Oxytocin May Amplify Negative Maternal Recollections in Adults With Attachment Anxiety
Oxytocin, commonly known as the love hormone, may intensify painful childhood memories rather than ease them in adults who experience anxiety in close relationships. A new study published in Emotion suggests that the hormone can amplify negative feelings associated with early caregiving experiences, particularly among people who fear rejection or abandonment.
The research, titled “Attachment, Oxytocin, and Maternal Recollections: Further Evidence for the Salience Hypothesis,” challenges the popular view of oxytocin as a hormone that simply promotes love and emotional closeness. Instead, the findings suggest that for people with deeply rooted relationship insecurities, the same chemical associated with bonding may also bring painful memories and unresolved emotions into sharper focus.
Humans are born dependent on caregivers, and these early relationships help shape what psychologists call attachment styles. These patterns influence whether people expect others to be supportive, trustworthy and emotionally available. Over time, they contribute to internal working models that guide expectations and behavior in close relationships.
Adults with secure attachment generally expect others to be dependable and responsive. Those with anxious attachment strongly desire closeness but often worry about rejection or abandonment. People with avoidant attachment, meanwhile, tend to maintain emotional distance and minimize their need for intimacy as a way of protecting themselves from potential hurt.
Oxytocin is both a hormone and a neurotransmitter involved in childbirth, breastfeeding and social bonding. Animal studies have demonstrated its importance in maternal recognition of offspring and the ability to remember familiar members of a social group.
Early human research suggested that oxytocin could increase trust and cooperation, contributing to its reputation as a chemical that encourages positive social behavior.
However, more recent findings have challenged this simplified interpretation.
Researchers increasingly emphasize the social salience hypothesis, which proposes that oxytocin heightens sensitivity to socially meaningful information rather than consistently producing positive emotions.
According to this perspective, oxytocin may intensify both pleasant and unpleasant emotional experiences, depending on a person's expectations, previous experiences and social circumstances.
For example, experiments involving rodents have shown that oxytocin can strengthen fear responses following social defeat by a dominant animal. Such findings suggest that when social interactions are perceived as threatening, the hormone may increase vigilance rather than feelings of warmth or security.
The new study extends this line of research by examining how oxytocin influences adults' recollections of childhood experiences with their mothers.
How the new study was designed
Researchers at McGill University, led by Melissa Shemirani and Jennifer A. Bartz, investigated whether oxytocin changes the emotional content of memories involving early attachment relationships.
Their goal was to replicate and extend an earlier experiment conducted exclusively with men. The new study included 77 adults of different genders.
Participants attended two experimental sessions using a double-blind, placebo-controlled crossover design.
During one session, they received oxytocin through a nasal spray. During the other, they received a placebo spray.
Neither the participants nor the researchers conducting the sessions knew which substance was administered on a particular visit. This approach helped reduce the possibility that expectations would influence how participants recalled or described their experiences.
After allowing time for the nasal spray to take effect, the researchers presented participants with attachment-related cue words, including protect and upset.
Participants were asked to recall specific childhood events involving their mothers that corresponded to these prompts.
From the memories they identified, the researchers selected one positive and one negative experience for more detailed discussion.
Participants then spent several minutes describing each event aloud, explaining what had happened and how they had felt.
Their accounts were recorded and subsequently transcribed.
Independent evaluators who did not know which treatment participants had received assessed the transcripts for positive and negative emotional content.
Oxytocin's impact on anxious attachment
The clearest pattern emerged among participants with higher levels of attachment anxiety.
After receiving oxytocin, these individuals described their mothers using more negative and less positive language than they did after receiving the placebo.
The findings suggest that oxytocin may increase the emotional prominence of negative caregiving experiences among people who already tend to fear rejection, abandonment or inconsistent emotional support.
Rather than simply encouraging feelings of closeness, the hormone appeared to intensify interpretations consistent with participants' existing attachment-related concerns.
This pattern supports the social salience hypothesis, which proposes that oxytocin increases the psychological significance of social information rather than producing uniformly positive emotional effects.
For individuals who expect disappointment or insecurity in close relationships, this heightened sensitivity may make painful memories and negative interpretations more prominent.
To supplement the human evaluations, the researchers also examined the transcripts using two automated language-analysis methods.
One approach identified emotional words using an extensive dictionary, while the other considered grammatical structure and context to assess how emotional expressions were used.
These analyses provided an additional perspective on the emotional content of participants' recollections.
The automated results generally supported the idea that attachment anxiety influenced responses to oxytocin, although the strongest patterns differed from those identified by human raters.
In the computerized analyses, the most pronounced changes appeared among participants with relatively low attachment anxiety. For these individuals, oxytocin was associated with less negative language when recalling childhood experiences.
The discrepancy suggests that human evaluators and automated systems may capture different aspects of emotional expression, particularly when personal memories contain complex or mixed feelings.
Avoidant attachment and emotional distance
The researchers also examined whether oxytocin affected participants with higher levels of avoidant attachment.
People with this attachment pattern often minimize their need for closeness and may become uncomfortable when situations require emotional vulnerability.
Unlike participants with elevated attachment anxiety, those with higher avoidance did not show substantial changes in the emotional content of their childhood recollections after receiving oxytocin.
However, another difference emerged in how they experienced the experimental task.
After discussing their memories, participants completed questionnaires assessing how much they had disclosed and how comfortable they felt sharing personal information.
Those with higher attachment avoidance reported greater reluctance to open up after receiving oxytocin than after receiving the placebo.
This finding suggests that oxytocin may heighten defensive responses in people who are already uncomfortable with emotional intimacy.
Rather than making personal disclosure feel easier, the hormone may increase sensitivity to vulnerability and reinforce the desire to maintain emotional distance.
Such a response would be consistent with an attachment pattern characterized by efforts to avoid dependence and protect against possible rejection.
By contrast, participants with lower attachment avoidance generally reported greater willingness to share personal experiences, regardless of whether they received oxytocin or placebo.
Together, these findings suggest that the psychological effects of oxytocin may depend partly on established relationship expectations and individual strategies for managing emotional closeness.
Limits, caveats and future questions
The study has several limitations that should be considered when interpreting its findings.
First, the researchers focused exclusively on childhood memories involving mothers, reflecting the emphasis on maternal caregiving in earlier attachment research.
It remains unclear whether similar effects would emerge when participants recalled experiences with fathers, grandparents or other important caregivers.
The sample was also relatively small, young and composed largely of White and Asian participants.
Because cultural expectations surrounding parenting, emotional expression and close relationships vary, larger and more diverse studies are needed to determine whether the findings apply to other populations.
Another limitation concerns the differences between human ratings and automated language analyses.
Personal memories frequently contain complicated combinations of positive and negative emotions. For example, someone recalling being comforted after a frightening experience may use many negative words even though the overall memory reflects emotional support and safety.
Automated systems may struggle to distinguish between the emotional tone of an event and the meaning a person assigns to it.
Spoken narratives introduce additional difficulties because everyday speech often includes interruptions, incomplete sentences, digressions and self-corrections.
Many language-analysis tools were originally developed for shorter or more structured written material, which may limit their accuracy when evaluating spontaneous personal accounts.
The researchers therefore emphasize the importance of combining different analytical approaches when studying complex emotional memories.
The findings also have potential clinical implications.
Oxytocin has attracted interest as a possible treatment for social and relationship difficulties, but the new results caution against assuming that administering the hormone will consistently improve emotional well-being.
For people with elevated attachment anxiety or strong avoidance tendencies, oxytocin may intensify distressing interpretations or discomfort with emotional disclosure.
This raises concerns about unsupervised use, particularly among individuals who already struggle with relationship insecurity.
Researchers are investigating whether carefully supervised oxytocin administration combined with psychotherapy could help people process difficult relational experiences.
However, such approaches would require rigorous clinical testing to establish their safety and effectiveness and determine whether they might worsen symptoms in certain individuals.
For now, the study highlights the complex interaction between biology, early experiences and adult attachment patterns.
Oxytocin may play an important role in social bonding, but its psychological effects appear to depend on the emotional meaning people assign to their relationships and memories. Rather than acting as a universal love hormone, it may amplify the feelings and expectations that individuals already bring into emotionally significant situations.
Article prepared by Victoria Caldwell.
