  Quantum memory effects can be related to a bidirectional exchange of
information between an open system and its environment, which in turn modifies
the state and dynamical behavior of the last one. Nevertheless,
non-Markovianity can also be induced by environments whose dynamics is not
affected during the system evolution, implying the absence of any physical
information exchange. An unsolved open problem in the formulation of quantum
memory measures is the apparent impossibility of discerning between both
paradigmatic cases. Here, we present an operational scheme that, based on the
outcomes of successive measurements processes performed over the system of
interest, allows to distinguishing between both kinds of memory effects. The
method accurately detects bidirectional information flows in diverse
dissipative and dephasing non-Markovian open system dynamics.
