Visual categorization of surface qualities of materials by capuchin monkeys and humans

Vision Research
Chihiro Hiramatsu, Kazuo Fujita

Abstract

Visually identifying and categorizing the material composition of objects before actually interacting with them is an important skill for operating smoothly and safely in the world. This ability is assumed to have been shaped by evolution; therefore, non-human animals should share similar categorization abilities. Little is known, however, about how non-human animals do this. We tested whether tufted capuchin monkeys (Cebus apella) were able to visually categorize images that represented nine different materials (metal, ceramic, glass, stone, bark, wood, leather, fabric, and fur), and we compared their performance with that of humans. Capuchins showed excellent categorization abilities for images of fur, which is a familiar material to captive monkeys. Humans showed a tendency to confuse material categories that resembled each other visually and/or semantically. Correlation analyses on reaction time showed that both species made correct choices rapidly in selecting glossy categories like metal and ceramic compared with matte categories like fabric and stone, which contain minute patterns. Overall, our results suggest that monkeys share similar perceptual tendencies with humans in visual categorization of material images to some...Continue Reading

References

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Aug 15, 2014·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Akiko NishioHidehiko Komatsu
Dec 24, 2014·Proceedings of the National Academy of Sciences of the United States of America·Gouki OkazawaHidehiko Komatsu

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Citations

May 3, 2018·Journal of Neurophysiology·Isao YokoiHidehiko Komatsu
Aug 12, 2019·Experimental Brain Research·Yuki MorimotoTakeharu Seno
Oct 12, 2018·PloS One·Toyomi Matsuno, Kazuo Fujita

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