Answer:
Meditation is simply the process of bringing awareness to your thoughts, feelings, and physical sensations. There are many different "meditation techniques," but they all have one thing in common: they all help you to become more aware of what is happening inside.
For example, Vipassana is a technique where you observe your breath, coming into your belly, and going out. You simply watch your breath as you inhale and exhale. If your mind wanders (as it most definitely will!), you notice, "aha, I am thinking about all the things I have to do today," and then you gently bring your attention back to your breath.
In this way, you become aware of your thoughts as well as your breath. And eventually, other inner phenomena will be noticed.
So, in a sense, you could say meditation involves perception. But it is a subtle perception, an inner perception. It is not involved with the five senses.