. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Cross-Correlation of Above Signals -Peak r=.91 p=<.001 Half-Heighl (). 0 Delay (s) Figure 1. A representative cross-correlation (n = 1411) from our data set. Only the first second and hull / rlic range of the cross- correlation is slum-it. All nl the cross-correlations showed a zero delay and a high degree of s\mmetr\ anninil that delay. The method of determining the half-width of the cross-correlation is illustrated in the diagram. We measured half width by finding the two points of intersection between
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Cross-Correlation of Above Signals -Peak r=.91 p=<.001 Half-Heighl (). 0 Delay (s) Figure 1. A representative cross-correlation (n = 1411) from our data set. Only the first second and hull / rlic range of the cross- correlation is slum-it. All nl the cross-correlations showed a zero delay and a high degree of s\mmetr\ anninil that delay. The method of determining the half-width of the cross-correlation is illustrated in the diagram. We measured half width by finding the two points of intersection between the horizontal line at the _W7r maximum correlation level and the correlogram. The half-width was the distance between these nru points projected onto the time axis. Peak asymmetry was measured by comparing the integrated areas beneath the correlograin between these nro half-widths anil the delav of the peak correlation. We thank Dr. Deborah Compton of the Boston University Aeronautical Engineering department for fluid dynamics advice, and the loan of the laser and optical equipment. We thank Doug Bowman and Neil Glickman from Universal Imaging, and Meg Steele and Carla Guenther for valuable technical assistance. This work was supported by NSF-REU (OCE-960599) Site Grant to Boston University and DARPA-ONR Award (N00014-98-1-0822) to FG and JA. Literature Cited I Devine, D., and J. Atema. 1982. Biol. Bull. 163: 144-153. 2. Beglane, P., F. VV. Grasso, J. Basil, and J. Atema. 1997. Biol. Bull. 193: 214-215. 3. Grasso, F. J. H. Dale, T. R. Consi, D. C. Mountain, and J. Atema. 1996. Biol. Bull. 191: 312-313. 4 Grasso, F. VV., J. H. Dale, T. R. Consi, D. C. Mountain, and J. Atema. 1997. Biol. Hull. 193: 2l5-21h. 5. Dittmer, K., F. W. Grasso, and .1. Atema. 1996. Biol. Bull. 191: 313-314. 6. Dittmer, K., F. W. Grasso, and J. Atema. 1995. Biol. Bull. 189: Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabi
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