Oxytocin

Oxytocin

• ein Neuropeptide, welches die Bindung zwischen Lebewesen verstärkt

Beeinflusst folgende Verhaltensweisen

Soziales Verhalten

• Soziales Verhalten (meistens in Lebewesen, die ohnehin zu prosoziales Verhalten tendieren, dabei hat ein höheres Oxytocin-Level keine Auswirkungen auf unsoziale Menschen)
• die prosizalen Effekte innerhalb von Gruppen kann dazu führen, dass sich die Gruppenmitglieder negativ gegenüber Außenstehenden verhalten → Gruppenverhalten
• Lebewesen mit dauerhaft erhöhtem Vasopressin-Level haben stabilere monogame Beziehungen, engagiertere Erziehungen, können sich besser in andere hineinversetzen, sind empathischer

Eltern-Kind-Bindung

Bindung der Mutter zum Kind

monogamische Verbindung

Andere Verbindungen

• Vertrauen
• Empathy
• Großzügigkeit
• Emotionale Intelligenz

Transclude of Genvarianten-von-Oxytocin-und-Vasopressin#genvarianten-von-oxytocin-und-vasopressin

Warnungen

• die Neuropeptiden Vasopressin und Oxytocin fördern manchmal ein Verhalten von “soziale Informationen sammeln” anstatt sich selbst sozial zu verhalten (man muss wissen, dass es diese Verhaltensweisen gibt)

von Behave

Oxytocin prepares the body of a female mammal for birth and lactation; logically, oxytocin also facilitates maternal behavior.

Infuse oxytocin into the brain of a virgin rat, and she’ll act maternally.

What predicted high levels of oxytocin in males? Lots of sex.

circulating oxytocin levels are elevated in couples when they’ve first hooked up. Furthermore, the higher the levels, the more physical affection, the more behaviors are synchronized, the more long-lasting the relationship, and the happier interviewers rate couples to be.
(p.106)

Men in a stable relationship, oxytocin increased the distance to another woman by 4-6 inches.

Give dogs oxytocin, and they gaze longer at their humans … which raises the humans’ oxytocin levels. The same in mother-child relationships.

oxytocin inhibits the central amygdala, suppresses fear and anxiety, and activates the “calm, vegetative” parasympathetic nervous system.
(p.107)
people rate faces as more trustworthy, and are more trusting in economic games, when given oxytocin.
So oxytocin elicits prosocial behavior, and oxytocin is released when we experience prosocial behavior.
Oxytocin makes you more prosocial to people like you (i.e., your teammates) but spontaneously lousy to Others who are a threat.
Oxytocin, the luv hormone, makes us more prosocial to Us and worse to everyone else. That’s not generic prosociality. That’s ethnocentrism and xenophobia. In other words, the actions of these neuropeptides depend dramatically on context.

🤖 AI addition (15/06/26):

Synthesis and Release

Oxytocin is a 9-amino-acid Neuropeptide synthesized in the hypothalamus — primarily in:

• Paraventricular nucleus (PVN): projects to posterior pituitary AND sends axons throughout the brain
• Supraoptic nucleus (SON): primarily for peripheral (hormonal) release

3D structure of oxytocin from NMR solution — the cyclic 9-amino-acid ring (via disulfide bond between Cys1 and Cys6) with C-terminal amide tail

Oxytocin functions in two distinct modes:

Mode	Route	Targets
Hormone	Posterior pituitary → bloodstream	Uterus (contractions), mammary glands (milk letdown)
Neuropeptide	PVN axons projecting into brain	Amygdala, NAc, hippocampus, brainstem

Peripheral oxytocin cannot cross the blood-brain barrier in significant amounts — behavioral effects rely on centrally released oxytocin. This is why intranasal oxytocin (which reportedly reaches the brain via olfactory/trigeminal pathways) has been used in research, though its actual brain penetration is debated.

Release triggers: Suckling, vaginal distension (Ferguson reflex during birth), sexual activity, skin-to-skin contact, positive social interaction, eye contact (esp. with dogs — see Behave notes above).

OXTR: The Oxytocin Receptor

The OXTR gene encodes the oxytocin receptor — a Gq-coupled GPCR. Its distribution in the brain determines the behavioral output of oxytocin:

Brain region	Effect of oxytocin
Amygdala	↓ fear, ↓ anxiety, ↓ threat salience
Nucleus accumbens (NAc)	↑ reward salience of social stimuli → social bonding
Hippocampus	Social memory consolidation
PFC / ACC	Trust, social cognition
Brainstem	Parasympathetic calming

OXTR density in the NAc is a key determinant of pair-bonding in voles (same axis as Vasopressin V1a receptors).

”Social Salience” — Not Just Prosociality

Modern reframing: oxytocin is not simply a “love hormone” — it is a social salience signal that increases attention to and encoding of social stimuli, whether positive or negative:

• Amplifies in-group bonding AND out-group hostility (as the Behave quotes above show)
• Can increase envy and schadenfreude in certain contexts (Shamay-Tsoory et al., 2009)
• In autism spectrum disorder (ASD), OXTR polymorphisms and reduced oxytocin signaling are associated with reduced social motivation
• Nasal oxytocin in ASD trials: mixed results; beneficial when baseline social motivation is present, neutral or adverse when it is not

Epigenetic Regulation of OXTR

Early-life experience shapes OXTR expression via epigenetics:

• Maternal deprivation → increased OXTR methylation → reduced receptor expression → blunted oxytocin signaling in adulthood
• Early secure attachment → lower OXTR methylation → more responsive oxytocin system
• This mechanism links early social environment to adult social bonding capacity — a biological embedding of attachment experience

Research Caveats on Nasal Oxytocin

Much popular media overstates nasal oxytocin findings:

• Standard intranasal dose (24 IU) may not reliably reach the brain in humans; pharmacokinetic evidence is weak
• Many early positive studies had small samples and publication bias
• Large-scale replications (e.g., Walum et al., 2016) often fail to replicate single-dose prosocial effects
• Context (relationship quality, personality, disorder) heavily moderates effects
• Conclusion: oxytocin as a biological system is robustly important; intranasal oxytocin as a clinical tool remains unproven for most applications

See also

Status:
Tags: HormoneNeurotransmitter science ai-generated
Superlink: 052 🫧Hormone und Neurotransmitter 051 ☣Neurobiology
Bindung der Mutter zum Kind, 050 🧠Neuroscience

Quellen

[[Behave#Chapter 4 Hours to Days Before#Oxytocin and Vasopressin A Marketing Dream]]

→ Einordnung: Neurotransmitter vs Neuropeptide vs Hormone · Hormone – Overview · Neuropeptide · Vasopressin

Erstellt: 19-08-21 12:11