Thank you for this very informative presentation . I would like to know what are the early symptoms of primary progressive aphasia ? A symptom that will get a person to see a neurologist ? Sometimes my husband will use a wrong word. For example : Please put the ice cream back in the ( fridge ) in stead of ( freezer) It this normal for a 64 year old man with bipolar depression and anxiety. He tells me it only happens when he's depressed and struggling with anxiety and having brain fog which he has often.. He refuses to see a neurologist. He speaks fine and has no word finding difficulties. Is this phenomenon normal for his age and giving that he struggles with a psychiatric disorder ? or is it a early sign of PPA ? I would really appreciate your reply. Thank you.