Creativity is at its greatest when you allow the vocabulary you have learned to manifest into a spontaneous manner with a minimum of premeditation.
If you have to consciously think about what you are going to play, the music will not have a feeling of immediacy.
Furthermore, the intellect cannot keep pace with some of the faster tempos.
Allow your rained instincts to take over will enable you to communicate your emotions and ideas through the music, and to interact with other musicians in the group.
Examine the inner workings of the mind and learn how to make the transition from the analytical state of mind used in studying to the nonlinear state of mind used in making music.
Tap into the intuitive part of the brain.