What should be changed to make the following sentence true? "A theta wave is a very high amplitude pattern of brain activity that may in some cases occur in response to environmental stimuli."

The words "theta wave" should be changed to the phrase "K-complex."

Explanation:

Complex K is a type of where related to slow wave sleep. The k complex is a group of high amplitude waves that can occur spontaneously or relate to awakening relationships. That is, the K Complex is a very high amplitude pattern of brain activity that can, in some cases, occur in response to environmental stimuli.

On the other hand, Wave Theta is the state of mind where it is believed that you can create everything and change reality instantly.