Predominantly right-handed as a child, I have since become decidedly cross-dominant. Some things, such as writing, I can only do right-handed; others, such as working a computer mouse, I can only do left-handed. This task dominance is not constant. While I am almost never ambidextrous, and some days am ambisinistrous, most of the time I can do a particular task only from one side. This "active" side for a task may change from day to day. Overall, I have tended toward increasing left-handedness and decreasing right-handedness.