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Ontogenetic aspects on visual "size-constancy" phenomena in the midwife toad Alytes obstetricans (Laur.). 1979

J P Ewert, and H Burghagen

About 2 weeks after metamorphosis, midwife toads Alytes obstetricans judge the size of a prey object mainly in scales of visual angle. For distant objects they show a tendency to respond to absolute object size. About 6 months later the juvenile animals are able to judge absolute prey size in relation to the stimulus distance ("size constancy" phenomenon). This ability is not necessarily based on learning or previous experience.

UI MeSH Term Description Entries
D008675 Metamorphosis, Biological Profound physical changes during maturation of living organisms from the immature forms to the adult forms, such as from TADPOLES to frogs; caterpillars to BUTTERFLIES. Biological Metamorphosis,Biological Metamorphoses,Metamorphoses, Biological
D010364 Pattern Recognition, Visual Mental process to visually perceive a critical number of facts (the pattern), such as characters, shapes, displays, or designs. Recognition, Visual Pattern,Visual Pattern Recognition
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001001 Anura An order of the class Amphibia, which includes several families of frogs and toads. They are characterized by well developed hind limbs adapted for jumping, fused head and trunk and webbed toes. The term "toad" is ambiguous and is properly applied only to the family Bufonidae. Bombina,Frogs and Toads,Salientia,Toad, Fire-Bellied,Toads and Frogs,Anuras,Fire-Bellied Toad,Fire-Bellied Toads,Salientias,Toad, Fire Bellied,Toads, Fire-Bellied
D001522 Behavior, Animal The observable response an animal makes to any situation. Autotomy Animal,Animal Behavior,Animal Behaviors
D012858 Size Perception The sensory interpretation of the dimensions of objects. Perception, Size,Perceptions, Size,Size Perceptions
D014796 Visual Perception The selecting and organizing of visual stimuli based on the individual's past experience. Visual Processing,Perception, Visual,Processing, Visual

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