Pitch perfect: How fruit flies control their body pitch angle

Samuel C. Whitehead*, Tsevi Beatus, Luca Canale, Itai Cohen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Flapping insect flight is a complex and beautiful phenomenon that relies on fast, active control mechanisms to counter aerodynamic instability. To directly investigate how freely flying Drosophila melanogaster control their body pitch angle against such instability, we perturbed them using impulsive mechanical torques and filmed their corrective maneuvers with high-speed video. Combining experimental observations and numerical simulation, we found that flies correct for pitch deflections of up to 40 deg in 29±8 ms by bilaterally modulating their wings' front-most stroke angle in a manner well described by a linear proportional-integral (PI) controller. Flies initiate this corrective process only 10±2 ms after the perturbation onset, indicating that pitch stabilization involves a fast reflex response. Remarkably, flies can also correct for very largeamplitude pitch perturbations - greater than 150 deg - providing a regime in which to probe the limits of the linear-response framework. Together with previous studies regarding yaw and roll control, our results on pitch show that flies' stabilization of each of these body angles is consistent with PI control.

Original languageAmerican English
Pages (from-to)3508-3519
Number of pages12
JournalJournal of Experimental Biology
Volume218
Issue number21
DOIs
StatePublished - 1 Nov 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015. Published by The Company of Biologists Ltd.

Keywords

  • Bio-locomotion
  • Drosophila melanogaster
  • Flight control
  • Insect flight
  • Linear control

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