From the "Scientifically" point of view, the question of “What is Mind?” is very important. Because it deals with the very critical question of “what kind of role does human play in science?” But it is really a complicated question.
Many people agree that we scientists work on the bridge between “objectivity” and “subjectivity”, either too much “objectivity” or too much “subjectivity” is not "Scientifically". So, if we want to define Mind and mental states "Scientifically" of a person working in the certain field of science, may be not too much “objectivity” or too much “subjectivity” is the right answer.