and cognitive processes
can be used interchangeably to mean such functions or processes as perception, introspection, memory, imagination, conception, belief, reasoning, volition, and emotion--in other words, all the different things that we can do with our minds. The event of perceiving City Hall is, of course, different from the entire process, or faculty, of perception--one's ability to perceive things. In other words, in instance of perceiving is different from the ability that makes it possible.
Whenever one engage in one a cognitive processes, a MentalEvent occurs.