Purpose: This cross-sectional study aimed to investigate the ability to adjust grip strength by comparing the characteristics of force generation and relaxation from childhood to adulthood. Method: This study included 225 participants aged 6, 11, 17, and 19-23 years (adults) who performed isometric hand-grip force as follows: maximum, half…

Introduction: Individuals with intellectual disabilities (ID) are at heightened risk of behavioral problems. Methods: This study investigated differences in the severity of challenging behaviors (CBs) among individuals with IDs at varying life stages. Data were collected from parents' retrospective interviews. Surveys were completed by 47 parents…

In "Teaching Expertise in Three Countries," Akiko Hayashi shows how teachers from Japan, China, and the United States think about what it means to be an expert teacher. Based on interviews with teachers conducted over the span of fifteen years and videos taken in their classrooms, Hayashi gives us a valuable portrait of expert teachers…

Pretend play is important for children's development. However, recent research indicates that, as preschool children age and get more proficient at pretend play, they prefer real objects. We examined whether toddlers prefer real objects when they are younger as well as when they are older and more proficient in pretend play situations. Forty-three…

In this paper, I first provide a brief review of how scholars have conceptualized, tested, and elaborated aptitude frameworks relevant to second language (L2) speech learning. Subsequently, I introduce an emerging paradigm that assigns a fundamental role to domain-general auditory processing (i.e., having a good ear) in L1 speech acquisition and…

A novel coronavirus, SARS-CoV-2, has spread widely throughout the world. To reduce the spread of infection, children are prevented from going to school and have fewer opportunities for in-person communication. Such changes in the everyday lives of children might influence their socio-emotional behaviors; however, the whole picture of the possible…

Studies on development and fairness judgments in resource allocations have mainly addressed the distribution of reward. However, the distribution of responsibility also requires exploration in the context of research on development and distributive justice. For an integrated understanding of reward and responsibility distributions, we briefly…

While several studies on study abroad have examined the impact of personal factors (e.g., gender, age, and family environment) on the decision to study abroad, a factor analysis has not yet been conducted on the reasons why some students choose not to study abroad. This paper highlights the role of academic study abroad programs in promoting…

We investigated performance levels on conducting continuous two-footed jumping of preschool children (4 years old) to high school students (16 years old) to clarify the developmental progression and sex differences in motor coordination and agility. In total, 450 children (boys: 227; girls: 223) participated in this study. We set 10 obstacles to…

Despite efforts to make school science appealing, students' negative attitude toward it persists globally. This qualitative study elucidates how and why undergraduate students in Japan had declining attitudes toward school science during primary and secondary school. Twenty-two first- and second-year students at a Japanese national university…

Utilizing the Survey of Adult Skills from the Program for the International Assessment of Adult Competencies (PIAAC) and the OECD database, this study investigates the role of gender inequality and public social spending in the gender gap in Not in Employment, Education, or Training (NEET) risk across various age cohorts. The research identifies a…

This study investigates typing skill acquisition in Japanese children with developmental dyslexia (DD) and other developmental disorders (ADHD, ASD). Given that phonological processing difficulties impair reading and writing, typing may serve as an alternative skill for written expression. Sixty-one students (ages 7-18) participated in five typing…

Previous research on identity development among adolescents has focused on the processes involved. However, it is unclear how the sense of identity (synthesis and confusion) develops and how it relates to life satisfaction. This study aims to examine the relationship between sense of identity and life satisfaction among Japanese youth living in…

Background: Individuals pursue teaching careers for numerous reasons, such as for instrumental or prosocial purposes. Aims: This study examined the personal (instrumental motivation) and social (prosocial motivation) utility of teaching as predictors of teaching quality in terms of clarity of instruction, classroom management, and cognitive…

This is the first meta-analysis to examine the outcomes of nonfamilial, intergenerational programs (IGP) on youth and older adults. Relevant studies were identified by screening the abstracts from five systematic reviews on the impact of intergenerational programs on psychosocial outcomes. After all studies were screened 23 independent studies…