Salivary Oxytocin Research Overwhelmingly Clings to Early Prosocial Theories, Limiting Diversification

While the understanding of oxytocin's roles has evolved significantly to include context-dependency, individual variability, and diverse regulatory functions, many recent studies, particularly in non-human species, still rely exclusively on early prosocial interpretations. This creates a gap where the rapid expansion of salivary oxytocin research has not been matched by a comparable diversification in theoretical engagement. Addressing this, researchers examined how theoretical perspectives are represented in the literature, highlighting a potential bottleneck in advancing our understanding of this versatile neuropeptide.

Researchers conducted a bibliometric and semantic analysis of 445 publications on salivary oxytocin published between 2005 and 2026. The study employed citation analysis to identify historical trends and dominant papers, keyword analysis to uncover thematic concentrations, and semantic cluster analysis to map conceptual frameworks. The primary goal was to assess the alignment of published research with current, more nuanced theoretical models of oxytocin function, contrasting it with early, simpler prosocial accounts.

The analysis revealed a strong dominance of early canonical studies, with a small number of papers accounting for a disproportionate share of citations. Keyword and semantic cluster analyses identified seven thematic domains, including stress research, parental care, and clinical studies, but noted limited integration across species. Explicit citation of selected landmark publications representing major conceptual frameworks of oxytocin function was uncommon, observed in only 16.6% of studies. Human studies primarily referenced publications representing social salience theory, while animal studies predominantly cited the prosocial framework.