‘Oddball’ test lets us glimpse how monkeys see the world
Compared with humans, macaques are more likely to miss the bigger picture, but are also less confused by flipped images
To uncover how monkeys perceive the world, Indian neuroscientists employed the "oddball" test, comparing visual performances between humans and macaques. Although both species scored similarly on many aspects of perception, two intriguing differences were observed: monkeys were less phased by images being flipped upside down, and they showed a stronger focus on fine details.
This test, previously requiring extensive training, was simplified by using just one task—an oddball search task where subjects identify the outlier in a set of images. Both humans and monkeys performed similarly in tasks involving categorizing inanimate and animate objects, as well as adhering to Weber’s law regarding the smallest noticeable changes in stimuli.
However, monkeys stood out in their immunity to "mirror confusion," a phenomenon where people find it harder to differentiate mirror images flipped across a vertical axis compared to a horizontal one, likely due to their frequent experience with objects at various angles. Conversely, monkeys excelled in detecting small features yet displayed indifference to larger shapes, indicating a unique visual perception aligned with their agile lifestyle.
These findings, presented in New Scientist's Last Word series, not only shed light on monkey vision but also prompt broader inquiries into the limits of assuming shared visual experiences between humans and other primates.
Written by urgent.news from New Scientist's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
