Cognitive complexity is a psychological characteristic or psychological variable that indicates how complex or simple is the frame and perceptual skill of a person.t is used as part of one of the several variations of the viable non-empirical evaluation model GOMS (goals, operators, methods, and selection rules); in particular the GOMS/CCT methodology. Cognitive complexity can have various meanings:
Essential tremor is a nerve disorder in which tremors occur without an identifiable cause. The tremor resembles an exaggerated shaking and occurs when a person is using his or her hands but does not occur while the hands are at rest. Parkinsonâs tremors are just the opposite â noticeable shaking when at rest but no shaking when the hands are engaged.
Some of the possible common medical causes of Involuntary twitches in the hands may include: 1  Excessive caffeine intake or other caffeinated drink. 2  Excessive alcohol consumption, alcoholism, or alcohol withdrawal. 3  Stress. 4  Anxiety. 5  Fatigue. 6  Benign essential tremor. 7  Thyrotoxicosis. 8  Carbon dioxide narcosis.