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Fig. 12. Block diagram of a typical flight control system of airplanes. The inside
loop including K1 is called a `stabilization control
loop'. This K1 loop controls quick responses reflexively.
The outside loop including K2 is called a `guidance and
navigation control loop'. The K2 loop controls relatively
slow responses such as selection of a flight course. This
K2 loop is likely comparable to the system that conveys an
intention in the bees. The reflexive responses measured in our study are most
likely corresponding to the output of the K1 loop,
Y1.