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Fig. 1. Movements of the left front leg during phonotaxis. (A) Animals responded to
alternating six-chirp sequences from the left and right with steering towards
the active speaker. During steering to the contralateral (right) speaker the
left front leg performed large left–right movements towards the
stimulated side, but during steering to the ipsilateral (left) speaker only
small left–right movements occurred. The pattern of up–down leg
movements was constant. (B) Rapid change in leg movement; section from A as
indicated. The red trace is an exact copy of the first step shown, indicating
the leg movement without a turn. Within two syllables of ipsilateral sound
presentation (60 ms) the movement deviates from the predicted trace. (C)
Up–down and left–right recordings of left front leg movements
during steering were combined into 2D projections. The background photograph
was taken independently for illustrative purposes. During steering to the
contralateral (right) speaker the anterior extreme point (AEP, asterisk) of
the left front leg was shifted in front of the head during the swing phase.
This allowed animals to pull towards the active speaker during the following
stance phase. By contrast, during steering to the ipsilateral (left) speaker
the AEP was directly in front of the leg resting position.
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