Monkeys, it turns out, are not so different from us after all. While they may not possess the same symbolic understanding of geometric shapes as humans, their ability to recognize and match rotated triangles, rectangles, and trapezoids is remarkably similar to that of untrained human preschoolers. This finding challenges the notion that formal education is the sole determinant of our primate relatives' geometric skills, suggesting that some cognitive foundations of mathematical reasoning are shared across species.
The study, led by scientists at Carnegie Mellon University, involved a diverse group of participants: eight adult monkeys (four rhesus macaques and four olive baboons), 55 preschoolers aged 3-6 from the United States, and 77 Indigenous Tsimane' adult volunteers with minimal formal education. The researchers designed a matching task using a touchscreen, where participants had to find pairs of shapes with the same geometry, even if they were rotated or scaled differently. The task was intentionally kept simple, with minimal instruction, allowing the participants to 'figure it out' through trial and error.
The results were striking. Monkeys and young children struggled with the task, relying more on intuitive processing and having difficulty distinguishing between similar shapes. In contrast, human adults performed much better, likely due to their ability to draw on symbolic features such as symmetry, side lengths, and angles. This suggests that the stronger use of symbolic representation is learned, possibly through formal education, rather than an inherent quality of human intelligence.
What makes this particularly fascinating is the implication that abstract thought is not an all-or-none ability that suddenly appeared in humans. Instead, some of the cognitive foundations of mathematical reasoning appear to be shared across primates, with human education and culture building on these ancient biological capacities. This raises a deeper question: are we truly unique in our ability to understand geometry, or do we simply have more tools at our disposal to enhance our innate skills?
One thing that immediately stands out is the potential for further research. Scientists may need to start enrolling monkeys in geometry lessons to uncover their true potential. But this also raises ethical questions about animal welfare and the appropriate use of animals in scientific research. It's a delicate balance, and one that requires careful consideration.
From my perspective, this study highlights the importance of recognizing the shared cognitive foundations of mathematical reasoning across species. It also underscores the need for a more nuanced understanding of human intelligence, one that acknowledges the role of both innate abilities and learned skills. As we continue to explore the boundaries of human and animal cognition, we must remain mindful of the ethical implications and strive to conduct research in a responsible and compassionate manner.
