Rewards – shopping, time off, music….
Task qualities – accomplishment, self-improvement, my own work (not tasks I perceive belong to others), interesting and/or fun. I have noticed the tasks I take the longest to compete are often related to my assessment of myself. Positive assessment feels like bragging about my self, something I learned (or misinterpreted) was wrong at an early age. I can easily see the greatness in others, not so much in myself.