Here is a different perspective on "thoughts"
I've done some Buddhist meditation, and in that context, they talk of six "sense-doors" not five, six!
Five of them are the conventional five senses, sight, hearing, smell, taste, touch... and the teaching is to notice directly what you are sensing in each of them, and then notice that you react to what you sense by immediately liking or disliking what you have sensed.
Here's the interesting part: They consider thought to be a sense-door as well. As in your thoughts are something that just appear in your head, just like a sound appears in your ear!
Now that is something cool to think about