Answer: sensation; perception; cognition
Explanation: You are strolling through a knoll, and you see a flower. Your eyes seeing the blossom is a matter of _SENSATION_. Your mind establishes that the color of the flower is yellow. This assurance made in your made in your head is a matter of _PERCEPTION_. You begin pondering how the flower will look like in a jar in your room. This process shows _COGNITION_.