doctor zaffaroni, thank you for joining us. >> hi, kristin. thanks so much for having me. >> i guess, to have this conversation, we should explain what is ftd or frontotemporal dementia and how is it different from alzheimer's? >> yeah. so frontotemporal dementia or ftd is the most common early onset form of dementia striking before the age of 60, it's a progressive brain disease similar to alzheimer's disease. but unlike alzheimer's disease, that primarily affects the memory circuits of the brain early on, ftd causes changes in personality and behavior. things like disinhibition and apathy. it can cause changes in language and speech, and it can cause movement changes, it can also change, aspects of cognition, something we call executive functioning. so this is multitasking planning and inhibiting. >> is this something that's pretty common? what are the numbers. >> it's not that common of a disease. it's not nearly as common as alzheimer's disease. for example. it's less than ten and 100,000. yeah. >> okay. so given that, you know, you talked