Questionnaires were administered to 618 voluntary participants, with an average age of 13.6 years, from different levels of high school, state and private school in a district in the south of Lima. It analyzed the internal structure of both short versions using three models: a) unidimensional (M1), b) oblique or related dimensions (M2), and c) the bifactor model (M3). Results show that both instruments have a single dimension which best represents the variability of the items; a fact that can be explained both by the complexity of the concept and by the small number of items representing each factor, which is more noticeable in the BSSS4. Reliability is within levels found by previous studies: alpha: .745 = BSSS8 and BSSS4 =. 643; omega coefficient: .747 in BSSS8 and .651 in BSSS4. These are considered suitable for the type of instruments studied. Based on the correlation between the two instruments, it was found that there are satisfactory levels of equivalence between the BSSS8 and BSSS4. However, it is recommended that the BSSS4 is mainly used for research and for the purpose of describing populations. ambos instrumentos tienen una sola dimensión que representa mejor la variabilidad de los ítems, hecho que puede ser explicado tanto por la complejidad del concepto como por la pequeña cantidad de ítems que representan a cada factor; aspecto que se potencia en el BSSS4; la fiabilidad cae dentro de los niveles que los estudios anteriores hallaron (Alfa: BSSS8= .745 y BSSS4= .643) y (Coeficiente Omega: .747 del BSSS8 y .651 del BSSS4) los mismos que se consideran adecuados para el tipo de instrumentos estudiados. A partir de la correlación entre ambos instrumentos, se encontró que existen niveles satisfactorios de equivalencia entre el BSSS8 y BSSS4. Se recomienda sin embargo que el BSSS4 se utilice fundamentalmente para trabajos de investigación y con propósitos de describir poblaciones.Palabras clave: búsqueda de sensaciones; adolescente; estructura interna; validación; fiabilidad; equivalencia. Escala breve de búsqueda de sensaciones (BSSS): estructura latente de las versiones de 8 y 4 ítems en adolescentes peruanos

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