Cheng, T., Stone, A., & Coplan, R.J. (2025). Using language to test developmental differences in attitudes towards solitude in adolescents and emerging adults. Social Development, 34(3), e70010. https://doi.org/10.1111/sode.70010

Ding, X., McVarnock, A., Mingxin, L., Coplan, R.J., Ooi, L.L., Yu, J. & Sang, B. (2025). Motivations for social withdrawal and socio-emotional functioning among urban/suburban Chinese children. Journal of Applied Developmental Psychology. Advance on-line publication. https://doi.org/10.1016/j.appdev.2025.101787

Ladd, G., Ettekal, I., Ladd, B., & Coplan, R.J. (2025). Joint developmental trajectories of anxious solitude and peer adversity from early childhood through adolescence: Characteristics and associations with indices of internalizing problems. Developmental Psychology, 61(2), 397-416). https://doi.org/10.1037/dev0001848

Li, M., Yu, J., Coplan, R.J., Bowker, J.C., Xu, G., & Ding, X. (2025). The significance of best friends’ motivations for social withdrawal: Associations with socio-emotional adjustment in Chinese children and adolescents. Journal of Research on Adolescence, 35(1), e13043. https://doi.org/10.1111/jora.13043

McVarnock, A.M., Coplan, R.J., White, H., & Bowker, J.C. (2025). Looking beyond time alone: An examination of solitary activities in emerging adulthood. Journal of Personality [Personality Processes in Positive Solitude: A Special Issue of Registered Reports], 93(1), 81-100. https://doi.org/10.1111/jopy.12905

Refol, J., Raufi, S., Delgado-Ron, J.A., Mulligan, K., Hill, T.G., Benoit, C., Coplan, R.J., Pinel, E.C., Skakoon-Sparling, S., Helm, P.J., Oliffe, J.L., Bombaci, P., & Card, K.G. (2025).  Diverse community perspectives on potential public health guidelines for social connection: A qualitative study in Canada. Health Promotion International, 40, daaf131. https://doi.org/10.1093/heapro/daaf131

Sette, S., Brunetti, M., Pecroa. G. & Coplan, R.J. (2025). Examining links between motivations for social withdrawal, time spent alone, and indices of internalizing problems in childhood and early adolescence. Journal of Early Adolescence, 45(6), 769-793. https://doi.org/10.1177/02724316241279003

Stone, A., Cheng, T., & Coplan, R.J. (2025). I speak to the trees because nature is my friend: Conceptualization and assessment of connection to nature in solitude. Health and Place [Special Issue: Loneliness and the Built Environment]. Advance-online publication. https://doi.org/10.1016/j.healthplace.2025.103499

Stone, A., DeGroot, M., McVarnock, A., Cheng, T., Bowker, J.C., & Coplan, R.J. (2025). The risks of being a wallflower: Exploring links between introversion, aspects of solitude, and indices of well-being in adolescence. Behavioral Sciences [Special Issue – Social Behaviors in Childhood: Causes and Consequences], 15(2), 108. https://doi.org/10.3390/bs15020108

Zava, F., Sette, S., Vecchio, G.M., Laghi, F., Baumgartner, E., & Coplan, R.J. (2025). Exploring links between social competence, immigrant background, and children’s preschool adjustment. Early Education & Development, 36(2), 343-363. https://doi.org/10.1080/10409289.2024.2389367

Xiao, B., Parent, N., Coplan, R.J., & Shapka, J.D. (2025). How do young adults feel about receiving “likes” on social media? The moderating roles of shyness and cyber-victimization. Emerging Adulthood. Advance-online publication. https://doi.org/10.1177/21676968251367493

Abidin, F., Sunardy, G.N., Yudiana, W., Alverina, Y., & Coplan, R.J. (2024). Assessment and correlates of aloneliness among Indonesian adolescents. Heliyon, 10(7), e28862. https://doi.org/10.1016/j.heliyon.2024.e28862

Brunetti, M., Sette, S., Cheng, T., Laghi, F., Longobardi E., Pastorelli, C., Zuffianò, & Coplan, R.J. (2024). Solitary groups: A latent profile analysis of motivations for social withdrawal and experiences of solitude in late childhood and early adolescence. Social Development, 33(4), e12742. https://doi.org/10.1111/sode.12742

Brunetti, M., Sette, S., Longobardi, E., Laghi, F., & Coplan, R.J. (2024). Loneliness and aloneliness as mediators of the associations between social withdrawal and internalizing problems in late childhood and early adolescence. Journal of Early Adolescence, 44(6), 790-814. https://doi.org/10.1177/02724316231207282

Coplan, R.J., Weingarten, J.P., Bowker, J.C., Ooi, L.L., & Archbell, K. (2024). Maternal beliefs about the costs and benefits of solitude in childhood and adolescence. Journal of Child and Family Studies, 33(5), 1517-1530. https://doi.org/10.1007/s10826-023-02713-x

McVarnock, A., Cheng, T., Stone, A., DeGroot, M. & Coplan, R.J. (2024). The development of social withdrawal research in childhood and adolescence over 70 years: A systematic scoping review. Merrill-Palmer Quarterly, 70(2), 189-217.

Nyborg, G., Mjelve, L.H., Coplan, R.J., Edwards, A., & Crozier R. (2024). Exploring Norwegian teachers’ perceptions of shy students at recess and their strategic responses. Advance on-line publication. International Journal of Inclusive Education. https://doi.org/10.1080/13603116.2024.2343089

Nyborg, G., Mjelve, L.H., Crozier, W.R., Arneson, A., Coplan, R.J., & Edwards, A. (2024). Teachers’ strategies for helping shy students: Findings from a national survey in Norway. Scandinavian Journal of Educational Research, 68(5), 1011-1024. https://doi.org/10.1080/00313831.2023.2196534 

Bekkhus, M., McVarnock, A., Coplan, R.J., Ulset, V., & Kraft, B. (2023). Developmental changes in the structure of shyness and internalizing symptoms from early to middle childhood: A network analysis. Child Development, 94(4), 1078-86. https://doi.org/10.1111/cdev.13906

Bowker, J.C., Sette, S., Ooi, L.L., Bayram-Ozdemir, S., Braathu, N., Bølstad, E., Castillo, K.N., Dogan, A., Greco, C. Kamble, S., Kim, H.K., Kim, Y., Liu, J., Oh, W., Rapee, R.M., Wong, Q.J.J., Xiao, B, Zuffianò, A, & Coplan, R.J. (2023). Cross-cultural measurement of social withdrawal motivations across ten countries using multiple-group factor analysis alignment. International Journal of Behavioral Development, 47(2), 190-198. https://doi.org/10.1177/01650254221132774

Deng, X., Zhang, S., Chen, X., Coplan, R.J., Xiao, B., & Ding, X. (2023). Links between social avoidance and frontal alpha asymmetry during processing emotional facial stimuli: An exploratory study. Biological Psychology, 178, 108516. https://doi.org/10.1016/j.biopsycho.2023.108516

Ding, X., Zhang, W., Ooi, L.L., Coplan, R.J., Zhu, X., & Sang, B. (2023). Relations between social withdrawal subtypes and socio-emotional adjustment among Chinese children and early adolescents. Journal of Research on Adolescence, 33(3), 774-785. https://doi.org/10.1111/jora.12837

McVarnock, A.M., Cheng, T., Polakova, L., & Coplan, R.J. (2023). Are you alone? Measuring solitude in childhood, adolescence, and emerging adulthood Frontiers in Psychiatry, 14. [Special Issue: Causes & Consequences of Solitude in Childhood and Adolescence]. https://doi.org/10.3389/fpsyt.2023.1179677

Sette, S., Zava, F., Baumgartner, E., Laghi, F., & Coplan, R.J. (2023). Examining links between social withdrawal subtypes and internalizing problems among Italian primary school children. European Journal of Developmental Psychology, 20(2), 268-286. https://doi.org/10.1080/17405629.2022.2086118

Sette, S., Zava, F., Laghi, F., Baumgartner, R., & Coplan, R.J. (2023). Linking social relationships at school, loneliness, and academic self-perceptions among primary school children. Journal of Applied Developmental Psychology, 88, 101588. https://doi.org/10.1016/j.appdev.2023.101568

Sun, Y., Bowker, J.C., Coplan, R.J., Liu, J., & Sang, B. (2023). Best friend’s popularity: Associations with psychological well-being and school adjustment in China during early adolescence. Journal of Youth and Adolescence, 52(3), 670-683. https://doi.org/10.1007/s10964-022-01719-w

Tsotsi, S., Goh, S., Coplan, R.J., Bølstad, E., Czajkowski, N. O., Smajlagic, D., & Bekkhus, M. (2023). Co-occurrence of internalizing difficulties and aggression in early childhood and risk of mental health problems in middle childhood. International Journal of Behavioral Development, 47(5), 384-396. https://doi.org/10.1177/01650254231187902

Xiao, B., Zhu, L., Kong, X., Li, Y. & Coplan, R.J. (2023). Shyness and socio-emotional adjustment in early childhood in mainland China: Exploring the roles of maternal parenting practices and beliefs about shyness. Journal of Child and Family Studies, 32(3), 833-845. https://doi.org/10.1007/s10826-022-02416-9

Yang, P., Coplan, R.J., Zhang, Y., Ding, X., & Zhu, Z. (2023). Assessment and implications of aloneliness in Chinese children and early adolescents. Journal of Applied Developmental Psychology, 85, 101514. https://doi.org/10.1037/cbs0000369

Zheng, K., Coplan, R.J., Chen, X., & Bian, Y. (2023). Longitudinal associations between depressive symptoms and preference for solitude among Chinese early adolescents: Separating between-person from within-person effects. Journal of Early Adolescence, 43(6), 784-814. https://doi.org/10.1177/02724316221124794

Zheng, K., Coplan, R.J., Teng, Z., Liang, L., Chen, X., & Bian, Y. (2023). How does interparental conflict affect adolescent preference for solitude? Depressive symptoms as mediator at between- and within-person levels. Journal of Family Psychology, 37(2), 173-182. https://doi.org/10.1037/fam0001057