Quick Search:

uzh logo
Browse by:
bullet
bullet
bullet
bullet

Zurich Open Repository and Archive 

Graetzel, C F; Nelson, B J; Fry, S N (2010). Frequency response of lift control in Drosophila. Journal of the Royal Society. Interface, 7(52):1603-1616.

Full text not available from this repository.

Abstract

The flight control responses of the fruitfly represent a powerful model system to explore neuromotor control mechanisms, whose system level control properties can be suitably characterized with a frequency response analysis. We characterized the lift response dynamics of tethered flying Drosophila in presence of vertically oscillating visual patterns, whose oscillation frequency we varied between 0.1 and 13 Hz. We justified these measurements by showing that the amplitude gain and phase response is invariant to the pattern oscillation amplitude and spatial frequency within a broad dynamic range. We also showed that lift responses are largely linear and time invariant (LTI), a necessary condition for a meaningful analysis of frequency responses and a remarkable characteristic given its nonlinear constituents. The flies responded to increasing oscillation frequencies with a roughly linear decrease in response gain, which dropped to background noise levels at about 6 Hz. The phase lag decreased linearly, consistent with a constant reaction delay of 75 ms. Next, we estimated the free-flight response of the fly to generate a Bode diagram of the lift response. The limitation of lift control to frequencies below 6 Hz is explained with inertial body damping, which becomes dominant at higher frequencies. Our work provides the detailed background and techniques that allow optomotor lift responses of Drosophila to be measured with comparatively simple, affordable and commercially available techniques. The identification of an LTI, pattern velocity dependent, lift control strategy is relevant to the underlying motion computation mechanisms and serves a broader understanding of insects' flight control strategies. The relevance and potential pitfalls of applying system identification techniques in tethered preparations is discussed.

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Neuroinformatics
DDC:570 Life sciences; biology
Uncontrolled Keywords:system identification;flight control;micro-electro-mechanical systems
Language:English
Date:November 2010
Deposited On:04 Mar 2011 15:49
Last Modified:27 Nov 2013 20:09
Publisher:The Royal Society
Series Name:Interface
Number of Pages:13
ISSN:1742-5662
Publisher DOI:10.1098/rsif.2010.0040
Citations:Web of Science®. Times Cited: 6
Google Scholar™
Scopus®. Citation Count: 10

Users (please log in): suggest update or correction for this item

Repository Staff Only: item control page