Abusers
Addicts
Age
Behavior disorders
Benton Visual Retention Test
Black vs. White drug addicts
Blacks
Demographic factors
Disturbance
Drug addiction
Drug users
Education
Ethnic differences
Ethnic norms
Heroin
Heroin addiction
Intellectual functioning
Intelligence
Interference
Language
Mean
Memory
MMPI
Multiple regression
Need
Neuropsychological assessment
Norm
Norms
Performance
Personality
Personality differences
Range
Raven Progressive Matrices
Regression
SES
Standard deviation
Test