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Titolo:
Basal midbrain modulation of tonic immobility in the toad Bufo paracnemis
Autore:
Gargaglioni, LH; Pereira, ASF; Hoffmann, A;
Indirizzi:
Univ Sao Paulo, Fac Med Ribeirao Preto, Dept Physiol, BR-14049900 RibeiraoPreto, SP, Brazil Univ Sao Paulo Ribeirao Preto SP Brazil BR-14049900 BCaoPreto, SP, Brazil
Titolo Testata:
PHYSIOLOGY & BEHAVIOR
fascicolo: 3, volume: 72, anno: 2001,
pagine: 297 - 303
SICI:
0031-9384(200102)72:3<297:BMMOTI>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
HABENULO-INTERPEDUNCULAR SYSTEM; NUCLEUS; LESIONS; PROJECTIONS; TEGMENTUM; BEHAVIOR; FROG; RATS;
Keywords:
midbrain tegmentum; interpeduncular nucleus; electrolytic and neurotoxic lesions; tonic immobility; defensive behavior; thermal nociception; toad (Bufo paracnemis);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Life Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Hoffmann, A Univ Sao Paulo, Fac Med Ribeirao Preto, Dept Physiol, BR-14049900 RibeiraoPreto, SP, Brazil Univ Sao Paulo Ribeirao Preto SP Brazil BR-14049900 BC Brazil
Citazione:
L.H. Gargaglioni et al., "Basal midbrain modulation of tonic immobility in the toad Bufo paracnemis", PHYSL BEHAV, 72(3), 2001, pp. 297-303

Abstract

Tonic immobility (TI) is considered to be a final stage in a sequence of defensive responses occurring in the prey/predator encounter. It is known that the basal midbrain of toads is involved in the organization of defensivebehavior and analgesia. This study investigated the effect of electrolyticor neurotoxic lesions of two mesencephalic regions [tegmentum (TEG) and interpeduncular nucleus (IPN)] on the latency and duration of TI (induced by postural inversion and by movement restriction) and on the latency of the motor response to a nociceptive stimulus (hot plate) in toads. Electrolytic lesions of TEG and IPN promoted an increase in the duration of TI episodes. Neurotoxic lesion of these two regions also caused an increase in the duration of TI episodes. The effect was more intense in the animals with electrolytic lesion, possibly due to more extensive damage associated with this procedure or to damage of passage fibers. The results suggest that lesions of the midbrain TEG liberate basic circuits placed caudally and are involvedin the organization of the TI response. It remains to be determined if theIPN exerts its effect directly on the caudal levels or by acting via the mesencephalic TEG. Lesions do not interfere with the latency of the motor response to a thermal noxious stimulus, indicating that the lesioned regions do not affect the reflexive response and are not essential for the perception of the noxious stimulus. (C) 2001 Elsevier Science Inc. All rights reserved.

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Documento generato il 03/04/20 alle ore 04:07:55