Christopher L. Robison

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Corticotropin-releasing hormone (CRH) is believed to play an important role in the regulation of behavioral responses to stress. CRH(1) receptor antagonists may reduce stress responsivity. Stress increases CRH in the amygdala, important in memory consolidation. We hypothesized that infusion of a CRH(1) antagonist into the amygdala following social defeat(More)
Dopamine in the medial preoptic area (mPOA) stimulates sexual activity in males. This is evidenced by microdialysis and microinjection experiments revealing that dopamine receptor antagonists in the mPOA inhibit sexual activity, whereas agonists facilitate behavior. Microdialysis experiments similarly show a facilitative role for dopamine, as levels of(More)
Long-term individual housing increases aggressive behavior in mice, a condition termed isolation-induced aggression; this aggressiveness is reduced by some antidepressants and anxiolytics. NMDA antagonists also inhibit isolation-induced aggression in mice. The enzyme N-acetylated-α-linked acidic dipeptidase (NAALADase) hydrolyzes the neurotransmitter(More)
In mice, the neuropeptide arginine-8-vasopressin (AVP) induces excessive grooming, scratching, and hyperactivity when administered intracerebroventricularly. In hamsters, AVP infusion into the medial preoptic area/anterior hypothalamus (MPOA/AH) increases flank marking and flank mark grooming. We measured the behavioral effects of administration of AVP (0,(More)
Repeated restraint stress in rodents impairs spatial memory in a Y-maze test and induces hippocampal neuronal changes that last up to 5 d after the stressor ends. Our goal was to implement a Barnes maze spatial memory test in mice that could be used to validate our findings of social stress induced Y-maze impairment. We measured performance of mice in 5-(More)
The transcription factor deltaFosB (ΔFosB) is induced in the nucleus accumbens (NAc) by repeated exposure to drugs of abuse and natural rewards. Less is known about its role in other brain areas. Here, we compared the effects of mating versus cocaine history on induction of ΔFosB in the medial preoptic area (MPOA), an integral site for reproductive(More)
The hypothalamus contains numerous nuclei involved in the regulation of reproductive, stress, circadian, and homeostatic behaviors, with many of these nuclei concentrated within the preoptic and anterior regions. The gaseous neurotransmitter, nitric oxide (NO), has already been shown to have an important regulatory role within the medial preoptic area(More)
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