I have noticed recently that my husband has episodes of frequently substituting incorrect words while speaking, this will seem to occur frequently for a few days and then not occur for several days and reoccur again. As an example we were talking about an issue with his parents for over 10 minutes and at one point in the conversation he substituted “your parents” for my parents. As another example, he was talking to a friend about a family celebration, he was describing an event and was saying that we had been in the town of Rosemount and that a rental car had been provided that had Rosewood on the dashboard. Later in the conversation he talked about the doors of the car having areas of Rosemount. (he meant Rosewood) He does not seem to notice these errors although he is a person who prides himself on his vocabulary, speaking correctly, taking care to impart the correct meaning and the use of correct grammar and such. he also frequently uses incorrect names of people when speaking. There is no history of stroke or even any mild head injury. I would say this is happening more frequently.