<qa>  What is the primary objective of this non-significant risk study?This is a non-blinded study in subjects who present to the UCSF Memory and Aging Clinic MAC with neurodegenerative disease and cognitive dysfunction. The primary objective of this non-significant risk study is signature development. The goal is to develop a signal algorithm using the Nautilus NeuroWaveTM for dementia. This is accomplished by analyzing and processing Nautilus NeuroWave recordings from a patient with confirmed dementia. All subjects will be enrolled until recordings are obtained from at least 10 of each of the following subject cohorts: Moderate or Severe Frontotemporal Lobar Degeneration FTDL, Alzheimers Disease, Mild Cognitive Impairment MCI and Age Matched Normal Controls. 