Loneliness is defined as the subjective perception of lacking satisfying social relationships and is distinct from voluntary solitude. Prolonged loneliness is associated with adverse physical and mental health outcomes, including increased risks for cardiovascular disease, metabolic disorders, cancer, depressive disorders, and dementia. Biological mechanisms proposed to underlie these associations include elevated cortisol, altered hypothalamic–pituitary–adrenocortical (HPA) activity, oxidative stress, and inflammatory processes.
The present study integrates two theoretical perspectives to account for interindividual variation in loneliness. Jaak Panksepp’s Affective Neuroscience Theory identifies evolutionarily ancient subcortical emotional–motivational systems—SEEKING, RAGE, FEAR, CARE, SADNESS / PANIC / SEPARATION DISTRESS, and PLAY—that shape basic affective processes and social behaviors. Jeffrey Young’s theory of Early Maladaptive Schemas (EMS) emphasizes developmental, cognitive, and relational patterns formed early in life that influence interpersonal functioning.
The SADNESS / PANIC / SEPARATION DISTRESS system is particularly pertinent to loneliness: it is activated by loss of social bonds and feelings of abandonment and involves neural substrates such as the anterior cingulate cortex and periaqueductal gray; neurotransmitters implicated include opioids and oxytocin. The SEEKING system supports exploration and social approach; its downregulation may follow repeated social failure and contribute to withdrawal. The CARE system underpins caregiving and attachment and is relevant for maintaining social ties and belonging.
The study aimed to examine (1) associations between Panksepp’s primal emotional systems and the subjective sense of loneliness, (2) relationships between these emotional systems and early maladaptive schemas, and (3) whether schema domains statistically mediate the links between emotional systems and loneliness.
The sample comprised 323 participants aged 18 to 66 years (mean age M = 26.9). Measures used were:
Associations among emotional systems, maladaptive schemas (individual schemas and schema domains), and loneliness were examined statistically. Mediation analyses tested whether schema domains mediated the relationships between each primal emotional system and reported loneliness. The SEEKING system was treated as a system of particular interest because of its hypothesized role in social approach and motivation.
Most primal emotional systems, maladaptive schemas, and schema domains showed significant associations with the sense of loneliness; the exception was the SEEKING system, which did not show a significant direct association with loneliness.
The strongest direct associations with loneliness were observed for the SADNESS / PANIC / SEPARATION DISTRESS and FEAR systems.
Emotional–motivational systems were also associated with early maladaptive schemas. The systems with the strongest relationships to EMS were SADNESS / PANIC / SEPARATION DISTRESS, FEAR, RAGE, and PLAY.
Mediation analyses indicated that schema domains significantly mediated the relationships between primal emotional systems and loneliness for all systems except SEEKING, where no mediation effect was found.
Across the tested mediation models, the Disconnection/Rejection schema domain consistently emerged as the primary statistical mediator, suggesting that schemas reflecting unmet needs for belonging, love, and relational safety play a central intermediary role.
The pattern of findings supports an integrative account in which subcortical affective systems relate to cognitive–relational patterns formed early in development, and those schemas in turn relate to the subjective experience of loneliness. Stronger activity or sensitivity in the SADNESS / PANIC / SEPARATION DISTRESS and FEAR systems corresponded to higher loneliness, and these affective inclinations were linked to EMS domains that reflect vulnerabilities in attachment and belonging.
The leading mediator, the Disconnection/Rejection domain, contains schemas that represent expectations of abandonment, emotional deprivation, and lack of secure attachment. Its mediating role aligns with theoretical predictions that early relational deficits shape persistent cognitive–affective patterns that render individuals more prone to perceiving social isolation.
The lack of association and mediation for SEEKING suggests this system may not directly relate to perceived loneliness in the same way, or that its role is more complex and not captured by the measures or models used in this sample.
The study concludes that early maladaptive schemas—particularly the Disconnection/Rejection domain—statistically mediate relationships between several primal emotional systems and the sense of loneliness. These results point to the relevance of considering both biological affective predispositions and developmental schema-based cognitions when conceptualizing loneliness.
Implications include the potential utility of schema-focused interventions for individuals whose experience of loneliness is intertwined with entrenched expectations of rejection or deprivation; the findings also support further research integrating affective neuroscience and developmental schema models.
All relevant data for the study are publicly available from the OSF repository (DOI reported by the authors). Funding was provided by the International Society of Schema Therapy (Grant Award 2024). The authors declared no competing interests.