جستجوی مقالات مرتبط با کلیدواژه "asymmetry" در نشریات گروه "روانشناسی"

brain behavioral systems are related to avoidance and approach behavior. In the model of frontal asymmetry, Davidson introduced avoidance and approach systems. The aim of this study was to investigate The effect of affect induction on frontal and posterior asymmetry of alpha brain waves in individuals with high and low behavioral activation/inhibition systems.

In this regard, 300 non-disordered adults self-reported behavioral inhibition/activation systems questionnaire. After that, based on the Z scores in BAS/BIS scale, four groups (n=28, n=7 in each group) were selected. Quantitative electroencephalography was recorded for each individual in baseline, positive and negative affect induction. Absolute power of alpha waves in four regions and frontal and posterior asymmetries were calculated for each individual. Paired t-test and repeated Measures ANOVA were performed for statistical analysis.

In baseline condition, the high inhibition group showed frontal asymmetry (greater arousal in the F4 region) at the level of P =0.04. In terms of pleasant affect induction, the high and low activation groups showed frontal asymmetry at the level of P <0.01 (more arousal in F3 region). In terms of negative affect induction, the high inhibition group showed frontal asymmetry at the level of P =0.001 (more arousal in the F4 region), and the low activation group showed posterior asymmetry at the level of P = 0.002 (more arousal in the O2 region).

The findings confirm the Gray theory and Davidson model for the frontal asymmetry. Type of induced affect and personality differences Leads to different patterns of asymmetry.

The aim of this study was to compare the asymmetry of QEEG brainwaves in frontal areas between people with obsessive-compulsive disorder, major depression, and normal people.The statistical population of this study consisted of all individuals with major depressive disorder and obsessive-compulsive disorder who were referred to the psychiatric clinic of Fatemi Hospital in Ardabil in 2019. 15 persons with major depressive disorder (8 females and 7 males) and 15 persons with obsessive-compulsive disorder (5 females and 10 males) were selected according to the available sampling method, and 15 persons from the patients’ companions (7 females and 8 males) were selected in the same way and participated in this study. The Psychiatric Diagnosis and Structured Clinical Interview (SCID), Beck Depression Inventory (BDI-ll), and Obsessive Compulsive Disorder (OCI) by Foa et al. (2002) were used for data collection. In the next phase, QEEG registration was conducted in the psychology laboratory of Mohaghegh Ardabili University and the data were analyzed using SPSS25 software and Norogide software. Multivariate analysis of variance was used to analyze the research data. The degree of asymmetry of delta waves (F = 11.129), theta waves (F = 8.128), alpha waves (F = 3.810), and beta waves (F = 6.956) among the three groups of people with depressive disorders, obsessive-compulsive disorders, and normal people differs significantly in level (P < 0.001). The results of this study may be an important step to evaluate the therapeutic response and guide therapeutic strategies, including medication, brain stimulation, neurofeedback, or other rehabilitations.

In the present study, the effect of positive af-fect induction on verbal cognitive performance in extrovert and introvert personality types is studied. The first sample of the research includes 180 female students of Tarbiat Modares university selected with available sampling method. With respect to their score in Eysenck Personality Questionnaire and based on statistical analysis, 30 participants (in 2 extrovert and introvert groups) were chosen for the next step of the research. In the next step, a short movie clip for inducting positive affect was shown to the half of the participants, then respectively, the first verbal task and PANAS questionnaire were taken. After that, all previous steps (with an equal verbal task) were done but this time for negative affect induction. For the re-maining participants, the reverse process was done, i.e., first negative affect induction and then positive affect induction. The results were analyzed with de-scriptive statistics methods and t-test of two depen-dent groups, t-test of two independent groups and Yu-Mann-Whitney test. The observations showed that the positive affect induction improves the verbal fluency performance. On the other hand in the case of positive emotional induction, extroverts have better verbal performance than introverts. In general the results showed that the positive affect induction affects the cognitive performances. Also, personality traits associated with affections such as extroversion can modify these effects.

The aim of this study was to investigate the brain asymmetry and coherence between healthy controls and patients with alexithymia. Twenty four volunteers (14 alexithymic patients and 10 normal volunteers) were included in this study. All participants were asked to complete the Beck Anxiety Inventory (BAI), and Beck Depression Inventory (BDI) and Farsi version of Toronto Alexithymia Scale (FTAS-20), and then took a quantitative electroencephalography (qEEG) test. Inter-hemispheric asymmetries and coherences in theta and alpha frequency band (3.5-7 Hz; 8-12 Hz) were shown significant difference between the two groups. The smallest value of the Coherence was found in the 3.5-7 Hz range, in occipital lobe. The largest value of the left-right asymmetries was found in the 3.5-7 Hz in the central and occipital lobe and 8-12 Hz in occipital lobe. Based on the results of the present study, it can be concluded that having an unfeeling approach in dealing with external stimuli as well as deficit in emotional verbalization in alexithymic patients can be explained in terms of brain asymmetry and coherence.