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The ubiquity of media in children's lives makes it increasingly difficult for parents to keep track of their children's screen time, leading to considerable discrepancies in parent- and child-report. In the present study, we aimed to examine if and how these discrepancies can be explained by parent-child communication, in terms of children's self-disclosure, secrecy, and parental solicitation, and to what extend the quality of the parent-child relationship can influence these communication patterns. We tested two structural equation models to investigate the absolute discrepancy between parent and child estimates of children's screen time and parental underestimation, using dyadic data from 854 11-year-olds and their parents, in Switzerland. Our results showed that children's self-disclosure and secrecy behaviors were significantly associated with parental knowledge, where the relationship between self-disclosure and parental knowledge of children's screen time was the stronger among the two. Moreover, a good parent-child relationship, especially parents' ability in perspective taking, was significantly related to increased self-disclosure and decreased secrecy behaviors by children.

Despite today's ubiquitous nature of smartphones among adolescents, little is known about behavioural online and offline longitudinal predictors of problematic smartphone use (PSU). Guided by Uses and Gratifications Theory, we applied latent class analysis on survey data collected in 2017 from a cohort of 1096 adolescents ( Mage = 12.4, SDage = 0.56) and regressed PSU measured 1 year later on class membership, controlling for socio-demographic characteristics, social desirability and autoregressive effects. We extracted four distinct classes: social-recreational onliners ( n = 228), weekend onliners ( n = 331), balanced ( n = 404) and noninvolved ( n = 153). Characterised by significantly more time spent online for recreational and social networking activities, both during weekdays and weekend days, as well as less time for sleep, the social-recreational onliners class showed significantly higher levels of PSU over time. Future studies should assess not only duration but also the frequency of daily online activities to provide further insights into behavioural predictors of PSU.

The project was guided by the overarching question: "What does smartphone-mediated communication feel like?". The primary goal was to assess perceptions of mediated communication, using an experimental design and both self-report and psychophysiological data.
This project included two experimental studies where we manipulated synchronicity (immediate or delayed interactions), modality (text with or without emojis), and message valence (positive or negative). The use of psychophysiological data in the second experiment was an innovative element as these data have rarely been collected to study the context of mediated communication.
In addition to the two experimental studies, self-report data collected from the pre-questionnaires of both studies were analyzed to test: a) a moderated mediation model on the role of dispositional trust, social anxiety, and smartphone use in predicting problematic smartphone use, and b) the role of personality traits (including negative affectivity, impulsiveness, and delay of gratification) in association with problematic smartphone use, and their physiological effects on smartphone-mediated communication.

The project was guided by the overarching question: "What does smartphone-mediated communication feel like?". The primary goal was to assess perceptions of mediated communication, using an experimental design and both self-report and psychophysiological data.
This project included two experimental studies where we manipulated synchronicity (immediate or delayed interactions), modality (text with or without emojis), and message valence (positive or negative). The use of psychophysiological data in the second experiment was an innovative element as these data have rarely been collected to study the context of mediated communication.
In addition to the two experimental studies, self-report data collected from the pre-questionnaires of both studies were analyzed to test: a) a moderated mediation model on the role of dispositional trust, social anxiety, and smartphone use in predicting problematic smartphone use, and b) the role of personality traits (including negative affectivity, impulsiveness, and delay of gratification) in association with problematic smartphone use, and their physiological effects on smartphone-mediated communication.