Extra intensity was found slightly above the energy of the phonon dispersion curve in the Q-range of 0.3-0.8 A ΛΓ1 of the scattering law S(Q, o) of bulk superfluid helium in experiments performed on IN6 (ILL, France) and DIN-2PI (IBR-2, Russia) by inelastic neutron scattering. The aim of the present experiment is to study the temperature dependence of this extra intensity in order to elucidate the origin of this feature. The measurement of S(Q, o) was performed on IN6 at 12 temperatures between 1 and 2.2 K at an incoming wavelength of 5.12 A Λin the Q-range of 0.2-2.1 A ΛΓ1 . The measurement at T ΒΌ 1.5 K was used for the extraction of the multiphonon part. The multiphonon part at 1.5 K and the one-phonon part, fitted by the DHO-function as a function of temperature, have been subtracted from the experimental S(Q, o) at T41.5 K and the remaining ''extra intensity'' temperature behavior has been analyzed. The analysis shows that the intensity of the ''extra peak'' increases with the temperature and exhibits interesting behavior when crossing the lambdatransition. In the frame of the Glyde-Griffin-Svensson model [H.R. Glyde, A. Griffin, Phys. Rev. Lett. 65 (1990)1454] four physically distinct contributions have been enumerated, which can be discussed in view of the temperature dependence of the ''extra peak''.