Leeches require closed loop sensory feedback to localize stimuli.

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Leeches require closed loop sensory feedback to localize stimuli. Leeches require closed loop sensory feedback to localize stimuli. (A) A schematic illustrating open-loop and closed-loop control of behavior. (B) The probability of finding the stimulus location under interrupted (white, N=11) and constant (gray, N=9) conditions. *P<0.05 based on a χ2 test. (C) The probability of localizing either of the two stimulus sources, A (vertical axis) and B (horizontal axis). Individuals were tested under the following conditions: no stimulus (black, N=16), stimulus A (blue, N=15), stimulus B (red, N=16), stimulus A then B (red circle with blue outline, N=15), and stimulus B then A (blue circle with red outline, N=14). In the latter two cases, the switch from one stimulus source to the other occurred after the first locomotor movement. Stimulus locations were as indicated in the inset. Cynthia M. Harley et al. J Exp Biol 2013;216:1890-1897 © 2013. Published by The Company of Biologists Ltd