Figure 2. Phonotactic behaviour.

(A): Directional acoustic stimulation between 0° and ±6° azimuth and cricket steering responses. At each speaker position calling song was presented for 30 s at 75 dB SPL. Steering response (lateral deviation) increased with increasing speaker azimuth. (B): Lateral deviation and forward walking response for different speaker positions. Lateral deviation increased with increasing stimulation angles. (A, B): Clear steering towards the stimulation side occurred already at ±1° azimuth; t-Test: *p<0.05; ***p<0.005. (C): Combining lateral deviation (x-axis) and forward movement (y-axis) revealed individual walking paths of a cricket over 30 s. At small stimulus angles the cricket slightly oversteered and for larger angles they steered less in comparison to ideal path lines. Note the different scaling for forward and lateral walking component. (D): Relation between stimulation angle and the walking vector angle. Relative to the ideal performance line the animals slightly oversteered for speaker positions smaller than 6° and they increasingly understeered for positions larger than 6°. The trendline corresponds to a logarithmic function. (B, D): Data pooled from 15 animals.