Apr 25, 2006

Complementary and lateralized forms of processing in Bufo marinus for novel and familiar prey

Neurobiology of Learning and Memory
Andrew Robins, Lesley J Rogers

Abstract

Amphibian vision is one of the most comprehensively studied of all vertebrate sensory systems. However, the processes of object recognition and memory in anuran amphibians have resisted satisfactory explanation. Our research shows that insight to the issue of visual discrimination and recognition in toads may be gained by investigation of the specialized and complementary functions carried out by the left and right brain hemispheres. We report that specialized processes associated with the left eye (right hemisphere) of the Bufo marinus toad carry out decisions to view and strike at complex prey stimuli recognized as 'novel.' This was demonstrated in the toads' preferences when provided a choice between identical novel insect models presented simultaneously into the left and right lateral, monocular visual fields. In a second experiment, videotaped trials of toad groups competing in an open field for live crickets were analysed for lateralized prey-catching behaviour. Concomitant with a preference for directing agonistic strikes at conspecifics within the left visual hemifield, toads were found to possess a significant preference for directing predatory responses at the familiar prey viewed in the right visual hemifield. The pr...Continue Reading

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Mentioned in this Paper

Vertebrates
Right Upper Arm Structure
Rana pipiens
Cophixalus ornatus
Muscle Rigidity
Right Brain
Amphibians
Girardinus falcatus
Cephalopterus ornatus
Pattern Recognition, Visual

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