Psikoloji Bölümü

Permanent URI for this communityhttps://hdl.handle.net/20.500.12416/416

Browse

Now showing 1 - 20 of 29

Sleep spindle-related electroencephalograph activity of young adults and its relation to cognitive functions
(2019) Torun Yazıhan, Nakşidil; Yetkin, Sinan
Objective: Sleep spindles are phasic bursts of thalamocortical activity, typically defined as 11-16 Hz (in sigma frequency band) with a duration of 0.5 and 2 seconds. Spindles are most prominent during N2 sleep and are a defining feature of this stage. The aim of the present study was to investigate the association between spindle characteristics and cognitive functions of young adults. Methods:The study sample consisted of 17 healthy male subjects aged between 19 and 28 years.The participants had no medical or psychological conditions and were not taking any medications that might affect their sleep pattern and neuropsychological measurements. Polysomnography recordings were conducted from 22:30 to 07:00 hour for two subsequent nights. The first night was for adaptation to the laboratory conditions and to rule out sleep apnea syndrome and periodic leg movements. The second night was used to analyze macro and micro parameters of sleep. A neuropsychological test battery comprising the Serial Digit Learning Test, Raven Standard Progressive Matrices, Verbal Fluency Test,Trail Making A-B, and the Auditory Verbal Learning Test were administered before the second-night sleep session. Sleep spindles in all non-rapid eye movement stage 2 sleep were scored visually from C3-A2 electroencephalogram derivation after polysomnographic analysis was completed. Each 30-sec epoch was analyzed with a high-pass band filtered at 0.3 Hz, and a low-pass band filtered at 35 Hz. Spindle characteristics such as duration, amplitude, mean and peak frequencies were analyzed using the fast Fourier transform algorithm. The association between the characteristics of sleep spindles and the neuropsychological test scores were analyzed using Spearman correlations. Results: Significant positive correlations were found between spindle density and both verbal auditory learning performance and verbal fluency, cognitive flexibility, and semantic organization performances. The serial digit learning test was correlated positively with mean duration, mean frequency, and peak frequency of sleep spindles. Finally, the mean duration, and mean frequency of spindles were positively correlated with verbal fluency, cognitive flexibility, and semantic organization. Conclusion: The associations between spindle features and memory, verbal fluency, and verbal learning abilities were consistent with previous research findings suggesting that sleep spindles might be related to cognitive abilities and the potential to learn. In other words, it might be an indicator of the current level of aptitude for learning.
Citation - WoS: 2
Citation - Scopus: 1
Relations Among Emotional Mood State Personality Dimensions and Social Desirability in Older Adults
(Gunes Kitabevi Ltd Sti, 2018) Kaynak, Hande
Introduction: Previous studies have shown that older adults report higher levels of positive affect (PA). Studies in the context of the five-factor model of personality have also noted the age-related changes in personality. However, the possible influence of personality on emotional state needs further investigation in older adulthood. This study examines relations among personality traits, social desirability, and positive/negative affectivity in conjunction with aging. Materials and Method: A total of 123 volunteers (62 young and 61 older adults) was participated in the study. A cross-design was used with consecutive sampling. All participants had higher education. Participants completed the Positive and Negative Affect Schedule as a measure of emotional state. Thereafter, they rated the degree to which each item described themselves on the Five-Factor Personality Inventory, which measures personality dimensions and social desirability. Results: Independent t-tests were conducted to compare young and older adults in terms of affectivity and personality. Findings revealed that older adults reported less negative affect (NA) compared with young adults. Older adults scored higher on agreeableness, conscientiousness, and social desirability, whereas young adults scored higher on extraversion and neuroticism. Based on correlational results, neuroticism was negatively correlated with extraversion, social desirability, and PA in older adults. Analyses of variance showed that conscientiousness, neuroticism, and social desirability impacted positive/negative affectivity. Conclusion: The results indicated that neuroticism proved to be the most important factor on emotional well-being. Older adults low on neuroticism experienced less NA. Furthermore, conscientiousness and social desirability had strong effects on PA indicating that the age-related differences found in affectivity might not only be attributable to age-related changes in personality, but also partly attributable to age-related increases in social desirability.
Citation - WoS: 12
Citation - Scopus: 12
Relationship of Internet Gaming Disorder Symptom Severity With Non-Suicidal Self-Injury Among Young Adults
(Kare Publ, 2020) Evren, Cuneyt; Evren, Bilge; Dalbudak, Ercan; Topcu, Merve; Kutlu, Nilay
Objective: The aim of the present study was to evaluate the relationship of Internet gaming disorder (IGD) symptom severity with non-suicidal self-injury (NSSI) while controlling the effects of depression, anxiety and neuroticism among young adults. Method: The present study was conducted as a cross-sectional online self-report survey. The data were collected from 1010 volunteer Turkish university students in Ankara, persons who were in the e-mail database of a company located in Istanbul that organizes e-sports tournaments (ESL Turkey Amateur e-sport players), and Turkish gamers from gaming forums. Participants were evaluated by administering the IGD Scale-Short Form (IGDS-SF), the neuroticism dimension of the Eysenck Personality Questionnaire Revised-Abbreviated Form, the Beck Anxiety Inventory, and the Beck Depression Inventory. Results: Age and gender did not differ between participants with NSSI (n=207, 20.5%) and those without NSSI (n=803, 79.5%). IGDS9-SF, depression, anxiety, and neuroticism scores were higher among individuals with NSSI. In logistic regression analysis, severity of IGD predicted the presence of NSSI, together with depression, anxiety, and neuroticism. Conclusion: These findings suggest that the severity of IGD in young adults is related with the presence of NSSI, together with depression, anxiety, and neuroticism. Thus, early detection and treatment of these risk factors is important for reducing self-injurious behavior in this age group.
Citation - WoS: 1
Sürpriz Bir Eski/Yeni Tanıma Belleği Görevinde Yaşlı Yetişkinlerde Olumlu Kelimeler İçin Tepki Yanlılığı Değişimi: Bir Tesadüfi Kodlama Çalışması
(Gunes Kitabevi Ltd Sti, 2017) Kaynak, Hande; Gökçay, Didem
Giriş: Yaşlı bireylerin özellikle olumlu kelimeleri bellekte daha iyi tuttukları bilinmesine rağmen, duygunun iki boyutunun (olumluluk ve heyecan düzeyleri) tesadüfi kodlama yapılan tanıma belleği performansı üzerindeki etkisi hâlâ netlik kazanmamıştır. Araştırmanın amacı, tesadüfi kodlanan ve olumluluk (olumlu, olumsuz ve nötr) ve heyecan düzeyleri (yüksek ve düşük) değişimlenen kelimelerin tanıma belleği puanları (bellek doğruluğu ve tepki yanlılığı) üzerindeki etkisini, sürpriz bir eski/yeni tanıma belleği göreviyle incelemektir. Gereç ve Yöntem: Çalışmaya, 60 genç ve 53 yaşlı olmak üzere 113 gönüllü katılmıştır. İlk olarak, duygusal kelimeler bilgisayarda tek tek sunulmuş, tesadüfi kodlama yapması istenen katılımcılardan kelimelerin kaç sesli harften oluştuğunu belirtmesi istenmiştir. 30 dakikadan sonra, test aşamasına geçilmiş, çalışma aşamasına atıfta bulunarak daha önce gördükleri kelimeleri tanımaları yönünde yönerge sunulmuş, sürpriz bir eski/yeni tanıma göreviyle bellek performansı kaydedilmiştir. Bulgular: 2×3×2 son faktörde tekrar ölçümlü deney deseni kullanılmıştır. Bağımlı değişken, tanıma belleği puanları olup, Sinyal Belirleme Kuramı temel alınarak bellek doğruluğu ve tepki yanlılığı hesaplanmıştır. Varyans analizlerine göre, yaşlıların kelimelerin olumluluk düzeyi açısından bellek doğruluğu puanları değişmemekle birlikte, özellikle olumlu kelimelere karşı istatistiksel olarak anlamlı bir tepki yanlılığı gösterdikleri bulunmuştur. Sonuç: Yaşlılar olumsuz kelimelere nazaran olumlu kelimelere daha çok önem vermektedir. Kelimelerin çaba harcamadan, tesadüfi kodlandığı koşulda, yaşla birlikte ortaya çıkan bu farklılık, yaşlıların iyi olma hallerini korumak adına duygularını düzenlediklerini öne sürmektedir. Çalışmamız bellek performansı ölçümlerinde, yaşla ilişkili etkenlerin belirlenmesinin önemine dikkat çekmektedir
Citation - WoS: 16
Citation - Scopus: 16
Severity of Dissociative Experiences and Emotion Dysregulation Mediate the Relationship Between Childhood Trauma and Internet Addiction Symptom Severity Among Young Adults
(Kare Publ, 2019) Evren, Cuneyt; Evren, Bilge; Dalbudak, Ercan; Topcu, Merve; Kutlu, Nilay; Elhai, Jon D.
Objective: The first aim of the present study was to evaluate the relationship between childhood trauma and Internet addiction (IA) symptom severity. The second aim was to evaluate the mediator effects of dissociative experiences and emotion dysregulation on this relationship. Method: We conducted the study using an online survey with 920 university student participants. Participants were evaluated with the Internet Addiction Test (IAT), Dissociative Experiences Scale (DES), Childhood Trauma Questionnaire (CTQ-28), and Difficulties in Emotion Regulation Scale (DERS). Results: Compared with participants evidencing low IA risk (n=806, 87.6%), those with high IA risk (n=114, 12.4%) had a longer duration of daily Internet use and a higher rate of problems related to Internet use. The high IA risk group was connected to the Internet less through a smartphone and more through computer use. In addition, scale scores (DES, DERS and CTQ-28) were higher among the group with high IA risk. Scale scores were mildly to moderately correlated with each other. In linear regression analysis, childhood trauma (particularly emotional abuse and physical neglect) was related to severity of IA symptoms. Severity of dissociative experiences and emotion dysregulation mediated the childhood trauma-IA symptom relationship. Conclusion: These findings suggest relations between the severity of childhood trauma, particularly emotional abuse and physical neglect dimensions, and severity of IA symptoms among Turkish young adults. Severity of dissociative experiences and emotion dysregulation may also partially mediate this relationship.
Citation - WoS: 2
Citation - Scopus: 3
The Relationship Between Probable Adhd and Playing Mmorpgs With the Severity of Disordered Gaming: The Effect of Gaming Motivations
(Kare Publ, 2021) Evren, Cuneyt; Evren, Bilge; Dalbudak, Ercan; Topcu, Merve; Kutlu, Nilay
Objective: The main aim of the present study was to consider the impact of gaming motivations among young adults when evaluating the relationship between probable attention deficit hyperactivity disorder (ADHD) and massively multiplayer online role-playing games (MMORPGs), with disordered gaming. Method: In the present study, participants were assessed with the Adult ADHD Self-Report Scales (ASRS-v1.1), the Motives for Online Gaming Questionnaire (MOGQ), and the nine-item Internet Gaming Disorder Scale-Short Form (IGDS9-SF). Results: Participants with probable ADHD (n=143,19.2%) and without probable ADHD (n=602, 80.8%) did not differ according to the current age, gender, presence of romantic relationship, marital status, where and with whom they are living, employment status and time spent on the gaming. Compared to participants without probable ADHD, those with probable ADHD had higher rates of having a game console, purchasing games, gaming more than usual on weekends, having problems related to gaming, probable internet gaming disorder (IGD) according to IGDS9-SF cut-off score and higher scales scores (IGDS9-SF and MOGQ), whereas they had a lower age at first gaming. Among different game types, those with probable ADHD were gaming more with multiplayer online battle arena games, social network games, music games, MMORPGs, sports games/car games, and horror-themed/survival games. Scores of all six types of gaming motives were higher among those with probable ADHD, and among them coping/escape, social, skill development, and fantasy distinguished the presence of probable ADHD. In the ANCOVA analysis, the presence of probable ADHD and the use of MMORPGs (as well as online gaming motives [coping/escape, recreation, fantasy, social and competition]) predicted the severity of IGD symptoms, and also these effects also interacted, involving probable ADHD and using MMORPGs. Conclusion:These findings suggest that those with probable ADHD may have different gaming characteristics than those without probable ADHD. Probable ADHD and using MMORPGs are related to the severity of disordered gaming, along with almost all type of online gaming motivations. Also, the effects of probable ADHD and MMORPGs use interacted with each other.
Citation - WoS: 6
Investigation of the Psychometric Properties of the Turkish Form of Subjective Memory Complaints Questionnaire
(Gunes Kitabevi Ltd Sti, 2013) Ozel Kizil, Erguvan Tugba; Baştuğ, Gülbahar; Duman, Berker; Altintas, Ozge; Kirici, Sevinc; Bastug, Gulbahar; Baran, Zeynel; Altunoz, Umut; Psikoloji
Introduction: Amnestic type of mild cognitive impairment (MCI) is characterized by the presence of subjective memory complaints and impairment of memory tests. This study aims to investigate the validity and reliability of the Turkish Version of the Subjective Memory Complaints Questionnaire (SMCQ). Materials and Method: The study sample consisted of 45 MCI patients and 44 healthy elderly controls. The SMCQ is a 14-item, "yes-no" questionnaire which evaluates the severity of subjective memory complaints. The discriminant validity of SMCQ was evaluated by comparing the scores of the two groups. For concurrent validity, the correlations between SMCQ and two widely-used cognitive screening tests (MMSE and ADAS-Cog) were calculated. ROC analysis was performed to test the diagnostic validity. For reliability analysis, internal consistency was calculated. Results: SMCQ scores of the patients were higher than the controls. SMCQ scores of the subjects were positively correlated with ADAS-Cog and negatively correlated with MMSE scores. Cronbach's value was 0.83. ROC analysis yielded a sensitivity of 80% and a specificity of 66% (cut-off=4.5). Area under the curve was 0.843. Conclusion: SMCQ is a valid and reliable instrument that can be used for the assessment of SMC in elderly patients. However, community based studies should be carried out for suggesting SMCQ as a screening tool.
A Review on Executive Functions and Memory Processes Associated with Feeding and Eating Disorders
(2020) Çobanoğlu, Fatma Öykü; Kaynak, Hande
From the beginning of humankind, feeding has become one of the most important requirements of social adaptation and survival. Since the 20th century, research on feeding and eating disorders has tried to give some explanations of various eating behaviors, such as starving because of thoughts about being overweight or non-stop binge eating by the individual, relational, or social factors. However, they are inadequate to fully explain the psychopathological and cognitive factors underlying feeding and eating disorders. The complex behavioral pattern behind eating disorders can lead to impairments in people’s attention, memory, and metacognitive processes. Certain higher-order cognitive mechanisms such as problem solving, reasoning, and decision making are impaired in individuals suffering from eating disorders, especially anorexia nervosa, bulimia nervosa, and binge eating disorder, compared to healthy individuals. Several researches aimed to find out evidence that may recover these impairments or that may lead to preventive measures for the risk of developing eating disorders. The aim of the current study is to examine the researches on the effects of eating disorders on individuals’ executive functions and memory processes and to explore the links between eating disorders, executive functions, and memory.
Citation - WoS: 15
Citation - Scopus: 15
Psychometric Validation of the Turkish Gaming Disorder Test: a Measure That Evaluates Disordered Gaming According To the World Health Organization Framework
(Aves, 2020) Evren, Cuneyt; Pontes, Halley M.; Dalbudak, Ercan; Evren, Bilge; Topcu, Merve; Kutlu, Nilay
Background: Previous research on gaming disorder (GD) used psychometric tools, which evaluates according to the American Psychiatric Association (APA) diagnostic framework. The Gaming Disorder Test (GDT), a standardized measure to assess symptoms and prevalence of GD according to the World Health Organization (WHO) diagnostic framework. The main aim of the current study was to adapt the GDT to Turkish. Methods: In the present study participants were assessed with the GDT, the Internet Gaming Disorder Scale-Short-Form (IGDS9-SF), and the CAGE-Problematic Internet Use Questionnaire (CAGE-PIUQ). The factor structure of the scale was tested with Con.rmatory Factor Analysis (CFA), and reliability and validity analyses were conducted. Results: A sample of 932 Turkish gamers (58.3% male, mean age 23.64 years, SD=5.42) was recruited online. Confirmatory factor analyses demonstrated that the unidimensional factor structure of the GDT was satisfactory. The scale was also reliable (i.e., internally consistent with a Cronbach's alpha of 0.879) and showed adequate convergent and criterion-related validity, as indicated by statistically significant positive correlations between average time daily spent playing games (ATDSPG) during last year, IGDS9-SF and CAGE-PIUQ scores. By applying the International Classification of Diseases 11th edition (ICD-11) threshold for diagnosing GD (e.g., meeting all four criteria by answering them either with 'often' [4] or 'very often' [5]), it was found that the prevalence of GD is 1.9% (n = 18). Conclusions: Online gaming preference, ATDSPG and probable ADHD predicted the severity of disordered gaming. These findings support the Turkish version of the GDT as a valid and reliable tool for determining the extent of GD related problems among young adults and for the purposes of early GD diagnosis in clinical settings and similar research.
Citation - WoS: 18
Citation - Scopus: 18
The Psychometric Properties of the Turkish Version of the Internet Gaming Disorder Scale
(Kare Publ, 2017) Evren, Cuneyt; Dalbudak, Ercan; Topcu, Merve; Kutlu, Nilay; Evren, Bilge
Objective: The main aim of the current study was to test the psychometric properties of the Internet Gaming Disorder Scale (IGDS), both the long (27-item) and short (9-item) polytomous versions, which are survey instruments that measure Internet gaming disorder (IGD) on the basis of the 9 criteria from the 5th edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5). Method: Participants were evaluated by applying the 27-item IGDS and the Young's Internet Addiction TestShort Form (YIAT-SF). The psychometric properties of the IGDS were tested through an online survey completed by volunteers who are university students in Ankara, active Internet game players, as well as individuals who are in the e-mail database of an Istanbul-based company which organizes e-sports tournaments. Results: A single component on the nine-item IGDS reached the criterion of an Eigenvalue greater than one (5.926), and the variance accounted for by this component was 65.85%. Confirmatory factor analyses demonstrated that the structural validity (i.e., the dimensional structure) of the nine-item IGDS was satisfactory. This short version of the scale was also reliable (i.e., internally consistent with Cronbach's a of 0.931) demonstrating good criterion-related validity, as indicated by positive correlations with time spent playing games, and the YIATSF score. Correlation between the 27-item IGDS and the nine-item IGDS was very high (n=457; r=0.988, p<0.001). Test-retest correlation for both the 27-item IGDS (n=261, r=0.759) and nine-item IGDS (n=261, r=0.756) were high. When the DSM-5 threshold for diagnosis (experiencing 5 or more criteria) was applied, the prevalence of disordered gamers ranged between 3.9% and 9.2%, according to the cutoff point chosen for each item. Conclusion: The results of the validity and reliability testing of the Turkish version of the nine-item IGDS were found to be similar to the findings of the original scale. These findings support the Turkish versions of the nine-item IGDS, which measure a unidimensional construct as being valid and reliable IGD screening instrument in determining IGD which can become problematic among young adults and also for the purposes of early diagnosis and use in other relevant research.
A Review on Executive Functions and Memory Processes Associated With Feeding and Eating Disorders
(Istanbul Universitesi, 2020) Çobanoğlu, F.Ö.; Kaynak, H.
From the beginning of humankind, feeding has become one of the most important requirements of social adaptation and survival. Since the 20th century, research on feeding and eating disorders has tried to give some explanations of various eating behaviors, such as starving because of thoughts about being overweight or non-stop binge eating by the individual, relational, or social factors. However, they are inadequate to fully explain the psychopathological and cognitive factors underlying feeding and eating disorders. The complex behavioral pattern behind eating disorders can lead to impairments in people’s attention, memory, and metacognitive processes. Certain higher-order cognitive mechanisms such as problem solving, reasoning, and decision making are impaired in individuals suffering from eating disorders, especially anorexia nervosa, bulimia nervosa, and binge eating disorder, compared to healthy individuals. Several researches aimed to find out evidence that may recover these impairments or that may lead to preventive measures for the risk of developing eating disorders. The aim of the current study is to examine the researches on the effects of eating disorders on individuals’ executive functions and memory processes and to explore the links between eating disorders, executive functions, and memory. © 2020, Istanbul Universitesi. All rights reserved.
Citation - WoS: 20
Citation - Scopus: 20
Neuroticism and Introversion Mediates the Relationship Between Probable Adhd and Symptoms of Internet Gaming Disorder: Results of an Online Survey
(Aves, 2019) Evren, Bilge; Evren, Cuneyt; Dalbudak, Ercan; Topcu, Merve; Kutlu, Nilay
OBJECTIVES: The aim of the present study was to evaluate relationship of probable attention deficit hyperactivity disorder (ADHD) with severity of the Internet gaming disorder (IGD), neuroticism and extraversion. METHODS: The study was conducted with online survey among 457 volunteered university students in Ankara and people who play games on the Internet and who are in the e-mail database of a company located in Istanbul that organizes e-sports tournaments. Participants were evaluated by applying the Adult ADHD Self-Report Scale (ASRS-v1.1), the 9-item Internet Gaming Disorder Scale (IGDS) and the Eysenck Personality Questionnaire Revised-Abbreviated Form (EPQR-A). RESULTS: Age was lower among those with the probable ADHD (n = 102, 22.3%) and those without (n = 355, 77.7%). Gender, educational status, and type of the participants did not differ between the groups. Severity of IGD symptoms and neuroticism were higher among those with the probable ADHD, whereas extraversion was lower. In logistic regression analysis, severity of IGD symptoms predicted the probable ADHD in the first Step, whereas when extraversion and neuroticism were included in the analysis as independent variables, low extraversion (introversion) and high neuroticism predicted the probable ADHD and severity of IGD symptoms was no longer a predictor. CONCLUSION: These findings suggest that the severity of IGD symptoms is related with the probable ADHD and low extraversion (introversion) and high neuroticism may have mediator effect on this relationship.
Citation - WoS: 11
Citation - Scopus: 12
Relationship of Internet Gaming Disorder Severity With Symptoms of Anxiety, Depression, Alexithymia, and Aggression Among University Students
(Kare Publ, 2019) Evren, Cuneyt; Evren, Bilge; Dalbudak, Ercan; Topcu, Merve; Kutlu, Nilay
Objective: The aim of the present study was to evaluate the relationship of Internet gaming disorder severity with alexithymia and aggression among university students, while controlling for effects of anxiety and depressive symptoms. Method: The study was conducted with an online survey among 987 volunteer university students in Ankara. Participants were evaluated by administering the Toronto Alexithymia Scale (TAS-20), the Buss-Perry Aggression Questionnaire (BPAQ), the Internet Gaming Disorder Scale-Short-Form (IGDS9-SF), and the depression and anxiety subscales of the 90-Item Symptom Checklist-Revised (SCL-90-R). Results: Scores for the different scales mildly correlated with one other. In hierarchical linear regression analysis, both alexithymia (particularly the dimensions "difficulty identifying feelings" [DIF] and "externally-oriented thinking" [EOT]) and aggression (physical aggression) predicted the severity of Internet gaming disorder symptoms, together with severity of depressive symptoms. Conclusion: These findings suggest that among university students, the severity of alexithymia, particularly in its dimensions DDF and EOT, is related with the severity of Internet gaming disorder, together with aggression, particularly physical aggression, and depression.
Citation - WoS: 1
Citation - Scopus: 1
Sleep Spindle-Related Electroencephalograph Activity of Young Adults and Its Relation To Cognitive Functions
(Ege Univ, 2019) Yazihan, Naksidil Torun; Yetkin, Sinan
Objective: Sleep spindles are phasic bursts of thalamocortical activity, typically defined as 11-16 Hz (in sigma frequency band) with a duration of 0.5 and 2 seconds. Spindles are most prominent during N2 sleep and are a defining feature of this stage. The aim of the present study was to investigate the association between spindle characteristics and cognitive functions of young adults. Methods:The study sample consisted of 17 healthy male subjects aged between 19 and 28 years.The participants had no medical or psychological conditions and were not taking any medications that might affect their sleep pattern and neuropsychological measurements. Polysomnography recordings were conducted from 22:30 to 07:00 hour for two subsequent nights. The first night was for adaptation to the laboratory conditions and to rule out sleep apnea syndrome and periodic leg movements. The second night was used to analyze macro and micro parameters of sleep. A neuropsychological test battery comprising the Serial Digit Learning Test, Raven Standard Progressive Matrices, Verbal Fluency Test,Trail Making A-B, and the Auditory Verbal Learning Test were administered before the second-night sleep session. Sleep spindles in all non-rapid eye movement stage 2 sleep were scored visually from C3-A2 electroencephalogram derivation after polysomnographic analysis was completed. Each 30-sec epoch was analyzed with a high-pass band filtered at 0.3 Hz, and a low-pass band filtered at 35 Hz. Spindle characteristics such as duration, amplitude, mean and peak frequencies were analyzed using the fast Fourier transform algorithm. The association between the characteristics of sleep spindles and the neuropsychological test scores were analyzed using Spearman correlations. Results: Significant positive correlations were found between spindle density and both verbal auditory learning performance and verbal fluency, cognitive flexibility, and semantic organization performances. The serial digit learning test was correlated positively with mean duration, mean frequency, and peak frequency of sleep spindles. Finally, the mean duration, and mean frequency of spindles were positively correlated with verbal fluency, cognitive flexibility, and semantic organization. Conclusion: The associations between spindle features and memory, verbal fluency, and verbal learning abilities were consistent with previous research findings suggesting that sleep spindles might be related to cognitive abilities and the potential to learn. In other words, it might be an indicator of the current level of aptitude for learning.
Citation - WoS: 14
Citation - Scopus: 17
Mediating Effects of Self-Esteem in the Relationship Between Attachment Styles and Social Media Addiction Among University Students
(Kare Publ, 2020) Demircioglu, Zeynep Isil; Kose, Asli Goncu
Objective: In the present time, internet and social media have become indispensable parts of our lives. Apart from the advantages of social media, some individuals have begun to suffer from Social Media Addiction (SMA) which is associated with dysfunctions in academic and/or work domains. Although outcomes of SMA have been relatively widely investigated, its predictive factors have not been studied extensively yet. The aim of the present study was to investigate the effects of secure, fearful, and preoccupied attachment styles on SMA and the mediating role of self-esteem in the links between attachment styles and SMA. Method: Data were collected from 455 university students (300 females, 155 males) who volunteered to complete the survey package that included SMA Scale, Relationships Questionnaire, and Rosenberg Self-Esteem Scale. Results: The data were analyzed using Structural Equation Modeling and moderated multiple regression. The results revealed that preoccupied and fearful attachment had significant positive direct effects on SMA. While the link of preoccupied attachment with SMA was partially mediated, the relationship between secure attachment and SMA was fully mediated by self-esteem. In addition, exploratory analyses revealed that gender moderated the relationship between self-esteem and SMA. Conclusion: The findings of this study suggest that fearful attachment and preoccupied attachment can be risk factors for SMA among university students. On the other hand, being securely attached and having high self-esteem can be protective factors for SMA.
Citation - Scopus: 2
Drivers’ Self-Reported Reasons of Speeding: a Turkish Driver Sample From Two Cities
(Gioacchino Onorati Editore, 2019) Doğruyol, B.; Erdost, B.G.; Hoe, C.H.; Gupta, S.; Lajunen, T.; Özkan, T.; Bıçaksız, P.
Speeding is an important risk factor of road traffic crashes, and identifying the factors associated with speeding is crucial for road safety. In the present study, face-to-face roadside interviews were conducted to investigate the reasons of speeding among Turkish drivers at six different data collection times in two different cities. A structured interview was administered to collect data from a total of 3317 and 1559 drivers in Ankara and Afyon cities, respectively. Results from the two cities consistently revealed that drivers’ self-reported speeding frequency was partially determined by gender and age. Also, perceiving speeding as a cause of crashes was associated with lower frequency of speeding. Finally, thinking that speed tickets are a means for increasing government income and that it would be safe to exceed the speed limit if driving “safely” was positively associated with frequency of speeding. These findings indicate the importance of norms and (biased) perceptions in speeding behavior. © 2019, Gioacchino Onorati Editore. All rights reserved.
Citation - WoS: 9
Citation - Scopus: 9
Relationship Between Internet Gaming Disorder Symptoms With Attention Deficit Hyperactivity Disorder and Alexithymia Symptoms Among University Students
(Turkish Green Crescent Soc, 2020) Evren, Bilge; Dalbudak, Ercan; Topcu, Merve; Kutlu, Nilay; Elhai, Jon D.; Evren, Cuneyt
The aim of the present study was to evaluate the relationship between Internet gaming disorder (IGD) symptom severity with probable attention deficit hyperactivity disorder (ADHD) and alexithymia symptoms, while controlling anxiety and depression symptoms. The cross-sectional online study was conducted with 987 volunteer university students in Ankara, Turkey. Age was lower and first. Internet use was earlier among the group with probable ADHD (n=166, 16.8%) than that without (n=821, 83.2%). There were no significant differences in gender or romantic relationship status between these groups, whereas the scale scores, duration of daily Internet gaming, and problems related to Internet gaming were higher in the probable ADHD group. Probable AMID, continuous scores on alexithymia (particularly "difficulty identifying feelings" [DIF] and "externally oriented thinking" [EOT] dimensions), depression, and anxiety symptoms were associated with higher severity of IGD symptoms. ADHD, alexithymia (as a binary variable), depression, and anxiety predicted the severity of IGD symptoms, although these effects involving probable ADHD and alexithymia did not interact. These findings suggest that probable AMID and both the severity of alexithymia (particularly DIF and EOT dimensions) and presence of probable alexithymia are related with the severity of IGD symptoms, even when controlling the effects of depression and anxiety, among university students.
Severity of Internet Gaming Disorder Symptoms Might Be Related With the Body Mass Index
(Taylor & Francis Ltd, 2018) Evren, Cuneyt; Evren, Bilge; Dalbudak, Ercan; Topcu, Merve; Kutlu, Nilay
Citation - WoS: 30
Citation - Scopus: 36
Overcoming Public Speaking Anxiety of Software Engineers Using Virtual Reality Exposure Therapy
(Springer-verlag Berlin, 2017) Gulec, Ulas; Gozcu, Mert Ali; O'Connor, Rory V.; Clarke, Paul M.; Nazligul, Merve Denizci; Yilmaz, Murat
Public speaking anxiety is a type of social phobia, which might be commonly seen in novice software engineers. It is usually triggered by a fear of social performance especially when the performer is unfamiliar with the audience. Today, many software engineering activities (e.g. code inspection, peer review, daily meetings, etc.) require social gatherings where individuals need to present their work. However, novice software engineers may not be able to reduce their performance anxiety during their course of education. In this study, we propose a virtual reality approach to construct a practice environment for improving novice software engineers' pubic speaking experiences. Consequently, we examine the effects of virtual reality intervention on the public speaking experience of six novice software engineers from a computer engineering department. We designed a virtual auditorium to simulate the presentation delivery environment and findings suggest that using this infrastructure for training purposes can reduce presenter anxiety levels - which is consistent with related published studies. We believe that this virtual auditorium environment can deliver benefits for students and practitioners alike in terms of addressing the anxiety that is often associated with early stage career presenters.
Impact of information bandwidth of in-vehicle technologies on young drivers' attention maintenance performance: A Driving simulator study
(Human Factors an Ergonomics Society Inc., 2017) Bıçaksız, Pınar
Previous research indicates that young novice drivers' ability to maintain their attention on the forward roadway during driving is poorer than experienced drivers, leading to more frequent excessively long off-road glances that elevate the risk of crashes. This study directly manipulated information bandwidth of an in-vehicle monitor and asked young drivers to perform the number judgment task during simulated driving. Results show that the drivers produced more number of off-road glances and longer summed excess glance durations in 1.5-second threshold when the in-vehicle task imposed greater information processing demand. The crash risk estimated from the obtained summed excess glance durations is 3.2 times higher when the information processing demand was high than low using the 1.5-second threshold, and 4.3 times higher using the 2.0-second threshold. In practice, designers of in-vehicle technologies should consider information-processing demands of in-vehicle tasks that the technologies require in order to minimize the frequency of excessively long off-road glances during driving

Browse

Browsing Psikoloji Bölümü by Scopus Q "Q4"