The Siamese are intelligent and affectionate cats, well known for their social nature.
They are sometimes described as being extroverts. They set forth a loud, low-pitched voice, sometimes referred to as a “meezer”.
They also have a great need for human companionship and often bond strongly to a single person.
They are less active at night than most cats, probably because their blue eyes lack a structure that amplifies dim light like other cats. Like blue-eyed white cats, they can also have a lesser hearing ability than other cats.
This means that being dependent on humans may be a survival trait for the ancestors of the modern day Siamese cat.