Reliability & Validity

RELIABLITY: BRC tests (IntegNeuro™) are available in 18 different parallel versions and multiple languages (English, Dutch, German, Spanish & Hebrew) permiting an extrordinary number of retests without the influence of practice effects.

In a study specifically aimed at assessing the reliability of Brain Resource Company assessments, the results showed that across both QEEG and ERP measures, there were no significant changes from session 1 to session 2. Similarly, neuropsychological measures (IntegNeuro) were also stable across the 4 week repeat period. These data can be downloaded HERE (select save and then open from saved location).

Reliability and valdity of IntegNeuro have also been published in the International Journal of Neuroscience. This article can be downloaded here.

VALIDITY: BRC's neuropsychological tests have been validated against "gold standard tests" in the published literature and been found to correlate well. BRC's assessment protocols have been subjected to rigorous reliability and validity investigations.

The cognitive profiling results demonstrate that IntegNeuro's psychometric battery provides a highly valid method to assess individual differences and changes in cognitive function. There were strong correlations with standard paper-and-pencil measures as well as the expected differentiation of younger and older individuals. The following table shows correlations between IntegNeuro measures and the paper-and-pencil tasks for all participants.

Reliability and valdity of IntegNeuro have also been published in the International Journal of Neuroscience. This article can be downloaded here. Further reliability and validity data can be downloaded HERE (select 'SAVE' and then open document).

IntegNeuro test	Convergent validity measure	Correlation
Digit Span	Digit Span - WAIS III		.53*
Spatial Span	Spatial Span - WMS III		.63*
Finger tapping dominant	Finger Tapping Test		.55*
Finger tapping non-dominant	Finger Tapping Test		.60*
Memory recall on the learning trials	CVLT-R Learning Trials		.67*
Memory recall on the short delay	CVLT-R Short Delay		.76*
Memory recall on the delay trial	CVLT-R Long Delay Free Recall		.63*
Letter fluency	Controlled Oral Word Association		.77*
Animal fluency	Animal fluency		.76*
Spot the Word	WAIS III Full Scale IQ		.63*
Switching of attention A	Trail Making Test A		.53*
Switching of attention B	Trail Making Test B		.65*
Mazes Number of Correct Trials Number of Errors Maze Time	Rey Complex Figure Test Delay Delay Delay		-.15 -.42* -.65*
Verbal Interference	Stroop		.70*
Choice Reaction Time	Finger Tapping Dominant		-.53*
Working Memory Test	ARCPT		.55*

*Statistically significant association between the two variables

The robust reliability and validity results highlight the solidness of each element of BRC's methodology - but with the additional advantage that all the elements are brought together in the same subjects, rather than undertaken in isolation.