Oxytocin administered centrally facilitates formation of a partner preference in female prairie voles (Microtus ochrogaster).
Level 5 - mechanism / opinion, no new human data
Animal research (preclinical model)
PubMed 7920590 · doi:10.1111/j.1365-2826.1994.tb00579.x
What was done
Ovariectomized female prairie voles (Microtus ochrogaster) were implanted with osmotic minipumps delivering oxytocin (1–100 ng/h) or artificial cerebrospinal fluid (CSF) via intracerebroventricular or subcutaneous routes. Females cohabited with a male partner for 6 hours without mating and were subsequently evaluated in a partner preference test between the familiar partner and an unfamiliar male. Additional groups received central infusions of a selective oxytocin receptor antagonist alongside exogenous oxytocin.
What was found
Centrally administered oxytocin at doses of 10 or 100 ng/h significantly facilitated partner preference formation compared to CSF controls. Subcutaneous (peripheral) administration of oxytocin failed to induce partner preference. Central administration of an oxytocin receptor antagonist blocked the partner preference induced by exogenous oxytocin. The abstract reports directional findings and dosage thresholds but does not report exact numerical metrics, sample sizes, or p-values.
Why it matters
This study provides experimental evidence that central oxytocin signaling mediates partner preference formation in a monogamous mammal, establishing a neuroendocrine mechanism for pair bonding independent of mating.
Limits
The study was conducted entirely in an animal model (female prairie voles), limiting direct translation to human social attachment. Total animal counts, group sizes, statistical effect sizes, and exact preference durations are not reported in the abstract. The study examined only ovariectomized females and did not evaluate long-term maintenance of the pair bond beyond the immediate post-infusion preference test.
Cited by
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