HeadMinder Normative Samples & Demographics
HeadMinder has gathered normative data on three independent groups from a geographically and ethnically diverse U.S. sample aged 13 to 90. The sample was balanced to ensure adequate representation of persons with lower education and less computer familiarity. All participants were administered up to four tests at varying retest schedules over approximately two years. Data pertaining to retest effects and the effects of demographic variables on test performance can be provided upon request. HeadMinder supports the use of both the Reliable Change Index (RCI) and Standardized Regression Based (SRB) methods for reliable change calculations.

Validation with Healthy and Clinical Populations
HeadMinder tests have been extensively validated with both healthy and clinical populations. Validation efforts have supported the use of the tests as single-use screenings and as longitudinal measurement instruments.

•	An examination of normative data by age reveals expected age-performance relationships, and correlations between HeadMinder tests and traditional paper-and-pencil tests are as expected.
•	HeadMinder factors yield patterns consistent with diagnosis-based criteria at first administration, and HeadMinder tests record patterns of change at second administration consistent with expected clinical course.
•	Extensive validation efforts have ensured that the measures are stable - that test instructions and the computer interface are clear, and that computer anxiety does not interfere with accurate collection of data.
•	HeadMinder tests have administration success rates of more than 98% with many patient populations.
•	HeadMinder tests have demonstrated high reliability with many diagnostic groups including early-stage Alzheimer's disease, Multiple Sclerosis, non-primary CNS Cancer, AD/HD, Schizophrenia, and HIV.

Test-Retest Reliability
HeadMinder factors are stable across test instances. Test-retest reliability coefficients range from .68 to .94. In addition, HeadMinder tests have demonstrated equal or improved reliability with many diagnostic groups, including early-stage Alzheimer's disease, Multiple Sclerosis, non-primary CNS Cancer, AD/HD, Schizophrenia, and HIV. (Erlanger, Kaushik, Broshek, et al., 2002, Journal of Head Trauma Rehabilitation)

Concurrent Validity
HeadMinder factors have been shown to be similar to corresponding traditional measures, including the Controlled Oral Word Association Test, Stroop test, Trail Making A & B, Symbol Digit Modalities Test, Symbol Search, WMS-III Logical Memory & Visual Reproduction, Buschke Selective Reminding Test, Digit Span, WASI Matrix Reasoning, and the Grooved Pegboard Test. (Erlanger, Kaushik, Broshek, et al., 2002, Journal of Head Trauma Rehabilitation; Erlanger, Feldman, Kutner, et al., 2003, Archives of Clinical Neuropsychology)

For validation data on healthy and clinical groups, click here.