Striato-amygdaloid transition area lesions reduce the duration of tonic immobility in the lizard Podarcis hispanica
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Otros documentos de la autoría: Davies, D. Ceri; Martinez-Garcia, Fernando; Lanuza, Enrique; Novejarque, Amparo
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http://dx.doi.org/10.1016/S0361-9230(01)00687-6 |
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Título
Striato-amygdaloid transition area lesions reduce the duration of tonic immobility in the lizard Podarcis hispanicaFecha de publicación
2002Editor
ElsevierISSN
0361-9230Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://www.sciencedirect.com/science/article/pii/S0361923001006876#Versión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
Neuroanatomical data suggest that the lizard striato-amygdaloid transition area is homologous with the mammalian central amygdala. In order to investigate possible functional similarities, tonic immobility was induced ... [+]
Neuroanatomical data suggest that the lizard striato-amygdaloid transition area is homologous with the mammalian central amygdala. In order to investigate possible functional similarities, tonic immobility was induced in adult lizards and its duration recorded. Each lizard was then randomly assigned to one of three treatments: (1) bilateral striato-amygdaloid transition area lesions, (2) bilateral dorsal cortex lesions or (3) untreated controls. Three days after trial 1, each lizard was subjected to a second trial and the tonic immobility duration recorded. The mean tonic immobility duration in lizards with striato-amygdaloid transition area lesions was significantly shorter (80.5%; p < 0.0033) in trial 2 than in trial 1. There were no inter-trial differences within dorsal cortex-lesioned lizards or untreated controls. There was a significant treatment effect on tonic immobility duration in trial 2 (p < 0.0001). The mean tonic immobility duration of lizards with striato-amygdaloid transition area lesions was significantly shorter than that of dorsal cortex-lesioned lizards (72.2%; p < 0.01) or untreated controls (78.2%; p < 0.01). There was no significant difference in mean tonic immobility duration between dorsal cortex-lesioned lizards and untreated controls. Tonic immobility is considered to be an anti-predator behaviour that reflects the underlying state of fear. Therefore, the reduced tonic immobility duration in lizards with striato-amygdaloid transition area lesions reflects a reduction of fear. These results provide the first data to indicate a functional similarity between the lizard striato-amygdaloid transition area and the mammalian central amygdala. [-]
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Brain Research Bulletin, v. 57, n. 3–4Derechos de acceso
Copyright © 2002 Elsevier Science
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