Heterogeneous Digital Technologies and the Limits of a Common Social Isolation Pathway: A Comment on Zhu and Zhou [Letter]

Dear editor

We read with great interest the recent article by Zhu and Zhou examining the relationships among internet and smart device use, social isolation, and mental health among older adults with chronic diseases.¹ Their study addresses an important public health issue and provides valuable evidence from a large national sample. We particularly appreciate the authors’ effort to differentiate several forms of digital technology use and to investigate the mediating role of social isolation in explaining their associations with mental health. However, we believe that one central aspect of the interpretation deserves further discussion. Specifically, the conclusions appear to rely on the implicit assumption that conceptually heterogeneous digital technologies can be interpreted through a common explanatory pathway linking digital technology use, social isolation, and mental health. We respectfully suggest that this interpretation may extend beyond what the reported findings support.

Although the authors distinguish four indicators of digital technology use—internet access, internet healthcare, smart bracelets, and intelligent sleep monitors—they subsequently interpret these indicators within a common explanatory framework in which digital technology use contributes to better mental health through reduced social isolation.¹ We believe that this conceptual integration deserves closer examination. While these technologies share a digital interface, they differ substantially in their primary functions. Internet access may indicate the availability of digital resources and may facilitate access to information or communication opportunities; internet healthcare primarily reflects healthcare-related service use; and smart bracelets and intelligent sleep monitors are closer to wearable or monitoring technologies. This distinction matters because recent conceptual and empirical research describes digital engagement as a multidimensional construct² and shows that internet-related outcomes in older adults vary across types and purposes of use.^3,4 Research on wearable and monitoring technologies further suggests that their main mechanisms are often related to self-monitoring, behavioral feedback, and health management rather than social interaction.^5,6 As a result, these indicators should not be assumed to influence social isolation through the same psychological or behavioral pathway.

This issue becomes particularly relevant when considering the authors’ own findings. Whereas several digital indicators followed the expected direction of association with lower social isolation and better mental health, intelligent sleep monitor use showed a different pattern. Specifically, while its use was associated with lower social alienation, it was also associated with higher social exclusion, producing a pattern of indirect associations that differed from those observed for the remaining digital indicators.¹ This pattern suggests that the technologies included in the model may not operate through a single underlying psychosocial mechanism. Rather than reflecting only statistical variation, the heterogeneity of the reported findings may indicate functional differences in how specific digital technologies influence psychological well-being. In this respect, the results of the study appear to support a more differentiated interpretation of digital technology use than a single mediation pathway can fully capture.

Our point is not that the reported mediation analyses are statistically inappropriate. Rather, the concern is that the conceptual interpretation of the mediation model may be too broad for the set of digital indicators included. Social isolation is a highly plausible pathway when digital technologies are used for communication, social contact, or participation in social networks. However, the same pathway may be less directly applicable to technologies primarily designed for health monitoring, self-management, or behavioral feedback. In the case of wearable or monitoring devices, for example, the expected mechanism may involve self-monitoring, activity regulation, or disease-management behavior rather than reduced social isolation.^5,6 Therefore, interpreting internet access, internet healthcare, smart bracelets, and intelligent sleep monitors through a common social-isolation pathway may obscure technology-specific mechanisms that are also relevant to mental health among older adults with chronic diseases.

We believe that Zhu and Zhou’s findings may support a more differentiated interpretation than the one emphasized in the original discussion. Their results do not simply show that internet and smart device use are associated with mental health through social isolation; they also suggest that different digital technologies may have distinct, and in some cases divergent, relationships with social alienation, social exclusion, and mental health.¹ Clarifying these distinctions would strengthen the theoretical contribution of the study and avoid treating digital technology use as a functionally homogeneous construct. We therefore suggest that one important implication of the article is not only that digital technology use may be associated with reduced social isolation, but also that specific forms of digital engagement should be interpreted according to their social, clinical, and behavioral functions. We hope these comments contribute constructively to the discussion initiated by Zhu and Zhou.

Disclosure

The authors report no conflicts of interest in this communication.