4.At six months of age,Byme underwent the surgical removal of the entire left hemisphere of her brain. Which of the following concepts explains the recovery of her primary functions following such surgery? (A) Brain plasticity (B)Contralateral function (C) Motor neurons (D) Activation-synthesis

## Step 1<br />The problem presents a scenario where a person, Byrne, undergoes a surgical procedure that involves the removal of the entire left hemisphere of her brain. The question asks us to identify the concept that explains the recovery of her primary functions following such surgery.<br /><br />## Step 2<br />Let's analyze each option:<br /><br />(A) Brain plasticity: This concept refers to the brain's ability to adapt to changes and reorganize its functions in response to new learning experiences or following injury. This concept is relevant to the scenario as it explains how the brain can recover and adapt after a significant part of it is removed.<br /><br />(B) Contralateral function: This term refers to the control of bodily functions by the opposite side of the brain. While this concept is related to the brain's control of bodily functions, it does not directly explain the recovery of primary functions following the removal of a hemisphere.<br /><br />(C) Motor neurons: These are nerve cells that transmit signals from the brain to the muscles, enabling movement. While motor neurons are crucial for movement, they do not explain the brain's ability to recover and adapt after a significant part of it is removed.<br /><br />(D) Activation-synthesis: This is a theory about dreaming, suggesting that dreams are the brain's attempt to make sense of random neural activity. This concept is not related to the brain's ability to recover and adapt after a significant part of it is removed.<br /><br />## Step 3<br />Based on the analysis, the concept that best explains the recovery of primary functions following the removal of a hemisphere is brain plasticity.