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Sensory Cue (sensory + cue)
Selected AbstractsResponse to Male Odours in Progestin Receptor- and Oestrogen Receptor-Containing Cells in Female Rat BrainJOURNAL OF NEUROENDOCRINOLOGY, Issue 6 2002A. L. Bennett Abstract Sensory cues from male rats, such as odours and vaginal-cervical stimulation (VCS), play a modulatory role in female rat sexual behaviour. For example, exposure to male odours and VCS appears to be at least partially responsible for increases in sexual behaviour following repeated mating of oestradiol-primed female rats. Although there is evidence that VCS influences sexual behaviour via a ligand-independent progestin receptor (PR)-dependent mechanism, the mechanism by which odours influence sexual behaviour is not known. We tested the hypothesis that, similar to VCS, the effects of male odours on sexual behaviour are mediated by progestin receptors. Female rats were injected with the progestin antagonist, RU486, or oil vehicle and were then exposed to male-soiled bedding or clean bedding. Although exposure to male-soiled bedding resulted in higher levels of Fos immunoreactivity in brain areas associated with female sexual behaviour, the progestin antagonist did not reduce this effect. Furthermore, there was minimal coexpression of odour-induced Fos and progestin receptors in brain areas associated with female sexual behaviour. Together, these results suggest that the effects of male odours are not mediated by a PR-dependent mechanism. Therefore, we tested the hypothesis that oestrogen receptor (ER)-containing cells are involved in the effects of olfactory cues. Although there was virtually no coexpression of ER, and odour-induced Fos in brain areas associated with female sexual behaviour, exposure to male odours slightly increased the number of cells coexpressing ER, and odour-induced Fos in the posterodorsal medial amygdala. Although, these results do not support the hypothesis that the effects of odours are mediated by a PR-dependent mechanism, they suggest that integration of male odours and hormonal cues may occur in ER,-containing cells in the posterodorsal medial amygdala. [source] Cognitive and Physiological Determinants of Symptom Perception and InterpretationJOURNAL OF APPLIED BIOBEHAVIORAL RESEARCH, Issue 1 2008Motohiro Nakajima The purpose of the current study was to test the aspects of MacGregor and Fleming's model of symptom reporting and illness interpretation. Participants were randomly assigned to cognitive cue (Chemical or No Chemical), sensory cue (Odor or No Odor), and somatic arousal (Exercise or No Exercise) conditions. The findings suggested that although somatic arousal primarily determines whether one experiences symptoms, and expectations,or one's mental model,determine the nature of the attribution regarding the cause of the symptoms, it appears that both the attribution about the cause of the symptoms and the amount of somatic arousal experienced combine to produce the intensity of negative symptoms. [source] Early Responsiveness to Stimuli Paired With Different Stages Within the State of Alcohol IntoxicationALCOHOLISM, Issue 5 2002Ricardo M. Pautassi Background: Infant rats quickly learn to avoid a sensory cue paired with alcohol as an unconditioned stimulus, particularly when the drug reaches peak blood concentrations. In this study, a tactile cue paired with the onset of alcohol intoxication preceded subsequent presentations of a gustatory conditioned stimulus (CS). The goal was to address the possibility of differential conditioning depending on when stimuli were introduced during the course of the toxic state. Methods: In experiment 1, rat pups received sequential presentations of a salient texture (sandpaper) and a gustatory cue (saccharin) while intoxicated with a 2.5 g/kg alcohol dose or after receiving saline. Texture location tests and saccharin intake assessments were then performed. A third modality of assessment was defined by a saccharin intake test while pups simultaneously experienced sandpaper. In experiment 2, alcohol-mediated conditioning was followed by tests similar to those of experiment 1, but after pups were re-exposed to either the tactile CS or the alcohol-unconditioned stimulus. Results: Conditioned taste aversions, due to pairing saccharin and the later stage of alcohol intoxication, were reliably established in both experiments. Also in both experiments, this excitatory aversive response was dramatically inhibited when the association between the texture CS and the earlier stage of alcohol intoxication was activated. There were no indications of conditioned motor responses to the tactile CS that might compete with intake behavior of saccharin or distort measurement of an appetitive memory derived from pairing the texture and the earlier stage of intoxication. Conclusions: Rat pups' expression of an association between a taste signaling aversive consequences of alcohol was eliminated by the presence of a tactile stimulus that originally had signaled the absence of aversive consequences of alcohol intoxication. The results suggest the interaction of inhibitory and excitatory conditioning involving the aversive properties of alcohol. [source] Ecological correlates of infraorbital foramen area in primatesAMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY, Issue 1 2010Magdalena N. Muchlinski Abstract The infraorbital foramen (IOF) transmits the infraorbital nerve (ION) to specialized sensory cells (mechanoreceptors) in the maxillary region. The size of the IOF has been used in numerous paleoecological interpretations of the fossil record. However, these interpretations have been applied without an explicit analysis of the relationship between ecological variables and the IOF. ION and IOF cross-sectional area show a strong positive correlation. As a result, IOF area can be a proxy for ION area, and it is hypothesized that IOF area may be a good measure for maxillary somatosensory acuity. Differences in diet, substrate preference, and/or activity pattern have been shown to correlate with differences in maxillary somatosensory acuity among mammals. This study examines how IOF area covaries with different ecological variables. IOF area was measured for 89 primate species. Ecological profiles were also created for each species and used to evaluate interspecific variation in relative IOF area within each ecological category. The results show a significant relationship between relative IOF area and diet, but not substrate preference or activity pattern. Frugivores have significantly larger relative IOFs than either folivores or insectivores, but the relative IOFs of folivores and insectivores do not differ significantly from one another. These results partially support the hypothesis that maxillary mechanoreception is a critical sensory cue for primates within a feeding context. Results for this study suggest the IOF can be used as an informative character in some paleoecological interpretations of the primate fossil record. Am J Phys Anthropol, 2010. © 2009 Wiley-Liss, Inc. [source] Unexplained infant crying: an evolutionary perspective,ACTA PAEDIATRICA, Issue 5 2002MA Hofer The absence of adverse health outcomes later in development and the similarity of defining features of "colic" across cultures suggest that an evolutionary perspective may give us some insight into the nature of this puzzling condition. Evidence suggests that the larynx evolved first as a protective valve and later as a means to stabilize the upper thorax momentarily for precision upper arm movements. Recently, we found another physiological role for the larynx in regulating respiratory function to promote the recovery of young rats from severe hypothermia. In the process, bursts of calling were emitted by unconscious pups, which were nevertheless effective in eliciting maternal search and retrieval. These unexpected findings reveal how infant calling may have evolved as a communicative signal derived from more primitive physiological functions of the larynx. Repetitive calling in the normal young rat when isolated from its littermates and mother is regulated by multiple sensory cues present in the infant's social interactions, and in the paper it is described how this sensory input projects to central neuromodulatory systems known to be active in the control of anxiety behaviors in adult rats and humans. Conclusion: This broad range of functions for infant calling in other mammals suggests several new ways to approach the further study and treatment of unexplained crying in human infants. [source] | ||||||||||