Prevalence and Detection of Voice and Swallowing Disorders in Adults With and Without Alzheimer's Disease

This research study is investigating whether people with Alzheimer's disease experience more changes to voice and swallowing than their healthy age-matched peers. The prevalence of swallowing impairments in moderate-severe Alzheimer's Disease is high (85-93%) and voice is also often negatively impacted by Alzheimer's disease. The overall objective of this study is to evaluate the voice and swallowing function of adults with and without Alzheimer's disease. The investigators will also be involving the primary caregivers of individuals with Alzheimer's that are enrolled in the study to better understand the impact of voice and swallowing impairments on the primary caregivers of those with Alzheimer's Disease. Healthy adults and individuals with Alzheimer's disease will: * undergo tests of cough, voice, and swallow function * undergo tests of grip and tongue strength * complete questionnaires Caregivers of individuals with Alzheimer's disease will also complete questionnaires.