Table 1.

Description of neuropsychological testing battery

Test	Cognitive Abilities
Letter Digit Substitution Test29,30	Psychomotor function relatively unaffected by intellectual ability
Concept Shifting Test31,32	Executive (frontal) function, attention, visual scanning, and mental processing speed
Stroop Color Word Test33,34	Executive (frontal) function, attention, mental speed, and mental control
Visual Verbal Learning Test35	Various aspects of verbal learning, organization, and memory
Memory Comparison Test36	Selective attention, mental concentration, memory, and information processing
Categoric Word Fluency37	Frontal dysfunction and flexibility of verbal thought processes