One-sided limb preference is linked to alternating-limb locomotion in anuran amphibians.

Amphibians provide a unique opportunity for identifying possible links between lateralized behaviors, locomotion, and phylogeny and for addressing the origin of lateralized behaviors of higher vertebrates. Five anuran species with different locomotive habits were tested for forelimb and hind limb preferences during 2 stereotyped behavior sequences--wiping a foreign object off their snout and righting themselves from the overturned position. The experiments were analyzed in a broader context of previous findings on anuran lateralization involving 11 anuran species that were studied within the same experimental paradigms. This analysis shows that one-sided forelimb and hind limb motor lateralization in anurans is strongly associated with alternating-limb locomotion and other unilateral limb activity. Conclusions reached for anuran amphibians may be applicable to other vertebrates possessing paired appendages-the degree of lateralization in motor response depends on the mode of locomotion used by a species.