According to Dr. Boyd, which of the following changes does the human brain NOT undergo to support learning?

The human brain is a highly adaptable organ capable of undergoing various changes to support learning and improve cognitive functions. One significant way it supports learning is through changes in synaptic connectivity, where the connections between existing neurons strengthen or weaken based on experience, a process known as synaptic plasticity. This adaptability is crucial for the formation of new memories and skills.

Similarly, alterations in brain chemistry play a vital role in learning. Neurotransmitters and hormones can affect synaptic transmission and overall brain function, impacting how information is processed and stored.

Cognitive flexibility refers to the brain's ability to switch between thinking about different concepts or to think about multiple concepts simultaneously. This capacity to adapt thought processes and responses is also a reflection of learning.

In contrast, while the human brain does indeed generate new neurons in a process called neurogenesis, this typically happens in specific regions, such as the hippocampus. However, this change is not as broadly applicable or as universally accepted as the aforementioned adaptations when discussing changes that support learning. Therefore, the number of brain cells (neurons) does not typically change in a significant or straightforward way to support learning across the brain as a whole. This makes the identification of changes in the number of brain cells as the correct answer