Meditation lecture, Charles Tart - pioneer researcher of consciousness

Reflections on Meditation by Charles T. Tart (9 videos total, approx 10 min each)
Here's the links to the first three. The more interesting info begins in Part 3. You can easily locate Parts 4 - 9 at youtube after watching any of the following links:

(Part 1, introduction)

(Part 2, Introduction continued, then begins to get into lecture)

(Part 3, lecture begins to get into more substantial points)

Psychologist Charles T. Tart of the Institute of Transpersonal Psychology and the University of California (Davis) reflects on the nature of meditation, what it does, how to make it more effective, how to understand it. Tart is a pioneer in the study of consciousness, having published such classic books as his "Altered States of Consciousness" and "Transpersonal Psychologies." Articles of his are available at www.paradigm-sys.com/cttart/

[edit: added URL links to Part 2 & 3]