BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//wp-events-plugin.com//7.2.3.1//EN
TZID:Europe/Paris
X-WR-TIMEZONE:Europe/Paris
BEGIN:VEVENT
UID:6576@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20210120T140000
DTEND;TZID=Europe/Paris:20210120T150000
DTSTAMP:20241120T201744Z
URL:https://www.i2m.univ-amu.fr/evenements/aerial-righting-reflex-in-hover
 flies-and-gravity-perception-stephane-viollet/
SUMMARY:Stéphane Viollet (ISM\, CNRS and Aix-Marseille Université\, Marse
 ille\, France): Aerial righting reflex in hoverflies and gravity perceptio
 n - Stéphane Viollet
DESCRIPTION:Stéphane Viollet: Recent studies carried out at our laboratory
  focused on gravity perception in hoverflies. Gravity perception in flying
  insects has mainly been studied in terms of grounded animals’ tactile o
 rientation responses\, but it has not yet been established whether hoverfl
 ies use gravity perception cues to detect a nearly weightless state at an 
 early stage or even to stabilize their flight. Once dropped in free fall\,
  hoverflies frequently initiated wingbeats but managed to avoid crashing o
 nly in variably structured visual environments [1]. We have also shown tha
 t the position of the lighting (overhead or bottom lighting) significantly
  affected both the stabilization rates and the time taken by the flies to 
 stabilize [2]. Behavioural data have suggested that the vertical optic flo
 w plays a key role in this anti-crash response. Free fall behavior analyse
 s have also suggested that flying insect may not rely on graviception to s
 tabilize their flight. Based on these two assumptions\, we have developed 
 a model which accounts for hoverflies ́ position and pitch orientation [3
 ]. Finally\, I will present results and model about the righting reflex in
  hoverflies. It was observed here for the first time [4] that hoverfly reo
 rientation is entirely achieved within 6 wingbeats (48.8 ms) at angular ro
 ll velocities of up to 10×10^3 deg s−1. The fundamental role of the hal
 teres will be discussed.\n[1] R. Goulard\, J-L. Vercher and S. Viollet (20
 16)\, To crash or not to crash: how do hoverflies cope with free-fall situ
 ations and weightlessness?\, J. of Experimental Biology\, vol. 219\, 2497-
 2503.\n[2] R. Goulard\, A. Verbe\, J-L. Vercher and S. Viollet (2018)\, Co
 ntribution of the Dorsal Light Response to freely falling hoverflies’ fl
 ight stabilization strategy\, Biology Letters\, 14: 20180051.\n[3] R. Goul
 ard\, J-L. Vercher and S. Viollet (2018)\, Modeling visual-based pitch\, l
 ift and speed control strategies in hoverflies\, PloS Computational Biolog
 y\, 4(1): e1005894.\n[4] A. Verbe\, L. Varennes\, J-L Vercher and S. Violl
 et (2020) How do hoverflies use their righting reflex?\, J. of Experimenta
 l Biology\, vol. 223:jeb215327.\n&nbsp\;\n\nIOSSB Seminar
ATTACH;FMTTYPE=image/jpeg:https://www.i2m.univ-amu.fr/wp-content/uploads/2
 020/11/Stephane_Viollet.jpg
CATEGORIES:Interdisciplinary online seminar series on
 Biolocomotion,Virtual event
END:VEVENT
BEGIN:VTIMEZONE
TZID:Europe/Paris
X-LIC-LOCATION:Europe/Paris
BEGIN:STANDARD
DTSTART:20201025T020000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
END:STANDARD
END:VTIMEZONE
END:VCALENDAR