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In September 2026, a significant scientific achievement was announced by researchers in the United States. Neuroscientists have successfully developed laboratory mice that possess functioning human cells within their brains. While the concept of a hybrid creature might initially appear to belong in a science fiction novel, the researchers involved have been quick to clarify that these animals do not possess human consciousness or thought patterns. Instead, the primary objective of this intricate project is to assist medical professionals in understanding complex psychiatric and neurodevelopmental conditions.

Many diseases, including autism, epilepsy, and cerebral palsy, are unique to the human brain. Historically, it has been challenging to study these conditions effectively because traditional animal models do not accurately replicate the specific characteristics of human biology. To address this, the mice were genetically engineered to lack a significant portion of their own cerebral cortex, which is the outer layer of the brain responsible for higher-level functions. This gap allowed scientists to introduce human neurons into the mice, creating a living environment where human brain cells can connect and grow naturally.

Professor Sergiu Pasca of Stanford University, who led the study, pointed out that psychiatry currently has some of the lowest success rates in clinical trials. A drug may perform exceptionally well in standard laboratory animals but fail to show any benefit when tested on human patients. This discrepancy suggests that researchers have lacked vital information about our own biology. By utilizing these new models, the scientific community hopes to bridge this gap, which could prove transformative for medical science.

The study, published in the prestigious journal Nature, was conducted under strict ethical scrutiny to ensure the research remained responsible. Although the project raises complex questions regarding the ethics of altering animals, the potential to discover treatments for previously untreatable brain disorders represents a major milestone. By capturing aspects of human brain function that were previously impossible to observe, this technology provides a new path for medical research. Ultimately, the scientific community must weigh the ethical risks against the life-saving benefits this breakthrough might offer.

1. What is the primary purpose of the research involving human cells in mice?

• A.To create animals that can think like human beings.
• B.To study how human brain cells function in a living environment.
• C.To prove that science fiction can become a reality.
• D.To replace all traditional laboratory animals with hybrid models.

2. According to the article, why were the mice genetically altered to lack a cerebral cortex?

• A.To make the mice less aggressive during the experiment.
• B.To prevent the mice from developing their own intelligence.
• C.To provide space for human neurons to grow and connect.
• D.To ensure the mice could survive the surgery.

3. What does Professor Pasca suggest is a major problem in modern psychiatry?

• A.There are not enough volunteers for clinical trials.
• B.Standard animal tests do not always predict how humans will react to drugs.
• C.Scientists are focusing on the wrong types of brain diseases.
• D.The technology used in laboratories is too outdated for modern medicine.

4. What is the author’s tone regarding the ethical concerns of this research?

• A.Dismissive, suggesting that ethics are not important in science.
• B.Highly critical, arguing that the project should be stopped immediately.
• C.Balanced, acknowledging the controversy while noting the potential benefits.
• D.Sarcastic, mocking the concerns of those who worry about animal rights.

5. In the third paragraph, what does the word ‘transformative’ most likely mean?

• A.Causing a major and positive change.
• B.Something that is very expensive to complete.
• C.A process that takes a long time to finish.
• D.An experiment that is difficult to understand.