FEAR-ESB leads animals to flee, whereas much weaker stimulation elicits a freezing response. Humans stimulated in these same brain regions report being engulfed by an intense free-floating anxiety that appears to have no environmental cause. Key chemistries that regulate this system are Neuropeptide Y and corticotrophin releasing factor (CRF); anti-anxiety agents such as the benzodiazepines Inhibitors,research,lifescience,medical inhibit this system by facilitating GABA transmission. The LUST/sexual systems Sexual LUST,28 mediated by specific brain circuits and chemistries, distinct
for males and females, is aroused by male and female sex hormones, which control many brain chemistries including two “social neuropeptides” – oxytocin transmission is promoted by estrogen in females and vasopressin transmission by testosterone in males. These brain chemistries help create gender-specific sexual tendencies. Oxytocin promotes sexual readiness Inhibitors,research,lifescience,medical in females, as well as trust and confidence, and vasopressin promotes assertiveness, and perhaps jealous behaviors, in males. Distinct male and female sexual tendencies are promoted by these steroid hormones early in
life, with sexual activation by gonadal hormones at puberty. Because brain and bodily sex characteristics Inhibitors,research,lifescience,medical are independently organized, it is possible for animals that are externally male to have female-typical sexual urges and, others with female external characteristics to have maletypical sexual urges. The dopamine-driven SEEKING system participates in the search for sexual rewards just as for all other types of rewards, including those relevant for the other social-emotional systems described below. The CARE/maternal Inhibitors,research,lifescience,medical nurturance system Brain evolution has provided safeguards to assure that parents (usually the mother) take care of offspring. Some of the chemistries of sexuality, for instance oxytocin, have been evolutionarily redeployed to Inhibitors,research,lifescience,medical mediate maternal care – nurturance and social bonding – suggesting there is an intimate evolutionary relationship between female sexual rewards and maternal motivations.29 The shifting hormonal tides at the end of pregnancy (declining progesterone,
and increasing estrogen, prolactin, and oxytocin) invigorate maternal urges days before the young are born. until This collection of hormonal and associated neurochemical changes also help assure strong maternal bonds with offspring. The GRIEF/separation distress system system was initially called the PANIC system, but few understood the intent of that primary-process terminology, so we shifted to the more comprehensible tertiary-process term of GRIEF30 (highlighting once more terminological problems in emotion research: what are the differences between the tertiary-level emotions of bereavement, grief, and mourning, for instance?). In any event, young socially selleck screening library dependent animals have powerful emotional systems to solicit nurturance.
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