Vision fine-tunes preparation for landing in the cane toad,Rhinella marina
| Autor: | Gary B. Gillis, Chris Panzini, Laura J. Ekstrom |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Vestibular system medicine.medical_specialty Proprioception Motor control Sensory system Kinematics Biology biology.organism_classification 010603 evolutionary biology 01 natural sciences Agricultural and Biological Sciences (miscellaneous) Cane toad 03 medical and health sciences 0302 clinical medicine medicine.anatomical_structure Physical medicine and rehabilitation medicine Forelimb Muscle activity General Agricultural and Biological Sciences 030217 neurology & neurosurgery |
| Zdroj: | Biology Letters. 14:20180397 |
| ISSN: | 1744-957X 1744-9561 |
| DOI: | 10.1098/rsbl.2018.0397 |
| Popis: | In toad hopping, the hindlimbs generate the propulsive force for take-off while the forelimbs resist the impact forces associated with landing. Preparing to perform a safe landing, in which impact forces are managed appropriately, likely involves the integration of multiple types of sensory feedback. In toads, vestibular and/or proprioceptive feedback is critical for coordinated landing; however, the role of vision remains unclear. To clarify this, we compare pre-landing forelimb muscle activation patterns before and after removing vision. Specifically, we recorded EMG activity from two antagonistic forelimb muscles, the anconeus and coracoradialis, which demonstrate distance-dependent onset timing and recruitment intensity, respectively. Toads were first recorded hopping normally and then again after their optic nerves were severed to remove visual feedback. When blind, toads exhibited hop kinematics and pre-landing muscle activity similar to when sighted. However, distance-dependent relationships for muscle activity patterns were more variable, if present at all. This study demonstrates that blind toads are still able to perform coordinated landings, reinforcing the importance of proprioceptive and/or vestibular feedback during hopping. But the increased variability in distance-dependent activity patterns indicates that vision is more responsible for fine-tuning the motor control strategy for landing. |
| Databáze: | OpenAIRE |
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