Effects of deprivation history on operant performance, on weight and on water and food consumption / Efeitos da história de privação no desempenho operante, no peso e no consumo de água e alimento

AUTOR(ES)

Julia Guedes da Rocha

DATA DE PUBLICAÇÃO

2008

RESUMO

This thesiss intent was to verify the effects of deprivation history on operant performance, on weight and on water and food consumption in rats. Another purpose was evaluate the effects of the experimental sessions on weight and on water and food consumption, with subjects under different deprivation history. Twelve rats were divided in 4 groups of three rats and each group was submitted to different deprivation history. All subjects were submitted to a preparing phase, which consisted of a 1st condition, when they had free access to the food, and a 2nd condition, in which the subjects were food deprived. After the preparing phase, the history phase began. Then, each group was submitted to different alternations between free access and food deprivation. When they were deprived, the subjects had one hour of food access daily. Two of the three subjects of each group had been on VI60 s sessions since the 2nd condition of the preparing phase. The results suggest: (1) the subjects gained more weight in the beginning of the 1st return to free access condition than the 2nd return to that condition; on each exposure to deprivation, the lost of weight took less time than the previous exposure; (2) the operant box sessions seemed to be an important variable on weight maintenance and recovery of some subjects; (3) the water consumption often decreased during deprivation; (4) the caloric ingestion decreased during deprivation and increased when subjects returned to free access conditions, to values beyond that registered in the 1st condition. After that, there is a decrease in caloric ingestion, bigger on each return to free access condition; (5) the previous condition, free access or deprivation, seems to produce effects on the first experimental sessions of each new condition

ASSUNTO(S)

história de privação deprivation history psicologia experimental body weight privacao (psicologia) comportamento operante peso corporal psicologia -- experimentos water consumption food consumption consumo de água consumo de alimento

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