6. Which of the following best describes the differences between the early symptoms of FTD and Alzheimer disease (AD)?

• Age of onset is generally earlier in AD than FTD.
• Memory decline is generally the first symptom of AD, whereas behavior, language, and/or movement decline are generally the first symptoms of FTD.
• Problems with gait, balance, rigidity, apraxia, or muscle weakness occur frequently in early AD, whereas movement problems are rare in early FTD.
• Language problems in FTD involve word-finding, whereas language problems in AD involve speech production, understanding word meaning, and recognizing familiar objects.