Title Page
Abstract
Contents
Chapter 1. Introduction 9
1.1. Definition of Stress 10
1.2. Measurement of Stress 11
1.3. Stress in Late Life 12
1.4. Stress and Cognitive Function 13
1.5. Stress and Social Network 14
1.6. Social Network and Cognitive Function 16
1.7. Purpose of this Study and Hypothesis 17
Chapter 2. Methodology 19
2.1. Participants 19
2.2. Measures 20
2.2.1. Psychological Measurements 20
2.2.2. Neuropsychological Assessment 22
2.2.3. Social Network Characteristic 28
2.3. Analysis 30
Chapter 3. Results 32
3.1. Descriptive Statistics on the Characteristics of Research Participants 32
3.2. Correlation between Main Variables 33
3.3. Reliability and Validity of Perceived Stress Scale - 10 37
3.4. Effect of Perceived Stress on Cognitive Function 39
3.5. Mediation Effect of Social Network Quantity and Quality on the Relationship between Perceived Stress and Cognitive Function 42
Chapter 4. Discussion 48
4.1. Effect of Perceived Stress on Cognitive Function 48
4.2. Mediation Effect of Social Network Quantity in the Relationship between Perceived Stress and Cognitive Function 49
4.3. Mediation Effect of Social Network Quality on the Relationship between Perceived Stress and Cognitive Function 50
4.3.1. Mediation Effect of Emotional Closeness 50
4.3.2. Mediation Effect of Social Network Strength 53
4.4. Significance and Limitations of the Study 53
Bibliography 56
Korean Abstract 65
Table 1. Neuropsychological measures 27
Table 2. Participant information 33
Table 3. Correlation between main variables 35
Table 4. Confirmatory factor analysis of PSS - 10 38
Table 5. Regression results 41
Table 6. The mediation effect of social network quantity in the relationship between PSS level and cognitive function 44
Table 7. The mediation effect of social network quality in the relationship between PSS level and cognitive function 45
Table 8. The mediation effect of emotional closeness in the relationship between LSE and PH levels and cognitive function 46
Figure 1. Transactional model of stress 11
Figure 2. Mediation effect of emotional closeness on the association between perceived stress total score (PSS) and recall Index. 47
Figure 3. Mediation effect of emotional closeness on the association between lack of perceived self-efficacy score (LSE) and recall Index. 47
Figure 4. Mediation effect of emotional closeness on the association between perceived helplessness score (PSS) and recall Index. 47