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Philos Trans R Soc B. When the parrots finished eating the reward, they were again given a signal to return to their perch, and the next trial commenced. The change in response times across trials was used in previous detour studies to study learning processes Lockman and Adams ; Wyrwicka A study testing common marmosets on a detour task around a transparent barrier found that success was determined by a combination of inhibitory skill and the ability to transfer the detour response from an opaque to a transparent barrier, where both skills are mediated by different brain regions Wallis et al. Song repertoire size in male song sparrows correlates with detour reaching, but not with other cognitive measures. This copy is for your personal non-commercial use only. To proceed to the testing stage, the birds had to fulfill a criterion of four out of five correct responses on consecutive trials following the criteria from MacLean et al.

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Both studies used the cylinder task, a detour-reaching test where food is presented behind a transparent barrier.

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Are parrots poor at motor self-regulation or is the cylinder task poor at measuring it?

The blue-throated macaws and the great green macaws were housed in eight aviaries, divided by species and age into five groups of two to eight individuals. However, the combined slopes of the great green macaws and the blue-headed macaws were significantly steeper than those of the African grey parrots and the blue-throated macaws GLMM: Introduction Inhibitory control—a core component of executive functions—operates at a range of levels from basic motor self-regulation to taxing self-control Diamond ; Beran Several parrot species are also known to perform on par with apes and corvids in various tests on physical and social cognition Auersperg et al. In the current study, as well as in those we replicated, the subjects received relatively few training trials on the opaque cylinder.

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