Findings on the relationship between Internet addiction and psychological symptoms in Brazilian adults

This study evaluated the prevalence of Internet addiction (IA) and its association with negative psychological symptoms in Brazilian adults. A network analysis was conducted to estimate specific variables and their expected influence on IA. In this cross-sectional study, 15,476 adults (M_age = 37.5, SD = 9.59) completed an open web-based survey. Three questionnaires were used: the Internet Addiction Test (IAT), Depression Anxiety and Stress Scale (DASS-21) and Satisfaction With Life Scale (SWLS). Based on IAT scores, participants were classified as No-Risk user (NRU), Low-Risk user (LRU) or High-Risk user (HRU). We observed that 4.8% of the participants were classified in the HRU group. In addition, their risk for severe symptoms of depression was 10 times higher and, for anxiety, seven times higher than that in the NRU group (p < .001). Time spent using smartphones was also significantly higher in the HRU group (M_hours = 5.1, p < .001). The main factors associated with IA were depression, gender and anxiety, but the variable “having children” was the most influential in the IA network. These findings suggest that psychiatric symptoms are the main factors associated with IA among the adult population.     

Arbitrary metrics in psychology

Many psychological tests have arbitrary metrics but are appropriate for testing psychological theories. Metric arbitrariness is a concern, however, when researchers wish to draw inferences about the true, absolute standing of a group or individual on the latent psychological dimension being measured. The authors illustrate this in the context of 2 case studies in which psychologists need to develop inventories with nonarbitrary metrics. One example comes from social psychology, where researchers have begun using the Implicit Association Test to provide the lay public with feedback about their "hidden biases" via popular Internet Web pages. The other example comes from clinical psychology, where researchers often wish to evaluate the real-world importance of interventions. As the authors show, both pursuits require researchers to conduct formal research that makes their metrics nonarbitrary by linking test scores to meaningful real-world events.     

Effects of grammatical categories on children's visual language processing: Evidence from event-related brain potentials

This study examined how school-aged children process different grammatical categories. Event-related brain potentials elicited by words in visually presented sentences were analyzed according to seven grammatical categories with naturally varying characteristics of linguistic functions, semantic features, and quantitative attributes of length and frequency. The categories included nouns, adjectives, verbs, pronouns, conjunctions, prepositions, and articles. The findings indicate that by the age of 9-10 years, children exhibit robust neural indicators differentiating grammatical categories; however, it is also evident that development of language processing is not yet adult-like at this age. The current findings are consistent with the hypothesis that for beginning readers a variety of cues and characteristics interact to affect processing of different grammatical categories and indicate the need to take into account linguistic functions, prosodic salience, and grammatical complexity as they relate to the development of language abilities.     

Ambivalence toward the body: death, neuroticism, and the flight from physical sensation

Based on terror management theory, the authors suggest that ambivalent reactions to the human body are partially rooted in the association of the physical body with inescapable death and that individuals high in neuroticism are particularly vulnerable to such difficulties. Three experiments demonstrated that priming thoughts about one's death leads individuals high in neuroticism to flee from physical sensations, including pleasurable ones. In response to mortality salience, highly neurotic individuals spent less time submerging their arm in ice-cold water and using an electric foot massager but did not avoid stimulation in nontactile modalities (i.e., listening to music). The discussion highlights the role of existentially motivated self-repression in inhibitions surrounding the body.     

The properties of geophysical fields and their effects on elephants and other animals

Geophysical properties of acoustic, seismic, electric, and magnetic waveforms create opportunities and constraints for animals' communication and sensory monitoring of the environment. The geometric spreading of waves differs; at some frequencies, transmission is most efficient and has minimal noise. The spreading properties of seismic waves favor long-distance propagation for communication and environmental monitoring, and would benefit elephants (Elephas maximus and Loxodonta africana), such as in locating subsurface water. Extending C. E. O'Connell-Rodwell, B. T. Amason, and L. A. Hart (2000), a man jumping at 1.11 km propagated seismic waves at 10-40 Hz. Given the noise of lightning and the Schumann resonances, near field magnetic and electric transmission by animals would be most efficient around 1000 Hz.     

The relation of self-esteem variability to emotion variability, mood, personality traits, and depressive tendencies

The relation of self-esteem variability to personality, mood, and behavior was investigated. Self-esteem variability was measured by calculating the standard deviation of self-ratings made during a week of experience-sampling. Participants high in self-esteem variability were self-conscious, socially anxious, and avoidant of social contexts. Self-esteem variability was partially independent of the conceptually similar trait of affect-intensity. The contributions of the study to work on self-esteem stability are discussed.     

Maternal self‐perceptions and reactions to infant crying among intrusive and withdrawn depressed mothers

This study compared intrusive (N =15) and withdrawn (N = 10) mothers' ratings of their own interaction styles with their infants and the behaviors of videotaped models of intrusive and withdrawn mothers. Withdrawn mothers rated themselves as less withdrawn than the model withdrawn mother. Intrusive mothers viewed themselves as more intrusive than the model intrusive mother. Both groups viewed their own infants as more outgoing than the infants of the model intrusive and withdrawn mothers. The withdrawn mothers reported feeling more distressed when they observed an infant (of an intrusive or withdrawn mother) crying, suggesting that they feel more empathy than the intrusive mothers. © 2001 Michigan Association for Infant Mental Health.     

Psychological and social-structural influences on commitment to volunteering

A model is described in which commitment to volunteering is hypothesized to be the result of demographic qualities, personality, identity, values, and social relationships. The model is tested and cross-validated using data from a nationally representative sample of American adults. The results from structural equation modeling analyses suggest that the hypothetical model provides a good fit to the data. Moreover, the findings suggest that the relations of personality and demographic characteristics to hours devoted to volunteering are largely mediated by latent constructs capturing helping identity and community participation. The implications of the model and the findings for our understanding of volunteering are discussed.