ImPACT Version 4

Administration and Interpretation Manual

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Scoring

Table of Contents

All tests are automatically scored within the software. In addition to scores that are provided for each module, composite scores, a symptom score, measures of efficiency, validity, and a Reliable Change Index (RCI) score are all calculated. Each of these are discussed below.

Module Scores#

Each module has a set of scores that are unique to that module. Scores were designed to reflect speed of performance or accuracy, which are the two primary components measured by the test. Each of the modules and the associated scores are presented below.

Word Memory
Hits (immediate)Number of correctly identified words (out of 12)
Correct distracters (immediate)The number of correctly identified distracter items (out of 12)
Learning percent correct((Hits + correct distracters)/24) X 100.
Hits (delay)Number of correctly identified words (out of 12)
Correct distracters (delay)Number of correctly identified distracter items (out of 12)
Delayed memory percent correctDelay hits + correct distracter delay items (out of 12)
Total percent correctAverage percent correct (learning percent correct + delayed percent correct/2)
Design Memory
Hits (immediate)Number of correctly identified designs (out of 12)
Correct distracters (immediate)Number of correctly identified incorrect distracter items (out of 12)
Learning percent correct((Hits + correct distracters)/24) X 100
Hits (delay)Number of correctly identified designs (out of 12)
Correct distracters (delay)Number of correctly identified distracter designs (out of 12)
Delayed memory percent correctDelay hits + correct distracter items (out of 12)
Total percent correctAverage percent correct ((learning percent correct + delayed percent correct)/2)
X’s and O’s
Total correct (memory)Measures the number of correctly identified items (total possible correct =12)
Total correct (interference)This score provides a measure of the number of correct responses on the interference test
Average correct RT (interference)Measures the average reaction time for correct responses on the interference (distracter) test
Total incorrect (interference)Measures the number of errors on the distracter test
Total incorrect RT (interference)Provides an index of the reaction time for incorrect responses on the interference test
Symbol match
Total correct (visible)Provides the number of correct matches out of 27 when the symbol number pairings are visible
Total correct RT (visible)The average reaction time for the 27 matches
Total correct (hidden)This represents the number of items correctly recalled when symbol number pairings are hidden
Total correct RT (hidden)The average reaction time for recall of the memory items
Color Match
Total correctNumber of correct matches
Average correct RTAverage reaction time for correct matches
Total commissionsNumber of incorrect for color/word matches
Average commissions RTAverage reaction time for commissions
Three Letters
Total sequence correctTotal number of letter sequences correct (out of 5)
Total letters correctTotal letters correct (out of 15)
Percent of total letters correctPercent letters correctly identified
Average time to first clickTime to initiation of first click of mouse
Average countedThe average number of numbers clicked, regardless of errors
Average counted correctlyThe average number of numbers clicked that are in correct sequence
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