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PubMed1999

Neurobiology of sexual behavior.

Recent advances in the neurobiology of sexual behavior have helped to refine our understanding of the neuroanatomical, neuroendocrine and neurochemical systems that modulate responses to sexual stimulation. Both appetitive and consummatory sexual behaviors have been studied in several laboratory species and in humans using traditional and novel behavioral paradigms. New knowledge has emerged concerning the role of hypothalamic, limbic and brainstem structures, neuropeptides, brain monoamines and nitric oxide in the control of partner preference, sexual desire, erection, copulation, ejaculation, orgasm and sexual satiety. Brain imaging of visually evoked sexual arousal in humans has also been examined.

Animals↗
PubMed2003

Neuromuscular modulation in Aplysia. I. Dynamic model.

Many physiological systems are regulated by complex networks of modulatory actions. Here we use mathematical modeling and complementary experiments to study the dynamic behavior of such a network in the accessory radula closer (ARC) neuromuscular system of Aplysia. The ARC muscle participates in several types of rhythmic consummatory feeding behavior. The muscle's motor neurons release acetylcholine to produce basal contractions, but also modulatory peptide cotransmitters that, through multiple cellular effects, shape the contractions to meet behavioral demands. We construct a dynamic model of the modulatory network and examine its operation as the motor neurons fire in realistic patterns that change gradually over an hour-long meal and abruptly with switches between the different feeding behaviors. The modulatory effects have very disparate dynamical time scales. Some react to the motor neuron firing only over many cycles of the behavior, but one key effect is fast enough to respond to each individual cycle. Switches between the behaviors are therefore followed by rapid relaxations along some modulatory dimensions but not others. The trajectory of the modulatory state is a transient throughout the meal, ranging widely over regions of the modulatory space not accessible in the steady state. There is a pronounced history-dependency: the modulatory state associated with a cycle of a particular behavior depends on when that cycle occurs and what behaviors preceded it. On average, nevertheless, each behavior is associated with a different modulatory state. In the following companion study, we add a model of the neuromuscular transform to reconstruct and evaluate the actual modulated contraction shapes.

Animals↗
PubMed2006

Role of glutamate receptors in the ventromedial hypothalamus in the regulation of female rat sexual behaviors. II. Behavioral effects of selective glutamate receptor antagonists AP-5, CNQX, and DNQX.

Bilateral infusions of glutamate or its selective ionotrophic receptor agonists to the ventromedial hypothalamus (VMH) produce a rapid inhibition of both appetitive and consummatory sexual behavior in hormone-primed female rats. The present study examined whether infusion of selective ionotrophic glutamate receptor antagonists to the VMH can facilitate female sexual behavior in females treated with estradiol benzoate (EB) and progesterone (P), or EB alone. Ovariectomized, sexually experienced female rats were implanted bilaterally with guide cannulae aimed at the ventrolateral VMH. After recovery from surgery, females were primed either with EB+P or EB alone, and infused with saline, or one of two doses each of AP-5 (to target NMDA receptors), CNQX, or DNQX (to target AMPA/kainate receptors), immediately before tests with sexually vigorous male rats in bilevel chambers. In general, the drug infusions had a more powerful effect in females primed with EB alone compared to females primed with EB+P. AP-5 increased lordosis in females primed with EB alone. CNQX had a similar facilitative effect on lordosis, and also increased solicitations. DNQX increased solicitations in both hormone-priming conditions, increased lordosis quotients and magnitudes, and decreased pacing and defensive responses in the EB-alone condition. These results indicate that antagonism of glutamate receptors in the VMH resembles the effect of P, and that the addition of P to an EB baseline eliminates most of the effects of glutamate receptor antagonists. These data support the notion that glutamate receptors in the VMH contribute a strong inhibitory influence in the control of female sexual behavior.

2-Amino-5-phosphonovalerate↗
PubMed1989

Premotor neurons in the feeding system of Aplysia californica.

Central pattern generator (CPG) circuits control cyclic motor output underlying rhythmic behaviors. Although there have been extensive behavioral and cellular studies of food-induced feeding arousal as well as satiation in Aplysia, very little is known about the neuronal circuits controlling rhythmic consummatory feeding behavior. However, recent studies have identified premotor neurons that initiate and maintain buccal motor programs underlying ingestion and egestion in Aplysia. Other newly identified neurons receive synaptic input from feeding CPGs and in turn synapse with and control the output of buccal motor neurons. Some of these neurons and their effects within the buccal system are modulated by endogenous neuropeptides. With this information we can begin to understand how neuronal networks control buccal motor output and how their activity is modulated to produce flexibility in observed feeding behavior.

Animals↗
PubMed1975

Tail pinch-induced eating, gnawing and licking behavior in rats: dependence on the nigrostriatal dopamine system.

Mild-tail-pinch induces a syndrome of eating, gnawing and licking behavior in rats in the presence of food. Detailed behavioral, pharmacological and biochemical analyses of this phenomenon resulted in the following conclusions. (1) This is an unusually reliable phenomenon, demonstrable in each of more than 200 animals tested. (2) Eating is by far the predominant response to tail-pinch. (3) Tail-pinch behavior is critically dependent on the nigrostriatal dopamine system. (4) There are striking pharmacological parallels between tail-pinch behavior and schizophrenia.

Animals↗
PubMed2006

Oviposition in Delia platura (Diptera, Anthomyiidae): the role of volatile and contact cues of bean.

The choice of a suitable oviposition site by female insects is essential for survival of their progeny. Both olfactory and contact cues of the oviposition site may mediate this choice. The polyphagous Delia platura (Diptera: Anthomyiidae), a severe agricultural pest of numerous crops, lays eggs in the soil close to germinating seeds. Maggots feed upon the cotyledons. Only little is known about the cues guiding oviposition behavior. In this study, the effects of both olfactory and contact cues of beans (Phaseolus vulgaris) on oviposition of D. platura females were tested. Egg deposition on germinated beans was preferred to egg deposition on ungerminated beans or on beans in different postgerminating developmental stages. Olfactory cues of germinating beans alone stimulated female flies to lay eggs. Additional contact cues of germinating beans seemed to enhance the response, but the difference was not significant. Surface extracts of germinating beans sprayed on surrogate beans showed that both polar and nonpolar substances stimulated oviposition of D. platura flies. Gas chromatography-electroantennographic detection recordings of head space samples of germinating beans showed positive response of females to different compounds. We conclude that olfaction plays a major role when D. platura females are searching for oviposition sites. Volatile compounds released from germinating beans such as 4-hydroxy-4-methyl-2-pentanone, 1-hepten-3-one, 1-octen-3-ol, and 3-octanone should be considered as key compounds that mediate oviposition behavior. The use of different sensory modalities by closely related species of Delia is discussed.

Animals↗
PubMed2001

Anxiolytic-like effects of AP7 injected into the dorsolateral or ventrolateral columns of the periaqueductal gray of rats.

RATIONALE: Glutamate antagonists microinjected into the dorsolateral PAG (DLPAG) show an anxiolytic-like profile in the elevated plus maze. Other columns of the PAG are also involved in defensive reactions. Few studies, however, have investigated the effects of pharmacological manipulation of the ventrolateral PAG (VLPAG) on procedures that predict anxiolytic activity. OBJECTIVES: To investigate the effects of the NMDA receptor (NMDAr) antagonist 2-amino-7-phosphonoheptanoic acid (AP7) microinjected into the DL or VLPAG in two procedures that predict anxiolytic activity using distinct aversive contingencies, the elevated plus maze and the Vogel punished licking test. METHODS: Male Wistar rats (7-14/group) with cannulas aimed at the DLPAG or VLPAG received AP7 (2 nmol/0.5 microl) or saline and 10 min later were submitted to the behavioural tests. In the punished licking experiment, water deprived (48 h) animals were allowed to drink for 3 min, receiving a 0.5 mA shock every 20 licks. The elevated plus maze test was performed as described elsewhere. Using this test, a dose response-curve for AP7 (0.2-20 nmol) injected in a smaller volume (0.25 microl) into the VLPAG was also performed. RESULTS: AP7 increased exploration of open arms of the EPM when microinjected into either the DLPAG or VLPAG ( P<0.05, ANOVA). The drug also increased the number of punished licks when administered into those columns (ANOVA, P<0.05). CONCLUSIONS: The results suggest that antagonism of endogenous excitatory amino acid neurotransmission in the DLPAG or VLPAG is able to reverse behavioral suppression induced by distinct aversive contingencies.

2-Amino-5-phosphonovalerate↗
PubMed1994

Health effects of water restriction to motivate lever-pressing in rats.

The objectives were to determine the degree of water restriction necessary and sufficient to motivate operant behavior in rat and the physiologic and general health effects of chronic daily water restriction. Ovariectomized Long-Evans rats were deprived of water for 21, 14, or 7 h per day and allowed to press a lever to earn a drop of water. The 21-h group acquired the response, but the 14-h and 7-h groups did not. Once the response was acquired, all three restriction levels supported lever pressing, but the lower levels supported lower rates. After 3 months on the restriction schedules, there were no differences from similarly restricted nonbehavioral subjects or ad-libitum controls in growth rate (except for early transient weight loss), appearance of organs and tissues at gross necropsy, hematologic examination, or clinical chemical analysis. The results demonstrate the necessity and safety of the 21-h restriction schedule for behavioral work.

Analysis of Variance↗
PubMed2003

Roost selection by Formosan leaf-nosed bats (Hipposideros armiger terasensis).

Patterns of roost use by Formosan leaf-nosed bats (Hipposideros armiger terasensis) were studied from November 1998 to April 2000. Structural characteristics, microclimates, and disturbance levels of 17 roosts used by H. a. terasensis and 15 roosts either used by other bat species (2) or not occupied by any bat species were compared. Roosts used by these bats were significantly larger in size and had greater areas covered by water compared to unused roosts. Entrances of active roosts were more likely to be east-west oriented. Hibernacula had lower entrances and ceilings than did roosts used only in summer. Higher temperatures were recorded in non-breeding roosts than in breeding roosts, but temperature gradients in these two types of roosts did not differ. In winter, hibernacula were warmer, and the temperature fluctuated less than in non-hibernacula. The relative humidities in summer roosts and hibernacula were nearly 100%. Disturbance levels were significantly higher in non-breeding roosts than in breeding roosts, and in non-hibernacula than in hibernacula. These results suggest that the Formosan leaf-nosed bats are selective of their roosts, but the pattern of their roost selection differs from those reported for bats of temperate regions. The reasons for such differences may be related to differences in body size, behavior, and reproductive strategy of the Formosan leaf-nosed bats living in a subtropical climate in Taiwan.

Animals↗
PubMed1991

Independence of memory functions and emotional behavior: separate contributions of the hippocampal formation and the amygdala.

Structures and connections in the medial temporal lobe of humans and nonhuman primates have long been recognized as important for normal memory and emotional behavior. The present study investigated memory and emotional behavior in normal monkeys and six groups of monkeys with lesions of the medial temporal lobe. Two groups had damage to the hippocampal formation (or adjacent perirhinal and parahippocampal cortex) but not the amygdaloid complex; two groups had either partial or complete damage to the amygdaloid complex but not the hippocampal formation; and two groups had damage to both the hippocampal formation and the amygdaloid complex. Memory was evaluated with three tasks sensitive to human amnesia: (1) delayed nonmatching to sample; (2) retention of object discriminations; and (3) concurrent discrimination learning. Emotional behavior was assessed by measuring the responsiveness of monkeys to 12 different stimulus situations. Damage to the hippocampal formation or anatomically related cortex impaired memory but did not affect emotional behavior. Partial or complete damage to the amygdaloid complex affected emotional behavior but not memory. These findings show that memory impairment and abnormal emotional behavior are anatomically dissociable and independent effects of damage to the medial temporal lobe.

Amygdala↗
PubMed2005

The role of dopamine in reinforcement: changes in reinforcement sensitivity induced by D1-type, D2-type, and nonselective dopamine receptor agonists.

Dose-dependent changes in sensitivity to reinforcement were found when rats were treated with low, moderate, and high doses of the partial dopamine D1-type receptor agonist SKF38393 and with the nonselective dopamine agonist apomorphine, but did not change when rats were treated with similar doses of the selective dopamine D2-type receptor agonist quinpirole. Estimates of bias did not differ significantly across exposure to SKF38393 or quinpirole, but did change significantly at the high dose of apomorphine. Estimates of goodness of fit (r2) did not change significantly during quinpirole exposure. Poor goodness of fit was obtained for the high doses of SKF38393 and apomorphine. Decrements in absolute rates of responding were observed at the high dose of quinpirole and at the moderate and high doses of SKF38393 and apomorphine. Changes in r2 and absolute responding may be due to increases in stereotyped behavior during SKF38393 and apomorphine exposure that, in contrast to quinpirole, were distant from the response lever. The present data provide evidence that sensitivity to reward is affected more strongly by dopamine D1-like receptors rather than D2-like receptors, consistent with evidence from other studies investigating consummatory dopamine behavior and the tonic/phasic dopamine hypothesis.

2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-ben↗