Wipe and flexion withdrawal reflexes display different EMG patterns prior to movement onset in the spinalized frog

J. L. Schotland, W. A. Lee, W. Z. Rymer*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We investigated the hypotheses (1) that the initial flexion part of the wipe reflex elicited in the spinalized frog has the same EMG pattern for wipes to different target locations (Berkinblit et al. 1986), thereby reducing the complexity of the control of this task, and (2) that this initial flexion is the same as occurs in the flexion withdrawal reflex (Easton 1972). The activities of seven muscles of the hindlimb of the spinal frog were recorded via intramuscular electromyograms (EMGs) during the wipe reflex to two target locations and during the flexion withdrawal reflex. The EMGs were analyzed during the interval between stimulus placement and movement onset for mean integrated EMG and duration from EMG onset to movement onset. This analysis revealed significant differences (p<0.0001) in the EMG patterns that preceded the initial flexion posture for all three movements. These findings suggest that the spinal circuitry coordinating the initial flexion part of the wipe reflex to different target locations and the flexion withdrawal reflex may not be uniformly shared.

Original languageEnglish (US)
Pages (from-to)649-653
Number of pages5
JournalExperimental Brain Research
Volume78
Issue number3
DOIs
StatePublished - Dec 1989

Keywords

  • Electromyography
  • Flexion withdrawal reflex
  • Motor control
  • Spinal frog
  • Wipe reflex

ASJC Scopus subject areas

  • Neuroscience(all)

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