An isolated fraction of the putty gum, the fraction comprising the polymeric myrcene and being obtainable by: a) contacting the putty gum with at least one polar organic solvent； b) isolate a fraction that is soluble in the at least one polar organic solvent； c) treating the soluble fraction obtained in step b) with at least one non-polar organic solvent selected from a C5-C10-alkane, d) isolating a fraction that is soluble in said non-polar organic solvent, in which the steps to ) ab) and c) ad) are each carried out independently of a number of cycles, in which the fraction is substantially devoid of compounds that are soluble in said polar organic solvent but insoluble in said non-polar organic solvent, in which At least one polar organic solvent is an alcohol selected from the group consisting of methanol, ethanol, propanol, isopropanol, 1-butanol, 2-butanol, sec-butanol, t-butanol, 1-pentanol, 2-pentanol, 3-pentanol , neopentanol, 3-methyl-1-butanol, 2-methyl-1-butanol, 3-methyl-2-butanol, 2-methyl-2-butanol, ethylene glycol, and ethylene glycol monomethyl ether, and mixtures thereof, for use in the treatment of an altered neurological function, in which neurological function altered comprises a decrease in a function selected from the group consisting of cognitive function, sensory function, motor function and combinations thereof.Una fracción aislada de la goma de masilla, comprendiendo la fracción el mirceno polimérico y siendo obtenible por: a) poner en contacto la goma de masilla con al menos un disolvente orgánico polar； b) aislar una fracción que es soluble en el al menos un disolvente orgánico polar； c) tratar la fracción soluble obtenida en la etapa b) con al menos un disolvente orgánico no polar seleccionado de un C5-C10-alcano, d) aislar una fracción que es soluble en dicho disolvente orgánico no polar, en el que los pasos a) a b) y c) a d) se llevan a cabo cada uno independientemente de un número de ciclos, en el que la fracción está sustancialmente
