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Data sets on gameplay, called digital biomarkers, contain many characteristics of game players and are associated with mental health problems. In fact, an avatar's behavior during an online game is said to be related to its player's mental health. Based on this information, we estimated the depressive state of players based on their avatar's behavioral logs. There were 3,361 participants who were players of Pigg Party, a popular Japanese online game application. In April 2020, the players logged into the Pigg Party and answered a questionnaire on depression. In May 2020, of the 3,361 participants, 658 players again logged into the Pigg Party and answered the depression questionnaire. Their responses to the questionnaire and behavioral logs of Pigg Party for April and May comprised the data sets used in the study. The data set from April showed that individuals without depression were more likely to perform activities in a 24-hour cycle than individuals with depression. Furthermore, the popular model of the time series data set trained on the April data set predicted depression in the May data set with an accuracy of around 0.3 to 0.4. The results suggest that these models are difficult to predict for sparse time series data sets, such as the study's data set, and require refinement. [ABSTRACT FROM AUTHOR]

A speaker's use of a title for the listener shows the speaker's deference to the listener. Previous studies suggested that the use of kinship terms in the family also shows deference to the listener. The present study focused on young adults' use of kinship terms for their parents to investigate whether their use of kinship terms reflects their perception of their parenting. The participants were 329 Japanese college students, who answered a questionnaire about their forms of address for their parents, perceived parental emotional accessibility, and perceived parental control. They also reported their satisfaction with their parent-child relationships and the frequency of parent-child communication. The results suggest that young adults who use kinship terms for their parents perceive their parents to be more emotionally accessible and communicate with their parents more than those who do not. Young adults who use kinship terms for their father are also more satisfied with their father-child relationships than those who do not. Young adults' use of kinship terms might signal not only their deference to their parents, but also their acceptance of their parent-child relationships. [ABSTRACT FROM AUTHOR]