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Journal of Experimental Biology 53,255-263 (1970)
Published by Company of Biologists 1970

Diagonal Locomotion in De-Afferentated Toads

ELNORA SMITH HARCOMBE 1 and ROBERT J. WYMAN 2

1 Biology Department, Yale University, New Haven, Connecticut 06520
2 Biology Department, Yale University New Haven, Connecticut 06520

1. Twenty-eight toads (B. marinus) were de-afferentated by severing all spinal dorsal roots.

2. Every animal made locomotory movements of one kind or another. The normal diagonal pattern was observed fairly often; and, once initiated, this pattern was usually maintained until the animal stopped walking.

3. When a toad made any protraction movement following three steps of the normal pattern, then the fourth step was the appropriate step for the sequence in 66% of cases. When the preceding steps followed the normal pattern, the fifth step was correct in 67% of cases; the sixth in 62%; the seventh in 81% and the eighth in 41%. Random movement predicts 25% in all these cases.

4. It is concluded that spinal afferents are not necessary for the co-ordination of diagonal locomotion.

Submitted on April 2, 1970


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© The Company of Biologists Ltd 1970