title: The "anxiety state" and its relation with rat models of memory and habituation.
abstract: Rats selected as "anxious", "nonanxious," or normal according to their behavior in an elevated plus maze were submitted to memory tasks and the densities of central benzodiazepine receptors in the amygdala and the hippocampus were studied. Anxious rats exibited better retention scores in the inhibitory avoidance task while nonanxious rats exibited worse retention scores in inhibitory and two-way active avoidance tasks compared to normal rats. No significant differences were detected in the retention scores for habituation to an open field. Nonanxious rats presented a lower benzodiazepine receptor density in the hippocampus but not in the amygdala compared to the other groups. These data suggest that the benzodiazepine receptors are involved in the effect of "anxiety" or emotional states on memory storage processes.
authors.affiliation: Dep. Farmacologia, UFPR, Laboratório de Fisiologia e Farmacologia do SNC, Curitiba, PR, 81.531-990, Brazil.
authors.forename: R L
authors.initials: RL
authors.lastname: Ribeiro
authors.forename: R
authors.initials: R
authors.lastname: Andreatini
authors.forename: C
authors.initials: C
authors.lastname: Wolfman
authors.forename: H
authors.initials: H
authors.lastname: Viola
authors.forename: J H
authors.initials: JH
authors.lastname: Medina
authors.forename: C
authors.initials: C
authors.lastname: Da Cunha
mesh_terms: D000679:Amygdala / Q000502:physiology; D000818:Animals; D001007:Anxiety / Q000235:genetics*; D001143:Arousal / Q000235:genetics*; D001931:Brain Mapping; D015870:Gene Expression / Q000502:physiology; D006185:Habituation, Psychophysiologic / Q000235:genetics* / Q000502:physiology; D006624:Hippocampus / Q000502:physiology; D006801:Humans; D008297:Male; D018782:Maze Learning / Q000502:physiology; D011939:Mental Recall / Q000502:physiology*; D008957:Models, Genetic; D051381:Rats; D017208:Rats, Wistar; D011963:Receptors, GABA-A / Q000235:genetics / Q000502:physiology; D012153:Retention, Psychology / Q000502:physiology; D012641:Selection, Genetic
chemical_list: D011963:Receptors, GABA-A