Resumen El articulo presenta resultados de un estudio cuyo objetivo fue establecer la existencia de un patron de pensamiento silogistico y de creencias irracionales prototipicos de la depresion en un grupo de casos comparado contra otro de controles en 34 participantes masculinos adultos diagnosticados con depresion y su contraparte con ausencia del trastorno. La hipotesis afin con este objetivo se verifico mediante un estudio ex post facto retrospectivo de casos y controles, con resultados de X 2 =6,65852 (Con p≤0.50 y gl=7), respecto al esperado X 2 = 6.346, y de X 2 =6,03118 (Con p≤0.70 y gl=7), respecto al esperado X 2 = 4,671. Se concluye que existe un patron de pensamiento irracional con estructura prototipica. Palabras clave: Depresion, creencias irracionales, patron de pensamiento, REBT. Abstract The objective of this survey was establishing the existence of a prototypical depressive syllogistic reasoning pattern and beliefs into a group of cases diagnosed with depression compared against another one without this diagnosis (controls group) in 34 adults male participants. The hypothesis according with this objective was verified by mean of a retrospective ex post facto study of cases and controls with results like X 2 =6,65852 ( p≤0.50 and gl=7), on regard to that expected X 2 = 6.346, and of X 2 =6,03118 ( p≤0.70 and gl=7), on regard to that expected X 2 = 4,671. It is concluded that there is an irrational depressive reasoning with a prototypical structure. Key words: Depression, irrational beliefs, reasoning pattern, REBT.