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Adaptations for vision in dim light: impulse responses and bumps in nocturnal spider photoreceptor cells (Cupiennius salei Keys)

Pirhofer-Walzl, Karin; Warrant, Eric LU and Barth, Friedrich G (2007) In Journal of Comparative Physiology A 193(10). p.1081-1087
Abstract
The photoreceptor cells of the nocturnal spider Cupiennius salei were investigated by intracellular electrophysiology. (1) The responses of photoreceptor cells of posterior median (PM) and anterior median (AM) eyes to short (2 ms) light pulses showed long integration times in the dark-adapted and shorter integration times in the light-adapted state. (2) At very low light intensities, the photoreceptors responded to single photons with discrete potentials, called bumps, of high amplitude (2-20 mV). When measured in profoundly dark-adapted photoreceptor cells of the PM eyes these bumps showed an integration time of 128 +/- 35 ms (n = 7) whereas in dark-adapted photoreceptor cells of AM eyes the integration time was 84 +/- 13 ms (n = 8),... (More)
The photoreceptor cells of the nocturnal spider Cupiennius salei were investigated by intracellular electrophysiology. (1) The responses of photoreceptor cells of posterior median (PM) and anterior median (AM) eyes to short (2 ms) light pulses showed long integration times in the dark-adapted and shorter integration times in the light-adapted state. (2) At very low light intensities, the photoreceptors responded to single photons with discrete potentials, called bumps, of high amplitude (2-20 mV). When measured in profoundly dark-adapted photoreceptor cells of the PM eyes these bumps showed an integration time of 128 +/- 35 ms (n = 7) whereas in dark-adapted photoreceptor cells of AM eyes the integration time was 84 +/- 13 ms (n = 8), indicating that the AM eyes are intrinsically faster than the PM eyes. (3) Long integration times, which improve visual reliability in dim light, and large responses to single photons in the dark-adapted state, contribute to a high visual sensitivity in Cupiennius at night. This conclusion is underlined by a calculation of sensitivity that accounts for both anatomical and physiological characteristics of the eye. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Comparative Physiology A
volume
193
issue
10
pages
1081 - 1087
publisher
Springer
external identifiers
  • wos:000250064000007
  • scopus:35348898397
ISSN
1432-1351
DOI
10.1007/s00359-007-0263-5
language
English
LU publication?
yes
id
cd7164d4-cc49-4567-ac0b-676d982ce89d (old id 655198)
date added to LUP
2007-12-19 14:18:50
date last changed
2017-02-26 04:08:18
@article{cd7164d4-cc49-4567-ac0b-676d982ce89d,
  abstract     = {The photoreceptor cells of the nocturnal spider Cupiennius salei were investigated by intracellular electrophysiology. (1) The responses of photoreceptor cells of posterior median (PM) and anterior median (AM) eyes to short (2 ms) light pulses showed long integration times in the dark-adapted and shorter integration times in the light-adapted state. (2) At very low light intensities, the photoreceptors responded to single photons with discrete potentials, called bumps, of high amplitude (2-20 mV). When measured in profoundly dark-adapted photoreceptor cells of the PM eyes these bumps showed an integration time of 128 +/- 35 ms (n = 7) whereas in dark-adapted photoreceptor cells of AM eyes the integration time was 84 +/- 13 ms (n = 8), indicating that the AM eyes are intrinsically faster than the PM eyes. (3) Long integration times, which improve visual reliability in dim light, and large responses to single photons in the dark-adapted state, contribute to a high visual sensitivity in Cupiennius at night. This conclusion is underlined by a calculation of sensitivity that accounts for both anatomical and physiological characteristics of the eye.},
  author       = {Pirhofer-Walzl, Karin and Warrant, Eric and Barth, Friedrich G},
  issn         = {1432-1351},
  language     = {eng},
  number       = {10},
  pages        = {1081--1087},
  publisher    = {Springer},
  series       = {Journal of Comparative Physiology A},
  title        = {Adaptations for vision in dim light: impulse responses and bumps in nocturnal spider photoreceptor cells (Cupiennius salei Keys)},
  url          = {http://dx.doi.org/10.1007/s00359-007-0263-5},
  volume       = {193},
  year         = {2007},
}