Effects of Systematic Categorization Training on Cognitive Performance in Healthy Older Adults and in Adults with Traumatic Brain Injury

Table 1

Experimental design.

			Part A							Part B
	Pretests	Probe 1	Perceptual feature training; Level 1	Similarities and differences; Level 2	Probe 2	Functional categorization; Level 3	Analogies; Level 4	Abstract concepts; Level 5	Probe 3	Levels 1-3	Posttests
Group 1: young adults with TBI (treated)	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓
Group 2: young uninjured adults (treated)	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓
Group 3: older adults (treated)	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓
Group 4: older adults (untreated)	✓	✓			✓				✓	✓	✓

Note: pre/posttests include the neuropsychological assessment and the 2 tests of the categorization program. Probe 2 was inserted at about 5 weeks after the onset of treatment and probe 3 at 8 weeks for the control group.