Adaptations for nocturnal and diurnal vision in the hawkmoth lamina.
Stöckl, Anna LU ; Ribi, Willi and Warrant, Eric LU
(2016)
In Journal of Comparative Neurology
524(1).
p.160-175
- Abstract
- Animals use vision over a wide range of light intensities, from dim starlight to bright sunshine. For animals active in very dim light the visual system is challenged by several sources of visual noise. Adaptations in the eyes, as well as in the neural circuitry, have evolved to suppress the noise and enhance the visual signal, thereby improving vision in dim light. Among neural adaptations, spatial summation of visual signals from neighboring processing units is suggested to increase the reliability of signal detection and thus visual sensitivity. In insects, the likely neural candidates for carrying out spatial summation are the lamina monopolar cells (LMCs) of the first visual processing area of the insect brain (the lamina). We have... (More)
- Animals use vision over a wide range of light intensities, from dim starlight to bright sunshine. For animals active in very dim light the visual system is challenged by several sources of visual noise. Adaptations in the eyes, as well as in the neural circuitry, have evolved to suppress the noise and enhance the visual signal, thereby improving vision in dim light. Among neural adaptations, spatial summation of visual signals from neighboring processing units is suggested to increase the reliability of signal detection and thus visual sensitivity. In insects, the likely neural candidates for carrying out spatial summation are the lamina monopolar cells (LMCs) of the first visual processing area of the insect brain (the lamina). We have classified LMCs in three species of hawkmoths having considerably different activity periods but very similar ecology - the diurnal Macroglossum stellatarum, the nocturnal Deilephila elpenor and the crepuscular-nocturnal Manduca sexta. Using this classification, we investigated the anatomical adaptations of hawkmoth LMCs suited for spatial summation. We found that specific types of LMCs have dendrites extending to significantly more neighboring cartridges in the two nocturnal and crepuscular species than in the diurnal species, making these LMC types strong candidates for spatial summation. Moreover, while the absolute number of cartridges visited by the LMCs differed between the two dim-light species, their dendritic extents were very similar in terms of visual angle, possibly indicating a limiting spatial acuity. Interestingly, the overall size of the lamina neuropil did not correlate with the size of its LMCs. This article is protected by copyright. All rights reserved. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/7478392
- author
- Stöckl, Anna
LU
; Ribi, Willi
and Warrant, Eric
LU
- organization
- publishing date
- 2016
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Comparative Neurology
- volume
- 524
- issue
- 1
- pages
- 160 - 175
- publisher
- John Wiley & Sons Inc.
- external identifiers
-
- pmid:26100612
- wos:000365719500011
- scopus:84948102157
- pmid:26100612
- ISSN
- 1096-9861
- DOI
- 10.1002/cne.23832
- language
- English
- LU publication?
- yes
- id
- 64b95b2f-cb63-406b-894a-4f2e1e695fb6 (old id 7478392)
- date added to LUP
- 2016-04-01 10:45:19
- date last changed
- 2024-05-05 21:03:46
@article{64b95b2f-cb63-406b-894a-4f2e1e695fb6,
abstract = {{Animals use vision over a wide range of light intensities, from dim starlight to bright sunshine. For animals active in very dim light the visual system is challenged by several sources of visual noise. Adaptations in the eyes, as well as in the neural circuitry, have evolved to suppress the noise and enhance the visual signal, thereby improving vision in dim light. Among neural adaptations, spatial summation of visual signals from neighboring processing units is suggested to increase the reliability of signal detection and thus visual sensitivity. In insects, the likely neural candidates for carrying out spatial summation are the lamina monopolar cells (LMCs) of the first visual processing area of the insect brain (the lamina). We have classified LMCs in three species of hawkmoths having considerably different activity periods but very similar ecology - the diurnal Macroglossum stellatarum, the nocturnal Deilephila elpenor and the crepuscular-nocturnal Manduca sexta. Using this classification, we investigated the anatomical adaptations of hawkmoth LMCs suited for spatial summation. We found that specific types of LMCs have dendrites extending to significantly more neighboring cartridges in the two nocturnal and crepuscular species than in the diurnal species, making these LMC types strong candidates for spatial summation. Moreover, while the absolute number of cartridges visited by the LMCs differed between the two dim-light species, their dendritic extents were very similar in terms of visual angle, possibly indicating a limiting spatial acuity. Interestingly, the overall size of the lamina neuropil did not correlate with the size of its LMCs. This article is protected by copyright. All rights reserved.}},
author = {{Stöckl, Anna and Ribi, Willi and Warrant, Eric}},
issn = {{1096-9861}},
language = {{eng}},
number = {{1}},
pages = {{160--175}},
publisher = {{John Wiley & Sons Inc.}},
series = {{Journal of Comparative Neurology}},
title = {{Adaptations for nocturnal and diurnal vision in the hawkmoth lamina.}},
url = {{http://dx.doi.org/10.1002/cne.23832}},
doi = {{10.1002/cne.23832}},
volume = {{524}},
year = {{2016}},
}