Alma Gabriela Martínez

Efectos del consumo de café sobre la conducta alimentaria en ratas

Resumen El objetivo del presente estudio fue evaluar los efec-tos del consumo de cafe con y sin cafeina sobre la conducta alimentaria en ratas. Dieciseis ratas fueron expuestas a 2, 3, 4 y 5 gramos de cafe con cafeina y sin cafeina diluidas en 200 ml de agua. Los sujetos fueron asignados a cuatro grupos conformados por dos hembras y dos machos cada uno. Los grupos 1 y 2 fueron expuestos a cafe con cafeina y los grupos 3 y 4 a cafe sin cafeina. La exposicion de cafe para los gru-pos 1 y 3 fue de forma ascendente (2 g, 3 g, 4 g y 5 g) y para los grupos 2 y 4 de forma descendente (5 g, 4 g, 3 g y 2 g). El experimento fue dividido en nueve fa-ses. Las fases 1, 3, 5, 7 y 9 tuvieron una duracion de diez dias, en cada una se proporcionaron 200 ml de agua y 50 g de alimento. Las fases 2, 4, 6 y 8 tuvieron una duracion de cinco dias cada una, en las cuales se les proporciono las concentraciones de cafe y 50 g de alimento. Los resultados mostraron que las concen-traciones bajas de cafe registraron un mayor consu-mo en comparacion con las concentraciones altas en ambas condiciones (ascendente y descendente). Por otra parte, el cafe sin cafeina fue mas consumido que el cafe con cafeina.

Observación y experimentación en psicología: una revisión histórica

A brief history about theoretical and experimental contributions is described of researches to the development of the experimental psychology. In the Alma Gabriela Martinez Antonio Lopez-Espinoza *

Sex and social interaction on novel food consumption.

Several elements provide information for food consumption, among them: taste, flavor and texture. These components, own experience, social interaction and innate aspects influence in the novel food consumption. Experimental evidence suggests that social interaction is an important factor for food consumption. This study evaluated effects of sex and social interaction on novel food consumption. Twenty-one human subjects, both sexes, between 20- and 28-years-old, which were not known between them, were exposed to different familiar foods and novel foods. Subjects were divided in two groups. First group was formed by man, second by woman; and third group by subjects of both sexes. Data suggest that (1) men did not talk about foods and only a few men proved some novel food; (2) women talked about foods and they had more knowledge about them, but only a few women proved novel food; (3) when men and women were in the same group, only men consumed novel food and they encouraged to women to prove novel foods. These results suggest that sex and social interaction modifies feeding behavior and affects novel food consumption.