Autism spectrum disorder (ASD) is typically noticed in the first 3 years of life, characterized by a deficit in social behaviors and nonverbal interactions such as reduced eye contact, facial expression, and body gestures. Children also manifest with non-specific symptoms such as unusual sensory perception skills and experiences, motor clumsiness, and insomnia.
Parkinson´s disease is a relatively common neurodegenerative condition. Initial symptoms usually include tremors of one hand. As the disease progresses, other body parts may begin to show tremors; movement may become slow and difficult; balance and posture may be affected; and it may become difficult to speak without slurring.
Alzheimer's disease (AD) is a medical condition that affects an individual's cognitive functions. This disease progresses gradually and worsens over time. AD occurs when brain cells die. Cell death in the brain results in a significant decrease in nerve cell formation and connections, leading to memory loss. The development of tangles and plaque in the brain is what causes the loss of cells.