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Fig. 2 | BMC Biology

Fig. 2

From: Echolocating bats can adjust sensory acquisition based on internal cues

Fig. 2

Doppler compensation without feedback in R. ferrumequinum. a An example of one trial showing the emission frequency with feedback (blue), the emission frequency without feedback (red), and the emission frequency of a Stationary trial (green). These colors are the same for all panels. The gray dashed curve shows the pendulum’s speed where positive speed means forward movement. A vertical arrow shows the point of maximum velocity when Doppler compensation should be maximal. A double-headed horizontal arrow shows one period of the movement and response. The response between 3.5 and 5 s without feedback (red) is absent because the bat did not call. All values in bd are normalized between 0 and 1 to allow a comparison of the different units. Note that ferrumequinum frequencies in Israel are slightly higher than in Bulgaria. b The distribution of the period for the three conditions: Feedback, No Feedback, and Stationary. c The distribution of cross-correlation peak between the movement and the Doppler response for the three conditions. The cross-correlation was bound between 0 and 1 in our case with a perfect correlation represented by a value of 1. d The magnitude of compensation presented as a proportion of full compensation

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