![]() Almost every study of this research field has been conducted in laboratories adopting two different methodological approaches: a spontaneous choice test or a training procedure. In fact, the possibility exists that the illusory perception is influenced by the different methodologies and the test design. ![]() Indeed, the different studies often used different methodologies that could have potentially introduced confounding factors. Besides the differentiation of the perceptual mechanisms, another explanation could be taken into account. The studies conducted so far have provided contradictory results, suggesting that the underlying perceptual mechanisms may differ across species. In recent decades, visual illusions have been used in behavioural research to compare the perception between different vertebrate species. Although we live on the same planet, there are countless different ways of seeing the surroundings that reflect the different individual experiences and selective pressures.
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