Role of the paleostriatum in species-typical display behavior of the lizard (Anolis carolinensis)

Greenberg, Neil; MacLean, Paul D.; Ferguson, John L.

doi:10.1016/0006-8993(79)90535-3

Cited by 74 publications

(23 citation statements)

References 14 publications

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“…We found that testosterone level was significantly correlated with the sizes of both the NS (r s =0. 56 44) or AMY (r s =−0.018, n=23, p=0.94), and withingroup analyses were all nonsignificant (p>0.05 for all). Within the sham treatment group, some animals likely experienced seasonal declines in hormone levels more recently than others, thus creating the observed variation in brain measurements.…”

Section: Hormone Treatment and Brain Morphometricsmentioning

confidence: 99%

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Steroid hormones alter neuroanatomy and aggression independently in the tree lizard

Kabelik

Weiss

Moore

2008

Physiology & Behavior

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KABELIK, D., Weiss S. L. AND MOORE M. C. Steroid hormones alter neuroanatomy and aggression independently in the tree lizard. PHYSIOL BEHAV 00(0) 000-000, 0000. -Steroid hormones affect changes in both neuroanatomy and aggressive behavior in animals of various taxa. However, whether changes in neuroanatomy directly underlie changes in aggression is unknown. We investigate this relationship among steroid hormones, neuroanatomy, and aggression in a free-living vertebrate with a relatively simple nervous system, the tree lizard (Urosaurus ornatus). Weiss and Moore [1] manipulated testosterone and progesterone levels in adult male tree lizards and found that both hormones facilitated aggressive behavior toward a conspecific. In this study, we examined the brains of a subset of these animals to determine whether changes in limbic morphology were associated with hormone-induced changes in aggressive behavior. Specifically, we tested the hypothesis that testosterone and/or progesterone cause changes in neural morphology that are necessary for the expression of testosterone's effects on aggressive behavior. We found that both hormones increased aggression; however, only testosterone induced changes in neuroanatomy. Testosterone increased the size of both the amygdala and nucleus sphericus. However, we could detect no individual correlations between neuroanatomy and aggression levels suggesting that the observed large-scale changes in neuroanatomy are not precisely reflective of changes in mechanisms underlying aggression.

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Section: Hormone Treatment and Brain Morphometricsmentioning

confidence: 99%

“…This region is also known as the posterior dorsal ventricular ridge [56]. We measured the AMY across the same three brain sections as the NS.…”

Section: Nucleus Sphericus (Ns)-mentioning

confidence: 99%

Steroid hormones alter neuroanatomy and aggression independently in the tree lizard

Kabelik

Weiss

Moore

2008

Physiology & Behavior

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“…Anolis carolinensis has no homologue to the corpus callosum, instead possessing only a small anterior commissure and a small interhemispheric hippocampal commissure that interconnects regions of the dorsal cortex [Armstrong et al, 1953]. Behavioral work done by Greenberg et al [1979] suggests that these interhemispheric systems do not functionally integrate the cerebral hemispheres of Anolis. These authors found that lesions of the amygdala, followed by contralateral eye patching, impair the response of Anolis to social stimulation.…”

Section: Hemispheric Control Of Territorial Aggression In Anolis Caromentioning

confidence: 99%

“…Anolis carolinensis have a well defined series of increasingly aggressive, stereotypical responses [Greenberg and Noble, 1944;Greenberg, 1977;Jenssen, 1977;Carpenter, 1978;Greenberg et al, 1979;Deckel, 1995]. These behaviors were observed and recorded by an experienced observer during the course of the 3-minute trials, and included six actions in order of increasing aggressivity: (1) head bobbing (a series of rapid head bobs unaccompanied by other behaviors; (2) dewlapping-only (a colorful expansion of the throat fan unaccompanied by any other behaviors); (3) head bobbing plus dewlapping (i.e., rapid head bobs accompanied by expansion of the colorful throat fan); (4) aggressive locomotion towards the other subjects; (5) threatened bites (i.e., opening of the mouth of the aggressing animal in a posture implying a threatened bite); and (6) actual bites.…”

Section: Behavioral Measuresmentioning

confidence: 99%

Hemispheric Control of Territorial Aggression in <i>Anolis carolinensis:</i> Effects of Mild Stress

Deckel

1997

Brain Behav Evol

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Previous work has demonstrated that the brain of Anolis carolinensis is functionally split, in that the left and right eyes project predominantly to the contralateral hemisphere, and as there are minimal connections between the left and right hemispheres. Using this model, the current experiment examined the effect of mild acute stress on hemispheric regulation of territorial aggression. Thirteen adult male Anolis were paired with an antagonistic males, and eye use and behavioral responses were repeatedly measured during 3 minute behavioral trials. Trials were conducted either after exposure to mild stress, produced by handling the subject, or without stress, and they were run either in the subject’s home cage or in a cage foreign to the subject. Left eye preference for aggressive movements was found during the trials run in the non-stressed conditions (p <0.05). Conversely, stressed subjects showed a reduction in left eye/right hemisphere mediated aggressive movements relative to the non-stressed subjects but no changes in right eye/left hemisphere aggression. This effect was independent of whether or not the subject was in its home or a foreign cage. No laterality in aggressive responding was found when the subjects were placed in separate cages with visual contact. These findings suggest that territorial aggression in Anolis is preferentially initiated and processed by the left eye/right hemisphere but is subject to right-hemispheric inhibition following exposure to acute mild stress.

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“…Greenberq and Noble, 1944Greenberg, 1977aGreenberg, et al, 1979McCardell, 1971Sigmund, 1979, 19R3 Echelle, et al, 1971a, 1971bJenssen and Gladson, 1984 Garcea and Gorman, 196R Gorman, 1968 Garcea and Gorman, 196R Ortiz and Jenssen, 1982 Echelle, 1975Ruibal, 1967 Ortiz and Jenssen, 19R2 Echelle, 1975 Echelle, et al, 1971a Jenssen, 19R3 Jenssen, 19R3 Echelle, 1975Fitch and Henderson, 1976 Gorman, 196P Gorman and Stamm, 1975Fitch and Henderson, 1976Jenssen, 1977aJenssen, 1977b, 19R1 Gorman, 196P Gorman and Stamm, 1975 …”

mentioning

confidence: 99%

An inventory of the display-action-patterns in lizards

Carpenter¹

1986

Smithsonian Herpetological Information Service

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Role of the paleostriatum in species-typical display behavior of the lizard (Anolis carolinensis)

Cited by 74 publications

References 14 publications

Steroid hormones alter neuroanatomy and aggression independently in the tree lizard

Steroid hormones alter neuroanatomy and aggression independently in the tree lizard

Hemispheric Control of Territorial Aggression in <i>Anolis carolinensis:</i> Effects of Mild Stress

An inventory of the display-action-patterns in lizards

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