共查询到5条相似文献,搜索用时 0 毫秒
1.
This study investigated whether Asian elephants can make relative quantity judgment (RQJ), a dichotomous judgment of unequal
quantities ordered in magnitude. In Experiment 1, elephants were simultaneously shown two baskets with differing quantities
of bait (up to 6 items). In Experiment 2, elephants were sequentially presented with baits, which could not be seen by elephants
in their total quantities. The task of elephants was to choose the larger quantity in both experiments. Results showed that
the elephants chose the larger quantity with significantly greater frequency. Interestingly, the elephants did not exhibit
disparity or magnitude effects, in which performance declines with a smaller difference between quantities in a two-choice
task, or the total quantity increases, respectively. These findings appear to be inconsistent with the previous reports of
RQJ in other animals, suggesting that elephants may be using a different mechanism to compare and represent quantities than
previously suggested for other species. 相似文献
2.
Chu Pui Ching Wierucka Kaja Murphy Derek Tilley Hannah Bethany Mumby Hannah Sue 《Animal cognition》2023,26(2):393-404
Animal Cognition - Experiments are widely used to investigate the behaviour and cognition of animals. While the automation of experiments to avoid potential experimenter bias is sometimes possible,... 相似文献
3.
PurposeTo compare hip extensor strength and corticomotor excitability (CME) of gluteus maximus (GM) between males and females. A secondary purpose was to determine if CME of GM is predictive of hip extensor strength.MethodThirty-two healthy individuals participated (15 males and 17 females). CME of GM was assessed using the input-output curve (IOC) procedure acquired from transcranial magnetic stimulation (average slope). Hip extensor strength was measured by a dynamometer during a maximal voluntary isometric contraction. Independent t-tests were used to compare CME of GM and peak hip extensor torque between males and females. Linear regression analysis was used to determine whether peak hip extensor torque was predicted by CME of GM.ResultCompared to males, females demonstrate lower peak hip extensor torque (4.42 ± 1.11 vs. 6.15 ± 1.72 Nm/kg/m2, p < 0.01) and lower CME of GM (1.36 ± 1.07 vs. 2.67 ± 1.30, p < 0.01). CME of GM was a significant predictor of peak hip extensor torque for males and females combined (r2 = 0.36, p < 0.001).ConclusionOur findings support the premise that corticomotor excitability plays a role in the ability of a muscle to generate torque. 相似文献
4.
In this article, the side preferences of feeding-related trunk movements of free-ranging Asian elephants (Elephas maximus) were investigated for the first time. It is hypothesized that a functional asymmetry of the trunk is necessary to perform skillful feeding movements more efficiently. This might be connected with a corresponding hemispheric specialization. Video recordings of 41 wild elephants provided frequencies and durations of the following trunk-movement categories: object contact, retrieval, and reaching. In each category, individual side preferences were found. The strength of side preferences varied between the trunk-movement categories and the sexes. Mean durations of retrieval and reaching correlated negatively with the strength of side biases. Comparing the side preferences in the unpaired trunk with analogous phenomena in other unpaired grasping organs and in primate handedness. the authors discuss possible explanations for the evolution of asymmetries in unpaired grasping organs. 相似文献
5.
Snyder Rebecca J. Barrett Lisa P. Emory Rachel A. Perdue Bonnie M. 《Animal cognition》2021,24(5):1121-1131
Animal Cognition - Using an object-choice task, we measured the relative quantity discrimination ability of Asian elephants. Two zoo-housed elephants were given auditory cues of food being dropped... 相似文献