Premium
Effects of site of tactile stimulation on the escape swimming responses of hatchling Xenopus laevis embryos
Author(s) -
Boothby K. M.,
Roberts A.
Publication year - 1995
Publication title -
journal of zoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0952-8369
DOI - 10.1111/j.1469-7998.1995.tb05132.x
Subject(s) - xenopus , stimulus (psychology) , hatchling , biology , stimulation , sensory stimulation therapy , neuroscience , sensory system , anatomy , psychology , hatching , ecology , biochemistry , gene , psychotherapist
Hatchling Xenopus laevis embryos usually swim when the skin is touched with a fine hair. Less common are small, local V‐flexions and more general C‐flexions. Simple flexions or the initial flexion at the start of swimming occur predominantly on the opposite side to the stimulus to direct the animal away from the stimulus. Strokes to the midline lead to random sidedness of responses. The reliability of the sidedness of flexions and the first flexions of swimming decreases the more rostrally the stimuli are given. The range of directions of swimming paths are larger with more rostral stimuli so responses to head stimuli are unpredictable in direction. In animals immobilized in α‐bungarotoxin, strokes to the skin produce electrically recorded motor output which corresponds to: V‐flexions, C‐flexions and swimming. Fictive activity generally starts on the side opposite to the stimulus. The fictive responses suggest that the three basic behaviour patterns observed can be generated entirely within the central nervous system without any sensory feedback. We discuss possible mechanisms for the generation of ‘protean’ responses to head stimulation which are unpredictable in direction.