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Keep Your Mood Stable!: Adolescent Mood Variability: Measurement, Development, and Association with Adjustment
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This dissertation contributes to our understanding of the nature, development, and significance of mood variability during adolescence. The results of the reported studies suggest that daily emotions can be reliably assessed and compared across adolescence. The studies further demonstrate that adolescence is a period in which most boys and girls come to grips with their moods, although some adolescents struggle with increasingly instable moods. This emphasizes the importance of addressing interindividual differences in adolescent mood development. Lastly, heightened mood
variability is shown to contribute to the development of both internalizing and externalizing problems as well as difficulties in parent-child relationships during adolescence. Overall, the results of this dissertation indicate that adolescents deal with
emotional challenges during this transformational period and about one in ten may need help to regulate fluctuating emotions to set the stage for a healthy development.
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This article gives an overview of previous work on affect variability, discusses the methodological shortcomings of research on affect variability, and presents the results of an empirical study of intraindividual variability in primary emotions across time. The results of a daily assessment study using structural equation modeling and nonlinear regression analyses showed that intraindividual variability in affect is a multidimensional construct that is sufficiently stable to be considered a psychological trait and can be reliably measured by the intraindividual standard deviation. Intraindividual variability showed convergent validity with mean level scores and neuroticism but was sufficiently distinct to be considered a unique trait. This was particularly true of intraindividual variability in positive emotions; only about 10% of the variance could be accounted for by mean affect levels and the variables of the 5-factor model of personality.
This study investigated daily states and time use patterns associated with depression. Four hundred eighty-three 5th to 9th graders reported on their experience when signalled by pagers at random times. Depressed youth reported more negative affect and social emotions, lower psychological investment, lower energy, and greater variability in affect. These differences were weaker for 5th and 6th graders, suggesting that self-reported feeling states are a poor indicator of depression prior to adolescence. No differences were found in the daily activities of depressed youths nor in the amount of time spent alone, but depressed youths experienced other people as less friendly and more often reported wanting to be alone, especially when with their families. They also spent less time in public places and more time in their bedrooms. Finally, depressed boys, but not girls, spent much less time with friends, particularly of the same sex, suggesting that social isolation is more strongly associated with depression for boys.
Adolescence is an important time for emotional development. Recently, daily diary methods are increasingly employed in research on emotional development and are used to explore the development of and sex differences in emotions during adolescence. However, before drawing conclusions about sex differences and developmental trends, one needs to ensure that the same construct is measured across sex and time. The present study tested measurement invariance of daily emotion assessments across sex, short-term (days within weeks) and long-term periods (days across years) in a sample of 394 adolescents (55.6% male) that were followed from ages 13 to 18. Moreover, the study examined the developmental trajectories of adolescent emotional experiences. Adolescents rated their daily emotions (happiness, anger, sadness, anxiety) during each day of a normal school week (Monday to Friday) for 3 weeks per year for 5 years (i.e., 15 weeks × 5 days = 75 assessments in total). Measurement invariance analyses suggest that the measurement of adolescent daily mood was invariant between boys and girls and across shorter and longer time intervals. Moreover, latent growth curve analyses showed that happiness decreased from early to middle adolescence, whereas anger, sadness, and anxiety increased. Anger returned to baseline toward late adolescence. In contrast, the decrease of happiness and the increase of anxiety leveled off without reversing, whereas sadness continued to increase. The discussion highlights the implications of measurement invariance in research on individual and developmental differences and discusses the findings in light of normative emotional development. (PsycINFO Database Record
Cannabis is the most widely produced and consumed illicit psychoactive substance worldwide. Occasional cannabis use can progress to frequent use, abuse and dependence with all known adverse physical, psychological and social consequences. Individual differences in cannabis initiation are heritable (40-48%). The International Cannabis Consortium was established with the aim to identify genetic risk variants of cannabis use. We conducted a meta-analysis of genome-wide association data of 13 cohorts (N=32 330) and four replication samples (N=5627). In addition, we performed a gene-based test of association, estimated single-nucleotide polymorphism (SNP)-based heritability and explored the genetic correlation between lifetime cannabis use and cigarette use using LD score regression. No individual SNPs reached genome-wide significance. Nonetheless, gene-based tests identified four genes significantly associated with lifetime cannabis use: NCAM1, CADM2, SCOC and KCNT2. Previous studies reported associations of NCAM1 with cigarette smoking and other substance use, and those of CADM2 with body mass index, processing speed and autism disorders, which are phenotypes previously reported to be associated with cannabis use. Furthermore, we showed that, combined across the genome, all common SNPs explained 13-20% (P<0.001) of the liability of lifetime cannabis use. Finally, there was a strong genetic correlation (rg=0.83; P=1.85 × 10(-8)) between lifetime cannabis use and lifetime cigarette smoking implying that the SNP effect sizes of the two traits are highly correlated. This is the largest meta-analysis of cannabis GWA studies to date, revealing important new insights into the genetic pathways of lifetime cannabis use. Future functional studies should explore the impact of the identified genes on the biological mechanisms of cannabis use.
how do boys and girls experience the social and biological changes that occur as they become reproductively mature / what does this experience mean to them and to others / how does it alter self-definitions and relationships / what are the effects on subsequent development in a variety of domains, including competence, psychopathology, and deviant behavior
we regret that we are able to say little about the pubertal experience of groups other than middle-class white youth / also [we] . . . will provide more information about girls' than boys' experiences
history of pubertal research / physiological changes of puberty (PsycINFO Database Record (c) 2012 APA, all rights reserved)
