Journal of Comparative Physiology A

, Volume 198, Issue 2, pp 119–127 | Cite as

Electroencephalogram bands modulated by vigilance states in an anuran species: a factor analytic approach

  • Guangzhan Fang
  • Qin Chen
  • Jianguo Cui
  • Yezhong Tang
Original Paper

Abstract

Dramatic changes in neocortical electroencephalogram (EEG) rhythms are associated with the sleep–waking cycle in mammals. Although amphibians are thought to lack a neocortical homologue, changes in rest–activity states occur in these species. In the present study, EEG signals were recorded from the surface of the cerebral hemispheres and midbrain on both sides of the brain in an anuran species, Babina daunchina, using electrodes contacting the meninges in order to measure changes in mean EEG power across behavioral states. Functionally relevant frequency bands were identified using factor analysis. The results indicate that: (1) EEG power was concentrated in four frequency bands during the awake or active state and in three frequency bands during rest; (2) EEG bands in frogs differed substantially from humans, especially in the fast frequency band; (3) bursts similar to mammalian sleep spindles, which occur in non-rapid eye movement mammalian sleep, were observed when frogs were at rest suggesting sleep spindle-like EEG activity appeared prior to the evolution of mammals.

Keywords

Electroencephalogram (EEG) bands Factor analysis Power spectra Sleep spindle Frog 

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Guangzhan Fang
    • 1
  • Qin Chen
    • 1
  • Jianguo Cui
    • 1
  • Yezhong Tang
    • 1
  1. 1.Department of Herpetology, Chengdu Institute of BiologyChinese Academy of SciencesChengduPeople’s Republic of China

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