of L and M cones in retina varies significantly between subjects. However, it is not clear how the variation of L/M ratio changes the behavioral performance of the subject. A model of transformation of data from retina to visual cortex for evaluation of various L/M cones ratios is presented. While L/M cone ratios close to 1 brings the best performance for one of postreceptoral (magnocellular) channels, we showed that the performance in the second channel (parvocells) will improve when the ratio furthers away from 1. Effects of different ratios of S were also explored.
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Visual stimulation with precise control of stimulus has transformed the field of psychophysics since the introduction of personal computers. Luminance and chromatic features of stimulus, timing, and position of the stimulus are the main features that could be defined using programs written specifically for psychophysical experiments. In this manuscript, software used for the psychophysical experiments have been reviewed and evaluated for ease of use, license, popularity, and expandability.
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Advanced Glycation End-Products and Their Receptor-Mediated Roles: Inflammation and Oxidative StressGlycation is a protein modification, which results in a change in a protein structure. Glycation is believed to be the etiology of various age-related diseases such as diabetes mellitus and Alzheimer’s disease (AD). Activation of microglia and resident macrophages in the brain by glycated proteins with subsequent oxidative stress and cytokine release may be an important factor in the progression of AD. It is also suggested that interaction between an advanced glycation end product (AGE) and its receptor (RAGE) results in glial activation as well as cytokine release and reactive oxygen species release. The use of antioxidants, receptor mediated compounds and reactive oxygen species scavenging enzyme produce an opportunity to intervene with AGE-RAGE signaling pathway, and thereby to slow down the progression of aging-related diseases.
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The information generated by cone photoreceptors in the retina is compressed and transferred to higher processing centers through three distinct types of ganglion cells known as magno, parvo and konio cells. These ganglion cells, which travel from the retina to the lateral geniculate nucleus (LGN) and then to the primary visual cortex, have different structural and functional characteristics, and are organized in distinct layers in the LGN and the primary visual cortex. Magno cells are large, have thick axons and usually collect input from many retinal cells. Parvo cells are smaller, with fine axons and less myelin than mango cells. Konio cells are diverse small cells with wide fields of input consisting of different cells types. The three cellular pathways also differ in function. Magno cells respond rapidly to changing stimuli, while parvo cells need time to respond. The distinct patterns of structure and function in these cells have provided an opportunity for clinical assessment of their function. Functional assessment of these cells is currently used in the field of ophthalmology where frequency-doubling technology perimetry selectively assesses the function of magno cells. Evidence has accrued that the three pathways show characteristic patterns of malfunctions in multiple sclerosis, schizophrenia, Parkinson's and Alzheimer's diseases, and several other disorders. The combination of behavioral assessment with other techniques, such as event related potentials and functional magnetic resonance imaging, seems to bear promising future clinical applications
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