Residual circadian rhythmicity after bilateral lamina-medulla removal or optic stalk transection in the cricket, Gryllus bimaculatus

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Abstract

Bilateral optic stalk severance or lamina-medulla region removal were carried out in 47 adult male crickets Gryllus bimaculatus DeGeer. Effects of the operations on circadian locomotor activity were investigated under 12 h light: 12 h dark and at a constant temperature of 26°C. In the pre-operative days, 39 of the animals showed a typical nocturnal activity rhythm (normal rhythm), but the remaining 8 exhibited an atypical rhythm which is diurnal rather than nocturnal (abnormal rhythm). The operations eventually caused an arrhythmicity in all animals, suggesting that the crucial part of the central nervous system controlling the cricket circadian activity is located in the lamina-medulla region. However, in some of the post-operative crickets, the rhythm did not immediately disappear but persisted for a while: the diurnal increase of activity was observed up to 2 weeks in all 8 abnormal- and 4 normal-rhythm animals. In addition, 8 out of 39 normal-rhythm animals showed a single well-defined post-operative peak which occurred approximately in phase with the nocturnal peak prior to surgery. These results are discussed in relation to a possibility of involvement of the oscillatory structure outside the optic lobes.

Original languageEnglish
Pages (from-to)653-657
Number of pages5
JournalJournal of Insect Physiology
Volume31
Issue number8
DOIs
Publication statusPublished - 1985
Externally publishedYes

Fingerprint

Gryllidae
Gryllus bimaculatus
laminae (animals)
Periodicity
optics
animals
optic lobe
nocturnal activity
Locomotion
central nervous system
locomotion
Central Nervous System
surgery
Light
Temperature
temperature

Keywords

  • circadian locomotor rhythm
  • Cricket
  • optic lobe
  • residual rhythm

ASJC Scopus subject areas

  • Insect Science
  • Physiology

Cite this

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title = "Residual circadian rhythmicity after bilateral lamina-medulla removal or optic stalk transection in the cricket, Gryllus bimaculatus",
abstract = "Bilateral optic stalk severance or lamina-medulla region removal were carried out in 47 adult male crickets Gryllus bimaculatus DeGeer. Effects of the operations on circadian locomotor activity were investigated under 12 h light: 12 h dark and at a constant temperature of 26°C. In the pre-operative days, 39 of the animals showed a typical nocturnal activity rhythm (normal rhythm), but the remaining 8 exhibited an atypical rhythm which is diurnal rather than nocturnal (abnormal rhythm). The operations eventually caused an arrhythmicity in all animals, suggesting that the crucial part of the central nervous system controlling the cricket circadian activity is located in the lamina-medulla region. However, in some of the post-operative crickets, the rhythm did not immediately disappear but persisted for a while: the diurnal increase of activity was observed up to 2 weeks in all 8 abnormal- and 4 normal-rhythm animals. In addition, 8 out of 39 normal-rhythm animals showed a single well-defined post-operative peak which occurred approximately in phase with the nocturnal peak prior to surgery. These results are discussed in relation to a possibility of involvement of the oscillatory structure outside the optic lobes.",
keywords = "circadian locomotor rhythm, Cricket, optic lobe, residual rhythm",
author = "Kenji Tomioka",
year = "1985",
doi = "10.1016/0022-1910(85)90065-4",
language = "English",
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pages = "653--657",
journal = "Journal of Insect Physiology",
issn = "0022-1910",
publisher = "Elsevier Limited",
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T1 - Residual circadian rhythmicity after bilateral lamina-medulla removal or optic stalk transection in the cricket, Gryllus bimaculatus

AU - Tomioka, Kenji

PY - 1985

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N2 - Bilateral optic stalk severance or lamina-medulla region removal were carried out in 47 adult male crickets Gryllus bimaculatus DeGeer. Effects of the operations on circadian locomotor activity were investigated under 12 h light: 12 h dark and at a constant temperature of 26°C. In the pre-operative days, 39 of the animals showed a typical nocturnal activity rhythm (normal rhythm), but the remaining 8 exhibited an atypical rhythm which is diurnal rather than nocturnal (abnormal rhythm). The operations eventually caused an arrhythmicity in all animals, suggesting that the crucial part of the central nervous system controlling the cricket circadian activity is located in the lamina-medulla region. However, in some of the post-operative crickets, the rhythm did not immediately disappear but persisted for a while: the diurnal increase of activity was observed up to 2 weeks in all 8 abnormal- and 4 normal-rhythm animals. In addition, 8 out of 39 normal-rhythm animals showed a single well-defined post-operative peak which occurred approximately in phase with the nocturnal peak prior to surgery. These results are discussed in relation to a possibility of involvement of the oscillatory structure outside the optic lobes.

AB - Bilateral optic stalk severance or lamina-medulla region removal were carried out in 47 adult male crickets Gryllus bimaculatus DeGeer. Effects of the operations on circadian locomotor activity were investigated under 12 h light: 12 h dark and at a constant temperature of 26°C. In the pre-operative days, 39 of the animals showed a typical nocturnal activity rhythm (normal rhythm), but the remaining 8 exhibited an atypical rhythm which is diurnal rather than nocturnal (abnormal rhythm). The operations eventually caused an arrhythmicity in all animals, suggesting that the crucial part of the central nervous system controlling the cricket circadian activity is located in the lamina-medulla region. However, in some of the post-operative crickets, the rhythm did not immediately disappear but persisted for a while: the diurnal increase of activity was observed up to 2 weeks in all 8 abnormal- and 4 normal-rhythm animals. In addition, 8 out of 39 normal-rhythm animals showed a single well-defined post-operative peak which occurred approximately in phase with the nocturnal peak prior to surgery. These results are discussed in relation to a possibility of involvement of the oscillatory structure outside the optic lobes.

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KW - residual rhythm

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