Viviane Mitsuko Saito

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Chemical and electrical stimulation of the inferior colliculus (IC) causes defensive behavior. Electrical stimulation of the IC at the escape threshold enhances dopamine (DA) release in the prefrontal cortex. Intra-ventral tegmental area injections of quinpirole at doses that act presynaptically reduce the release of DA in the terminal fields of the(More)
Electrical stimulation of midbrain tectum structures, particularly the dorsal periaqueductal gray (dPAG) and inferior colliculus (IC), produces defensive responses such as freezing and escape behavior. Freezing also results after termination of this stimulation (post-stimulation freezing; PSF). Whereas these responses are critically mediated by GABA in the(More)
Recent discussions on the ethics in animal experimentation instigate the refinement of methods used in Behavioral Neuroscience, particularly regarding fear/anxiety paradigms. We propose the Light Switch-Off Test (LSOT), based on the innate motivation to cease an aversive stimulus (bright light), displayed naturally by rodents in their habitat. Forty-six(More)
A reduction of dopamine release or D2 receptor blockade in the terminal fields of the mesolimbic system, particularly the amygdala, clearly reduces conditioned fear. Similar D2 receptor antagonism in the neural substrates of fear in the midbrain tectum attenuates the processing of unconditioned aversive information. However, the implications of the(More)
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