Supplemental Material for Distinct Perceptuomotor Features of Percussive Tooling in Humans (Homo sapiens) and Wild Bearded Capuchin Monkeys (Sapajus libidinosus)

2019 ◽  
Keyword(s):  
Homo Sapiens ◽  
Capuchin Monkeys

Exploring the Jastrow Illusion in Humans (Homo sapiens), Rhesus Monkeys (Macaca mulatta), and Capuchin Monkeys (Sapajus apella)

Perception ◽  
2019 ◽  
Vol 48 (5) ◽  
pp. 367-385 ◽  
Author(s):  
Christian Agrillo ◽  
Michael J. Beran ◽  
Audrey E. Parrish
Keyword(s):  
Experimental Approach ◽  
Homo Sapiens ◽  
Rhesus Macaques ◽  
Size Difference ◽  
Capuchin Monkeys ◽  
Size Discrimination ◽  
Sapajus Apella ◽  
Show Evidence ◽  
Human Adults ◽  
And Performance

In the Jastrow size illusion, two vertically stacked but offset stimuli of identical size are misperceived such that the bottom stimulus is overestimated relative to the top stimulus due to their spatial layout. In this study, we explored whether nonhuman primates perceive this geometric illusion in the same manner as humans. Human adults, rhesus macaques, and capuchin monkeys were presented with a computerized size discrimination task including Jastrow illusion probe trials. Consistent with previous results, humans perceived the illusory stimuli, validating the current experimental approach. Adults selected the bottom figure as larger in illusion trials with identical shapes, and performance was facilitated in trials with a true size difference when the larger figure was positioned at bottom. Monkeys performed very well in trials with a true size difference including difficult discriminations (5% difference in stimuli size), but they did not show evidence of the Jastrow illusion. They were indifferent between top and bottom stimuli in the illusory arrangement, showing no evidence of a human-like (or reversed) bias. These results are considered in light of differences in perceptual processing across primates and in comparison to previous comparative studies of the Jastrow and other size illusions.

The elusive illusion: Do children (Homo sapiens) and capuchin monkeys (Cebus apella) see the Solitaire illusion?

2016 ◽  
Vol 142 ◽  
pp. 83-95 ◽  
Author(s):  
Audrey E. Parrish ◽  
Christian Agrillo ◽  
Bonnie M. Perdue ◽  
Michael J. Beran
Keyword(s):  
Homo Sapiens ◽  
Cebus Apella ◽  
Capuchin Monkeys

How tufted capuchin monkeys (Sapajus spp.) and humans (Homo sapiens) handle a jointed tool.

2021 ◽  
Vol 135 (3) ◽  
pp. 382-393
Author(s):  
Dorothy M. Fragaszy ◽  
Joshua D. Lukemire ◽  
José Eduardo Reynoso-Cruz ◽  
Stephanie Villarreal Jordan ◽  
Spencer Sheheane ◽  
...  
Keyword(s):  
Homo Sapiens ◽  
Capuchin Monkeys ◽  
Tufted Capuchin Monkeys
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