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Minimum viewing angle for visually guided ground speed control in bumblebees.

Baird, Emily LU ; Kornfeldt, Torill LU and Dacke, Marie LU (2010) In Journal of Experimental Biology 213(10). p.1625-1632
Abstract
To control flight, flying insects extract information from the pattern of visual motion generated during flight, known as optic flow. To regulate their ground speed, insects such as honeybees and Drosophila hold the rate of optic flow in the axial direction (front-to-back) constant. A consequence of this strategy is that its performance varies with the minimum viewing angle (the deviation from the frontal direction of the longitudinal axis of the insect) at which changes in axial optic flow are detected. The greater this angle, the later changes in the rate of optic flow, caused by changes in the density of the environment, will be detected. The aim of the present study is to examine the mechanisms of ground speed control in bumblebees and... (More)
To control flight, flying insects extract information from the pattern of visual motion generated during flight, known as optic flow. To regulate their ground speed, insects such as honeybees and Drosophila hold the rate of optic flow in the axial direction (front-to-back) constant. A consequence of this strategy is that its performance varies with the minimum viewing angle (the deviation from the frontal direction of the longitudinal axis of the insect) at which changes in axial optic flow are detected. The greater this angle, the later changes in the rate of optic flow, caused by changes in the density of the environment, will be detected. The aim of the present study is to examine the mechanisms of ground speed control in bumblebees and to identify the extent of the visual range over which optic flow for ground speed control is measured. Bumblebees were trained to fly through an experimental tunnel consisting of parallel vertical walls. Flights were recorded when (1) the distance between the tunnel walls was either 15 or 30 cm, (2) the visual texture on the tunnel walls provided either strong or weak optic flow cues and (3) the distance between the walls changed abruptly halfway along the tunnel's length. The results reveal that bumblebees regulate ground speed using optic flow cues and that changes in the rate of optic flow are detected at a minimum viewing angle of 23-30 deg., with a visual field that extends to approximately 155 deg. By measuring optic flow over a visual field that has a low minimum viewing angle, bumblebees are able to detect and respond to changes in the proximity of the environment well before they are encountered. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
bumblebee, flight control, flight speed, ground speed, vision.
in
Journal of Experimental Biology
volume
213
issue
10
pages
1625 - 1632
publisher
The Company of Biologists Ltd
external identifiers
  • wos:000277212900008
  • scopus:77951751183
ISSN
1477-9145
DOI
10.1242/jeb.038802
language
English
LU publication?
yes
id
4f1514ce-d467-4e09-94e6-37c7989ebc08 (old id 1610677)
date added to LUP
2010-06-17 12:52:26
date last changed
2018-05-29 10:15:52
@article{4f1514ce-d467-4e09-94e6-37c7989ebc08,
  abstract     = {To control flight, flying insects extract information from the pattern of visual motion generated during flight, known as optic flow. To regulate their ground speed, insects such as honeybees and Drosophila hold the rate of optic flow in the axial direction (front-to-back) constant. A consequence of this strategy is that its performance varies with the minimum viewing angle (the deviation from the frontal direction of the longitudinal axis of the insect) at which changes in axial optic flow are detected. The greater this angle, the later changes in the rate of optic flow, caused by changes in the density of the environment, will be detected. The aim of the present study is to examine the mechanisms of ground speed control in bumblebees and to identify the extent of the visual range over which optic flow for ground speed control is measured. Bumblebees were trained to fly through an experimental tunnel consisting of parallel vertical walls. Flights were recorded when (1) the distance between the tunnel walls was either 15 or 30 cm, (2) the visual texture on the tunnel walls provided either strong or weak optic flow cues and (3) the distance between the walls changed abruptly halfway along the tunnel's length. The results reveal that bumblebees regulate ground speed using optic flow cues and that changes in the rate of optic flow are detected at a minimum viewing angle of 23-30 deg., with a visual field that extends to approximately 155 deg. By measuring optic flow over a visual field that has a low minimum viewing angle, bumblebees are able to detect and respond to changes in the proximity of the environment well before they are encountered.},
  author       = {Baird, Emily and Kornfeldt, Torill and Dacke, Marie},
  issn         = {1477-9145},
  keyword      = {bumblebee,flight control,flight speed,ground speed,vision.},
  language     = {eng},
  number       = {10},
  pages        = {1625--1632},
  publisher    = {The Company of Biologists Ltd},
  series       = {Journal of Experimental Biology},
  title        = {Minimum viewing angle for visually guided ground speed control in bumblebees.},
  url          = {http://dx.doi.org/10.1242/jeb.038802},
  volume       = {213},
  year         = {2010},
}