In common language, the terms sensation and perception are often used interchangeably. In medicine, the words actually have distinct meanings. Sensation occurs when you see, feel, hear, smell, or touch something using one of the five major senses. Perception occurs when your brain gets involved, and you assimilate what you sense into an experience.
For example, you may touch a sweater (sensation) or experience the rich texture of its fine wool (perception).
In my day job, I study and offer opinions regarding the nuances of subtleties all day long