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Results for “AMYGDALOID BODY”

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PubMedDate not supplied

[Sexual and interhemispheric differences in the involvement of serotonin from the hippocampus and amygdaloid body in the processing of new and repeatedly presented information in rats].

Effects of novel or relevant (a single exposure to experimental chamber) and irrelevant (20 exposures to experimental chamber) stimuli on the levels of serotonin (5-HT) and its metabolite 5-hydroxyindoleacetic acid (5-HIAA) in the left and right hippocamp and amygdala were studied in male and female rats. It was found that hemispheric specificity of 5-HT metabolism in hippocampus and amygdala depended on sex and novelty of information. In male rats, the hippocampal level of 5-HT in response to the novel stimulus increased in the left hemisphere, and the 5-HIAA hippocampal level increased bilaterally in response to irrelevant stimulus. In females, an increase in 5-HT and/or 5-HIAA levels was observed only in the left hippocampus in response both to relevant and irrelevant stimuli. In the amygdala, a hemispheric asymmetry of the 5-HT involvement, due to right-hemispheric changes in 5-HT metabolism, was observed only in male rats. In females, an increase in 5-HT level was found in the left and right amygdalas in response to irrelevant stimulus. These data suggest that serotonergic neurotransmitter mechanisms are an important factor which determines hemispheric and sex differences in selective attention.

Amygdala↗
PubMedDate not supplied

[The behavioral changes and the EEG of the rat brain induced by hyperactivation of the amygdaloid body under noradrenergic deficiency].

The brain NA deficit was produced by bilateral injection of 6-OHDA into the locus coeruleus. Three weeks later amygdala hyperactivation was initiated by local penicillin injection (1% solution, 0.5 mcl). Saline in the same volume was used in control groups in both cases. It was shown that the decrease in NA level facilitated the development of epileptiform activity in rat brain and appearance of immobility-related high-voltage spindles during waking. The amygdala hyperactivation after NA deprivation resulted in a decrease in exploratory activity and disruption of the reaction to novelty. The delta component of the EEG power spectrum increased. The alterations appeared 1-2 weeks after the experimental procedure and became more pronounced towards the end of the third week.

Amygdala↗
PubMedDate not supplied

[The acquisition of a cyclic maze habit in rats (as a model of cognitive activity) with removal of the amygdaloid body].

Learning cyclic habit in a multialternative maze (with a possibility of many rewarded choices) was shown to be possible for amygdalectomized rats. All three normal types of the "learning curves" (a number of cycles as a function of the number of sessions) were observed in rats after surgery, i.e., exponent, logistic function, and "no-trend" function. This is in agreement with Simonov's concept. However, the general style of behavior was changed. The behavior became "excessive": there was an increase in the number of errors and in the locomotion rate, which suggests a disbalance of emotional-cognitive interrelations. The extent of deviation from norm is different for each type. The findings suggest the different functional weight of amygdala in the normal activity.

Amygdala↗
PubMed2003

[Neuronal organisation of the central part of the brain amygdaloid body].

Characteristics of neurons in amygdala central division were investigated and compared with the data available in literature on the similar parameters of the cells in its anterior and posterior divisions. Silver nitrate impregnation of neurons using Golgi method was used in this work. Classification and measurements of neurons were performed using Leontovich method (1978). Peculiarities of representation and quantitative characteristics of long-axonal and short-axonal neurons in amygdala central division were shown.

Amygdala↗
PubMedDate not supplied

[Effect of successive lesions of the hippocampus and amygdaloid body on conditioned-reflex alimentary reactions in rabbits].

Bilateral electrolytic lesions of the dorsal hippocamp and basolateral amygdalar complex impede the differential and extinctive inhibition. The damage of the corticomedial amygdala against a background of the dorsal hippocamp deficiency facilitates differentiation and extinction of alimentary reflexes induced by a decrease of the alimentary motivation and by weakening of alimentary conditioned reflexes. Lesions of the dorsal hippocamp after the corticomedial amygdala damage facilitates the training of positive alimentary reflexes, but weakens inhibitory conditioned reflexes.

Amygdala↗