Interactions of movement and EODs for producing envelopes.

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Presentation transcript:

Interactions of movement and EODs for producing envelopes. Interactions of movement and EODs for producing envelopes. In naturalistic conditions, weakly electric fish are often in groups of three or more individuals and are moving relative to one another, producing a complex envelope that contains a social and movement-generated component. (A) There are three fish, with one fish that is stationary and two fish (purple and blue) that are swimming (inset). The distance from fish 1 to each of the swimming fish (magenta and orange) varies as a function of the relative movement. The combined signal (black) contains the EODs of all three fish, an AM (green) and a complex envelope (red), which is composed of both the movement and the difference between the AM frequencies (ddF), from the social EOD interactions. (B) A Fourier analysis shows the power for each of the signals – the combined signal (black), the AM (green) and the envelope (red; consisting of movement and social components). (C) A close-up of B, highlighting the power below 5 Hz, which is due to the relative movement of the three fish, and at 5 Hz, which is due to the social envelope, and results from our choice of EOD frequencies (300, 350, 395 Hz) in this simulation. We have also replotted the power spectrum from the non-moving three fish case (red dotted line; from Fig. 2C) to highlight the potential separation between social and movement-generated envelopes. Sarah A. Stamper et al. J Exp Biol 2013;216:2393-2402 © 2013. Published by The Company of Biologists Ltd