Role of the amygdala in the reproductive and aggressive behavior of the lizard, Anolis carolinensis

  title={Role of the amygdala in the reproductive and aggressive behavior of the lizard, Anolis carolinensis
  author={N. Greenberg and M. Scott and D. Crews},
  journal={Physiology \& Behavior},
Thirteen male green anole lizards were lesioned in the ventromedial nucleus (VMN) of the posterior dorsal ventricular ridge ("amygdala") and/or the paleostriatum (PS) to determine the influence of these structures on assertion and challenge displays addressed to male intruders, or courtship displays and copulatory neckgrip directed toward females. Lesions that affected both VMN and PS reduced or eliminated both challenge and courtship displays as well as the neckgrip, a crucial component in… Expand
Seasonal and Sexual Dimorphisms in the Green Anole Forebrain
The results indicate that T can stimulate behavior in the nonbreeding season and suggest that a dissociation exists between the regulation of the courtship display and soma size of relevant brain regions. Expand
Role of the Archistriatal Nucleus taeniae in the Sexual Behavior of Male Japanese Quail (Coturnix japonica): A Comparison of Function with the Medial Nucleus of the Amygdala in Mammals
The results suggest that Tn influences a wide range of behavioral functions in response to sexual stimuli, and indicate a function for this nucleus similar to that subserved by the Me in mammals, and strengthen the argument that these sex-steroid accumulating cell groups are homologous. Expand
Facilitation of courtship behavior in the male red-sided garter snake (Thamnophis sirtalis parietalis) following lesions of the septum or nucleus sphericus
These results are the first to demonstrate a central inhibitory control of sexual behavior in a snake. Expand
Courtship and copulation in the adult male green anole: Effects of season, hormone and female contact on reproductive behavior and morphology
Changes in behavior and neural and/or muscular morphology are not always parallel and differences in responsiveness to T exist across seasons and among tissues. Expand
Dissociated functional pathways for appetitive and consummatory reproductive behaviors in male Syrian hamsters
A double dissociation in the functional connections required for attraction to volatile sexual odors and copulation is demonstrated and suggested, more broadly, that appetitive and consummatory reproductive behaviors are mediated by distinct neural pathways. Expand
Sex and seasonal differences in morphology of limbic forebrain nuclei in the green anole lizard
Examination of sex and seasonal differences in estimated brain region volume and total neuron number in the preoptic area, AMY, and the ventromedial hypothalamus suggests the structure of limbic brain regions is dynamic in adulthood and that parallels between morphology and the expression of masculine behavior exist for the POA, whereas other relationships are more complicated. Expand
Androgen receptor expression and morphology of forebrain and neuromuscular systems in male green anoles displaying individual differences in sexual behavior
Higher levels of male courtship behavior result in (or are the result of) enhanced courtship muscle and amygdala morphology, and that androgen-sensitive tissue in studs may be more responsive to testosterone than duds, however, some mechanism(s) other than androgen receptor expression likely confer this difference in responsiveness. Expand
Laterality of aggressive responses in Anolis
The results suggest that the lizard Anolis, like humans, rats, and chicks, may mediate aggressive responses predominantly through right-hemispheric brain mechanisms. Expand
Estradiol facilitates mounting behavior in male green anole lizards
The present data are consistent with the idea that it facilitates a component of reproduction in the green anole, as in species from other taxa. Expand
Effects of season, testosterone and female exposure on c-fos expression in the preoptic area and amygdala of male green anoles
It appears that in the male green anole, T may diminish c-fos expression (likely in inhibitory neurons) in the POA and AMY to create a permissive environment in which the appropriate behavioral response can be displayed. Expand


Role of the amygdala in the intraspecies aggressive behavior of the iguanid lizard, Sceloporus occidentalis
  • R. Tarr
  • Medicine, Psychology
  • Physiology & Behavior
  • 1977
Abstract Enclosed populations of fence lizards demonstrate a stereotyped and stable social structure. Animals can be categorized by aggressive type allowing for a comparison of normal and alteredExpand
The role of the basal hypothalamus in the regulation of reproductive behavior in the lizard, Anolis carolinensis: Lesion studies
The basal hypothalamus in male A. carolinensis is involved both in the regulation of reproductive behavior and pituitary function and the accompanying periventricular system. Expand
Role of the paleostriatum in species-typical display behavior of the lizard (Anolis carolinensis)
In lizards with lesions involving the paleostriatum and lateral forebrain bundle, there was an elimination of or marked deficit in the performance of the challenge display while signature displays and measures of general activity were not significantly affected. Expand
A Neuroethological Study of Display Behavior in the Lizard Anolis Carolinensis (Reptilia, Lacertilia, Iguanidae)
An analysis of the effects of forebrain lesions on two stereotyped displays indicated involvement of the striatal area of the basal forebrain in species-typical “challenge” displays that are characteristic of territorial encounters between adult conspecifics. Expand
The behavioral effects of stimulating and ablating the reptilian amygdala (Caiman sklerops).
Attack and retreat motor patterns remained intact, but responses occurred less frequently, required more intense stimuli, and were without the vocalization, pupillary dilation, and hyperventilation that make up the affective display of the normal response. Expand
Castration and androgen replacement on male facilitation of ovarian activity in the lizard, Anolis carolinensis.
  • D. Crews
  • Biology, Medicine
  • Journal of comparative and physiological psychology
  • 1974
Castration abolishes male courtship behavior in the lizard, Anolis carolinensis, and consequently prevents male courtship facilitation of environmentally induced ovarian recrudescence in winterExpand
Sexual receptivity in female rats after lesion or stimulation in different amygdaloid nuclei
It is proposed that amygdaloid structures play a modulatory and integrative role on the control of sexual behavior in the female rat: activation of cells in the anterior part of the corticomedial nucleus increases the probability of lordotic responses while excitation of the neurons in the posterior part ofThe lateral nucleus has the opposite effect. Expand
3H‐Estradiol, 3H‐Testosterone and 3H‐Dihydrotestosterone localization in the brain of the lizard Anolis carolinensis: An autoradiographic study
The presence and the neuroanatomical topography of sex hormone concentrating cells in the brain of the American chameleon, Anolis carolinensis have been demonstrated and the pattern of hormone‐concentrating cells was the same in male and female brains, for each of the hormones. Expand
A forebrain atlas and stereotaxic technique for the lizard, Anolis carolinensis
A forebrain atlas and stereotaxic neurosurgical techniques were developed for use in anatomical and behavioral experiments on the green anolis lizard (Anolis carolinensis). Green anoles areExpand
Regulation of the Annual Testis Cycle by Photoperiod and Temperature in the Lizard Anolis Carolinensis
Analysis of the photo—thermal relations of testis activity in A. carolinensis in light of phenological and experimental data for testis cycles in other species indicates that considerable interspecific variation exists in saurian physiological adaptations. Expand