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American Focus > Blog > Tech and Science > Our big brains may have evolved because of placental sex hormones
Tech and Science

Our big brains may have evolved because of placental sex hormones

Last updated: June 19, 2025 8:35 pm
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Our big brains may have evolved because of placental sex hormones
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The human brain is a marvel of evolution, and recent research suggests that hormones from the placenta during pregnancy may have played a key role in shaping its complexity. While the social brain hypothesis has long been proposed as an explanation for the evolution of large brains in humans, the biological mechanisms behind this theory have remained elusive.

A study conducted by Alex Tsompanidis and his team at the University of Cambridge explores the role of placental sex hormones in brain development. The placenta, an essential organ during pregnancy, produces hormones such as oestrogens and androgens that are crucial for fetal development. These hormones have been linked to various aspects of brain development, including language and social skills.

Recent research has shown that administering androgens like testosterone to brain organoids can increase the number of cells in the cortex, a brain region important for cognitive functions. Additionally, oestrogens have been found to play a role in forming connections between neurons in the brain. Studies have also shown that humans may be exposed to higher levels of these hormones during pregnancy compared to non-human primates.

The higher levels of these hormones in humans could explain why we form large social groups. Differences in hormone levels between male and female humans may contribute to the subtle distinctions between the sexes, leading to more interconnected brains and facilitating social interactions. This interconnectedness could have been a driving force behind the evolution of larger brains in humans.

While placental genes undoubtedly play a role in brain development and evolution, some researchers believe that factors like male-male competition also influenced cognitive evolution. Greater cooperation and reduced aggression among male humans within the same social group may have evolved as a response to between-group conflicts.

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Research on placental differences between primates is challenging due to practices like placental consumption in non-human primates. However, understanding the factors that shaped human brain evolution is crucial not just for intellectual curiosity but also for gaining insights into neurodiversity. By studying how the brain evolved, we may uncover whether certain cognitive traits come with trade-offs.

In conclusion, the intricate relationship between placental hormones and brain development sheds light on the remarkable complexity of the human brain and provides valuable insights into our evolutionary history. Further research in this field could pave the way for a deeper understanding of the diversity of cognitive abilities among individuals. The world is constantly changing, and technology is at the forefront of this evolution. From smartphones to artificial intelligence, the way we live, work, and communicate is being transformed by the latest innovations. One area that has seen remarkable development in recent years is the field of virtual reality (VR).

Virtual reality is a computer-generated simulation of a three-dimensional environment that can be interacted with in a seemingly real or physical way by a person using special electronic equipment, such as a headset. This technology has been around for decades, but recent advancements have made VR more immersive and accessible than ever before.

One of the most significant developments in VR technology is the introduction of standalone headsets, which do not require a computer or smartphone to function. These all-in-one devices have made VR more portable and user-friendly, opening up new possibilities for applications beyond gaming and entertainment.

For example, VR is now being used in healthcare to train medical students and simulate surgeries, in education to provide immersive learning experiences, and in architecture and design to create virtual prototypes of buildings and products. VR is also being used in therapy to treat phobias and post-traumatic stress disorder, and in rehabilitation to help patients regain mobility and independence.

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In the entertainment industry, VR has revolutionized the way we experience movies, concerts, and video games. With VR headsets, users can feel like they are part of the action, whether they are exploring a virtual world, attending a live concert, or playing a game with friends in a virtual space.

But the potential of VR goes beyond entertainment and education. Businesses are also using VR to enhance customer experiences, improve training programs, and streamline operations. For example, retail stores are using VR to create virtual showrooms where customers can try on clothes and accessories before making a purchase, while car manufacturers are using VR to design and test new models before they are built.

As VR technology continues to evolve, we can expect to see even more innovative applications in a wide range of industries. From healthcare to entertainment, education to business, VR has the potential to revolutionize how we work, play, and connect with each other. The future of virtual reality is exciting, and the possibilities are endless.

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