Neurophysiological relationship between anxiety and social rank

• Autorzy: Krotewicz M. , Wieczorek M. , Koprowska M. , Strzelczuk M.
• Języki publikacji: EN

Abstrakty

EN

Social rank means that the individuals take various positions in a social group. The individuals high in the social rank have more social opportunities compared to those low in the hierarchy. Social rank may have important consequences for the hypothalamo-pituitary-adrenocortical (HPA) system activity. It is known that the noradrenergic brain neuronal activity is closely related to the control of the HPA system. In our previous studies we observed that the brain NA system is implicated in the control of social position. The obtained data showed that the low social status was correlated with enhance of noradrenaline release. These results suggested to us that the low ranking individuals were in an anxiety state induced by the presence of a high ranking animal, winner of competitive situation. The present study was designed to examine correlations between anxiety indices measured in the popular anxiety models and positions in the social rank. Rats were exposed to open field (OF), transitions (TT) and social competition (SCT) tests. In the SCT rats were paired accordingly to their body weight and time of sugar pellets eating. The comparison of behavioural indices revealed negative correlation between number of consumed pellets and frequency of locomotion registered in OF. Additionally, the analysis of behavioural indices showed positive correlation between number of consumed pellets and behavioural indices measured in TT. Obtained data revealed that braver individuals which willingly explored new arena were successful in the SCT while the animals attribute with anxiety were losers in the social competitive situation. It suggests that anxiety is rather a reason of low ranking position of individuals then an effect of social competition. The animals got better position for competition and receive higher social rank in pairs when previously had presented better exploratory activity in the “stress”-inducing situation.

• Wydawca: -
• Czasopismo: Acta Neurobiologiae Experimentalis
• Rocznik: 2011
• Tom: 71
• Numer: S
• Opis fizyczny: p.56

Twórcy

autor

Krotewicz M.

• Department of Neurophysiolgy, University of Lodz, Lodz, Poland

autor

Wieczorek M.

• Department of Neurophysiolgy, University of Lodz, Lodz, Poland

autor

Koprowska M.

• Department of Neurophysiolgy, University of Lodz, Lodz, Poland

autor

Strzelczuk M.

• Department of Neurophysiolgy, University of Lodz, Lodz, Poland

Uwagi

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