Table 1.

Neuropsychological tests and corresponding cognitive domains

Cognitive domain	Content
Executive functioning	Categoric Word Fluency Task21
	Measures executive functioning and semantic memory. Outcome variable: number of animals in 60 seconds
	Concept Shifting Test25
	Measures attention, visual search, mental processing speed, and ability to mentally control simultaneous stimulus patterns. Outcome variables: CST A, CST B, CST C.
Processing speed	Concept Shifting Test25
	Outcome variable: CST 0
	Letter Digit Substitution Test24
	Measures psychomotor speed that is relatively unaffected by a decline in intellectual ability. Outcome variable: LDST Delta (ie, number of substitutions read minus number of substitutions written).
Verbal memory	Visual Verbal Learning Test23
	Examines verbal learning capacity and consolidation of verbal information into long-term memory. Outcome variables: Trial 1, delayed recall, delayed recognition, and difference between maximum score and trials 1, total score trial 1-5)
Working memory	Memory Scanning Test26
	Measures the speed and efficiency of memory retrieval processes. Outcome variables/items to be stored in working memory: symbol ‘%’, 1, 2, 3, and 4 letters, successively.
Information processing	Letter Digit Substitution Test24
	Outcome variables: number of substitutions read and written.
Attention	Stroop Color Word Test22
	Examines information processing speed, selective attention, and mental control.
	Outcome variables: Stroop card I, Stroop card II, Stroop card III.