A.P.C. Pereira

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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 defensive behavior and analgesia. This study investigated the effect of electrolytic or neurotoxic lesions of two mesencephalic regions(More)
We used biotinylated dextran amine (BDA) to anterogradely label individual axons projecting from primary somatosensory cortex (S1) to four different cortical areas in rats. A major goal was to determine whether axon terminals in these target areas shared morphometric similarities based on the shape of individual terminal arbors and the density of two bouton(More)
The visualization of tools and manipulable objects activates motor-related areas in the cortex, facilitating possible actions toward them. This pattern of activity may underlie the phenomenon of object affordance. Some cortical motor neurons are also covertly activated during the recognition of body parts such as hands. One hypothesis is that different(More)
Transcutaneous electrical nerve stimulation (TENS) is a type of therapy used primarily for analgesia, but also presents changes in the cardiovascular system responses; its effects are dependent upon application parameters. Alterations to the cardiovascular system suggest that TENS may modify venous vascular response. The objective of this study was to(More)
Findings by our group have shown that the dorsolateral telencephalon of Gymnotus carapo sends efferents to the mesencephalic torus semicircularis dorsalis (TSd) and that presumably this connection is involved in the changes in electric organ discharge (EOD) and in skeletomotor responses observed following microinjections of GABA A antagonist bicuculline(More)
Cholinergic stimulation of the mesencephalic reticular formation with carbachol impairs the induction of tonic immobility (TI) by restraining maneuvers and reduces the duration of immobility episodes in guinea pigs. This finding apparently disagrees with the hypothesis that environmental monitoring occurs during TI which permits the animal to evaluate the(More)
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