Dynamic analysis of the righting reflex in toads; recovery after hemilabyrinthectomy

O. Macadar, I. Trabal, D. Cibils, J. V. Echagüe, Alberto E. Pereda, R. Budelli

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Static and dynamic measurements of the righting reflex were performed in intact toads (Bufo arenarum platensis) and at different stages of recovery from hemilabyrinthectomy. Reflex activity was evaluated by the toad's capacity to maintain a horizontal head position while rolled sideways. Static data were obtained from frontal photographs. In dynamic experiments platform position (stimulus) was measured through a potentiometer, while a linear accelerometer glued to the cranium was used to record head tilts. The dynamic study included a linear systems analysis using sinusoids of 0.5–3 Hz with rolls of up to 30° to each side. Hemilabyrinthectomy produced a head tilt towards the lesioned side, and gain decay and phase lag increase in the dynamic response. All postural defects recovered progressively within 30–60 days as already described in other species. Nevertheless, the tonic head deviation produced by dynamic stimuli of frequencies above 1 Hz did not recover. This remnant defect has not been observed in previous studies in which only static observations were performed. The involvement of a frequency-dependent rectifying mechanism in postural compensation is discussed.

Original languageEnglish (US)
Pages (from-to)395-402
Number of pages8
JournalRestorative Neurology and Neuroscience
Volume1
Issue number6
DOIs
StatePublished - 1990
Externally publishedYes

Fingerprint

Righting Reflex
Anura
Head
Bufo arenarum
Systems Analysis
Skull
Reflex

Keywords

  • Dynamic response
  • Hemilabyrinthectomy
  • Plasticity
  • Restoration
  • Righting reflex
  • Vestibular

ASJC Scopus subject areas

  • Neurology
  • Developmental Neuroscience
  • Clinical Neurology

Cite this

Dynamic analysis of the righting reflex in toads; recovery after hemilabyrinthectomy. / Macadar, O.; Trabal, I.; Cibils, D.; Echagüe, J. V.; Pereda, Alberto E.; Budelli, R.

In: Restorative Neurology and Neuroscience, Vol. 1, No. 6, 1990, p. 395-402.

Research output: Contribution to journalArticle

Macadar, O. ; Trabal, I. ; Cibils, D. ; Echagüe, J. V. ; Pereda, Alberto E. ; Budelli, R. / Dynamic analysis of the righting reflex in toads; recovery after hemilabyrinthectomy. In: Restorative Neurology and Neuroscience. 1990 ; Vol. 1, No. 6. pp. 395-402.
@article{d6d633c8fcc146aa9b93bb2878d0b6d8,
title = "Dynamic analysis of the righting reflex in toads; recovery after hemilabyrinthectomy",
abstract = "Static and dynamic measurements of the righting reflex were performed in intact toads (Bufo arenarum platensis) and at different stages of recovery from hemilabyrinthectomy. Reflex activity was evaluated by the toad's capacity to maintain a horizontal head position while rolled sideways. Static data were obtained from frontal photographs. In dynamic experiments platform position (stimulus) was measured through a potentiometer, while a linear accelerometer glued to the cranium was used to record head tilts. The dynamic study included a linear systems analysis using sinusoids of 0.5–3 Hz with rolls of up to 30° to each side. Hemilabyrinthectomy produced a head tilt towards the lesioned side, and gain decay and phase lag increase in the dynamic response. All postural defects recovered progressively within 30–60 days as already described in other species. Nevertheless, the tonic head deviation produced by dynamic stimuli of frequencies above 1 Hz did not recover. This remnant defect has not been observed in previous studies in which only static observations were performed. The involvement of a frequency-dependent rectifying mechanism in postural compensation is discussed.",
keywords = "Dynamic response, Hemilabyrinthectomy, Plasticity, Restoration, Righting reflex, Vestibular",
author = "O. Macadar and I. Trabal and D. Cibils and Echag{\"u}e, {J. V.} and Pereda, {Alberto E.} and R. Budelli",
year = "1990",
doi = "10.3233/RNN-1990-1604",
language = "English (US)",
volume = "1",
pages = "395--402",
journal = "Restorative Neurology and Neuroscience",
issn = "0922-6028",
publisher = "IOS Press",
number = "6",

}

TY - JOUR

T1 - Dynamic analysis of the righting reflex in toads; recovery after hemilabyrinthectomy

AU - Macadar, O.

AU - Trabal, I.

AU - Cibils, D.

AU - Echagüe, J. V.

AU - Pereda, Alberto E.

AU - Budelli, R.

PY - 1990

Y1 - 1990

N2 - Static and dynamic measurements of the righting reflex were performed in intact toads (Bufo arenarum platensis) and at different stages of recovery from hemilabyrinthectomy. Reflex activity was evaluated by the toad's capacity to maintain a horizontal head position while rolled sideways. Static data were obtained from frontal photographs. In dynamic experiments platform position (stimulus) was measured through a potentiometer, while a linear accelerometer glued to the cranium was used to record head tilts. The dynamic study included a linear systems analysis using sinusoids of 0.5–3 Hz with rolls of up to 30° to each side. Hemilabyrinthectomy produced a head tilt towards the lesioned side, and gain decay and phase lag increase in the dynamic response. All postural defects recovered progressively within 30–60 days as already described in other species. Nevertheless, the tonic head deviation produced by dynamic stimuli of frequencies above 1 Hz did not recover. This remnant defect has not been observed in previous studies in which only static observations were performed. The involvement of a frequency-dependent rectifying mechanism in postural compensation is discussed.

AB - Static and dynamic measurements of the righting reflex were performed in intact toads (Bufo arenarum platensis) and at different stages of recovery from hemilabyrinthectomy. Reflex activity was evaluated by the toad's capacity to maintain a horizontal head position while rolled sideways. Static data were obtained from frontal photographs. In dynamic experiments platform position (stimulus) was measured through a potentiometer, while a linear accelerometer glued to the cranium was used to record head tilts. The dynamic study included a linear systems analysis using sinusoids of 0.5–3 Hz with rolls of up to 30° to each side. Hemilabyrinthectomy produced a head tilt towards the lesioned side, and gain decay and phase lag increase in the dynamic response. All postural defects recovered progressively within 30–60 days as already described in other species. Nevertheless, the tonic head deviation produced by dynamic stimuli of frequencies above 1 Hz did not recover. This remnant defect has not been observed in previous studies in which only static observations were performed. The involvement of a frequency-dependent rectifying mechanism in postural compensation is discussed.

KW - Dynamic response

KW - Hemilabyrinthectomy

KW - Plasticity

KW - Restoration

KW - Righting reflex

KW - Vestibular

UR - http://www.scopus.com/inward/record.url?scp=84974750267&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84974750267&partnerID=8YFLogxK

U2 - 10.3233/RNN-1990-1604

DO - 10.3233/RNN-1990-1604

M3 - Article

AN - SCOPUS:84974750267

VL - 1

SP - 395

EP - 402

JO - Restorative Neurology and Neuroscience

JF - Restorative Neurology and Neuroscience

SN - 0922-6028

IS - 6

ER -