Children as well as adults suffering with ADD have a deficit in the area of concentration. Nearly every adult with ADD has difficulty with inattention and an inability to concentrate on and important task or stimuli consistently. Blinks are a shutting down of one's attention span long enough to miss pieces of the whole picture. Like normal blinking, an ADDer's distractions are completely involuntary . They develop systems of dealing with things based on incomplete information.
Anxiety is a temporary and often limited condition.
At the successful completion of a task.