From observations at the Effelsberg 100-m telescope, we intend to derive statistical properties of stochastic gas motion inside the dense molecular cores traced by NH₃(1,1) and (2,2) emission lines. For the first time we found oscillating autocorrelation functions (ACFs) of the gas motion which eventually decay to zero with increasing lags on the scale 0.04 pc < l < 0.5 pc. The current paradigm supposes that the star formation process is controlled by the interplay between gravitation and turbulence, the latter preventing molecular cores from a quick collapse due to their own gravity. Thus, oscillating ACFs may indicate a damping of the developed turbulent flows surrounding the dense but less turbulent core - a transition to dominating gravitational forces and, hence, to gravitational collapse.

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